Class: Magick::Image

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/rmagick_internal.rb,
ext/RMagick/rmmain.cpp

Overview

Ruby-level Magick::Image methods

Defined Under Namespace

Classes: DrawOptions, Info, PolaroidOptions, View

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cols, rows, fill = nil) ⇒ Magick::Image

Initialize a new Image object If the fill argument is omitted, fill with background color.

Returns self.

Parameters:

  • cols (Numeric) —

    the image width

  • rows (Numeric) —

    the image height

  • fill (Magick::HatchFill, Magick::SolidFill) (defaults to: nil) —

    if object is given as fill argument, background color will be filled using it.



9875
9876
9877
9878
9879
9880
9881
9882
9883
9884
9885
9886
9887
9888
9889
9890
9891
9892
9893
9894
9895
9896
9897
9898
9899
9900
9901
9902
9903
9904
9905
9906
9907
9908
9909
9910
9911
9912
9913
9914
9915
9916
9917
9918
9919
9920
9921
9922
9923
9924
9925
9926
9927
9928
9929
9930
9931
9932
9933
9934
9935
9936
9937
9938
9939
9940
9941
9942
9943
9944
9945
9946
9947
9948
9949
9950
9951
9952
 
# File 'ext/RMagick/rmimage.cpp', line 9875

VALUE
Image_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE fill = Qnil;
    Info *info;
    VALUE info_obj;
    Image *image;
    unsigned long cols, rows;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    switch (argc)
    {
        case 3:
            fill = argv[2];
        case 2:
            rows = NUM2ULONG(argv[1]);
            cols = NUM2ULONG(argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    // Create a new Info object to use when creating this image.
    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

    image = rm_acquire_image(info);
    if (!image)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    rm_set_user_artifact(image, info);

    // NOW store a real image in the image object.
    UPDATE_DATA_PTR(self, image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageExtent) args = { image, cols, rows, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageExtent), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageExtent) args = { image, cols, rows };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageExtent), &args);
#endif

    // If the caller did not supply a fill argument, call SetImageBackgroundColor
    // to fill the image using the background color. The background color can
    // be set by specifying it when creating the Info parm block.
    if (NIL_P(fill))
    {
#if defined(IMAGEMAGICK_7)
        exception = AcquireExceptionInfo();
        GVL_STRUCT_TYPE(SetImageBackgroundColor) args = { image, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args);
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);
#else
        GVL_STRUCT_TYPE(SetImageBackgroundColor) args = { image };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args);
#endif
    }
    // fillobj.fill(self)
    else
    {
        rb_funcall(fill, rm_ID_fill, 1, self);
    }

    RB_GC_GUARD(fill);
    RB_GC_GUARD(info_obj);

    return self;
}

Class Method Details

._load(str) ⇒ Magic::Image

Implement marshalling.

Parameters:

  • str (String) —

    the marshalled string

Returns:

  • (Magic::Image) —

    a new image

See Also:



8894
8895
8896
8897
8898
8899
8900
8901
8902
8903
8904
8905
8906
8907
8908
8909
8910
8911
8912
8913
8914
8915
8916
8917
8918
8919
8920
8921
8922
8923
8924
8925
8926
8927
8928
8929
8930
8931
8932
8933
8934
8935
8936
8937
8938
8939
8940
8941
8942
8943
8944
8945
8946
8947
8948
8949
8950
8951
8952
8953
8954
8955
 
# File 'ext/RMagick/rmimage.cpp', line 8894

VALUE
Image__load(VALUE klass ATTRIBUTE_UNUSED, VALUE str)
{
    Image *image;
    ImageInfo *info;
    DumpedImage mi;
    ExceptionInfo *exception;
    char *blob;
    size_t length;

    blob = rm_str2cstr(str, &length);

    // Must be as least as big as the 1st 4 fields in DumpedImage
    if (length <= (long)(sizeof(DumpedImage)-MaxTextExtent))
    {
        rb_raise(rb_eTypeError, "image is invalid or corrupted (too short)");
    }

    // Retrieve & validate the image format from the header portion
    mi.id = ((DumpedImage *)blob)->id;
    if (mi.id != DUMPED_IMAGE_ID)
    {
        rb_raise(rb_eTypeError, "image is invalid or corrupted (invalid header)");
    }

    mi.mj = ((DumpedImage *)blob)->mj;
    mi.mi = ((DumpedImage *)blob)->mi;
    if (   mi.mj != DUMPED_IMAGE_MAJOR_VERS
           || mi.mi > DUMPED_IMAGE_MINOR_VERS)
    {
        rb_raise(rb_eTypeError, "incompatible image format (can't be read)\n"
                 "\tformat version %d.%d required; %d.%d given",
                 DUMPED_IMAGE_MAJOR_VERS, DUMPED_IMAGE_MINOR_VERS,
                 mi.mj, mi.mi);
    }

    mi.len = ((DumpedImage *)blob)->len;

    // Must be bigger than the header
    if (length <= (mi.len + sizeof(DumpedImage) - MaxTextExtent))
    {
        rb_raise(rb_eTypeError, "image is invalid or corrupted (too short)");
    }

    info = CloneImageInfo(NULL);

    memcpy(info->magick, ((DumpedImage *)blob)->magick, mi.len);
    info->magick[mi.len] = '\0';

    exception = AcquireExceptionInfo();

    blob += offsetof(DumpedImage, magick) + mi.len;
    length -= offsetof(DumpedImage, magick) + mi.len;
    GVL_STRUCT_TYPE(BlobToImage) args = { info, blob, (size_t)length, exception };
    image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlobToImage), &args);
    DestroyImageInfo(info);

    rm_check_exception(exception, image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(image);
}

.capture(silent = false, frame = false, descend = false, screen = false, borders = false) ⇒ Magick::Image .capture(silent = false, frame = false, descend = false, screen = false, borders = false) {|Magick::Image::Info| ... } ⇒ Magick::Image

Reads an image from an X window. Unless you identify a window to capture via the optional arguments block, when capture is invoked the cursor will turn into a cross. Click the cursor on the window to be captured.

Examples:

img = Image.capture { |options|
  options.filename = "root"
}

Overloads:

  • .capture(silent = false, frame = false, descend = false, screen = false, borders = false) ⇒ Magick::Image

    Parameters:

    • silent (Boolean) (defaults to: false) —

      If true, suppress the beeps that signal the start and finish of the capture process.

    • frame (Boolean) (defaults to: false) —

      If true, include the window frame.

    • descend (Boolean) (defaults to: false) —

      If true, obtain image by descending window hierarchy.

    • screen (Boolean) (defaults to: false) —

      If true, specifies that the GetImage request used to obtain the image should be done on the root window, rather than directly on the specified window. In this way, you can obtain pieces of other windows that overlap the specified window, and more importantly, you can capture menus or other popups that are independent windows but appear over the specified window.

    • borders (Boolean) (defaults to: false) —

      If true, include the border in the image.

  • .capture(silent = false, frame = false, descend = false, screen = false, borders = false) {|Magick::Image::Info| ... } ⇒ Magick::Image

    This yields Info to block with its object’s scope.

    Parameters:

    • silent (Boolean) (defaults to: false) —

      If true, suppress the beeps that signal the start and finish of the capture process.

    • frame (Boolean) (defaults to: false) —

      If true, include the window frame.

    • descend (Boolean) (defaults to: false) —

      If true, obtain image by descending window hierarchy.

    • screen (Boolean) (defaults to: false) —

      If true, specifies that the GetImage request used to obtain the image should be done on the root window, rather than directly on the specified window. In this way, you can obtain pieces of other windows that overlap the specified window, and more importantly, you can capture menus or other popups that are independent windows but appear over the specified window.

    • borders (Boolean) (defaults to: false) —

      If true, include the border in the image.

    Yields:

Returns:



2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
 
# File 'ext/RMagick/rmimage.cpp', line 2275

VALUE
Image_capture(int argc, VALUE *argv, VALUE self ATTRIBUTE_UNUSED)
{
    Image *new_image;
    ImageInfo *image_info;
    VALUE info_obj;
    XImportInfo ximage_info;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    XGetImportInfo(&ximage_info);
    switch (argc)
    {
        case 5:
            ximage_info.borders = (MagickBooleanType)RTEST(argv[4]);
        case 4:
            ximage_info.screen  = (MagickBooleanType)RTEST(argv[3]);
        case 3:
            ximage_info.descend = (MagickBooleanType)RTEST(argv[2]);
        case 2:
            ximage_info.frame   = (MagickBooleanType)RTEST(argv[1]);
        case 1:
            ximage_info.silent  = (MagickBooleanType)RTEST(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
            break;
    }

    // Get optional parms.
    // Set info->filename = "root", window ID number or window name,
    //  or nothing to do an interactive capture
    // Set info->server_name to the server name
    // Also info->colorspace, depth, dither, interlace, type
    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, image_info);

    // If an error occurs, IM will call our error handler and we raise an exception.
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    new_image = XImportImage(image_info, &ximage_info, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    new_image = XImportImage(image_info, &ximage_info);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    rm_ensure_result(new_image);

    rm_set_user_artifact(new_image, image_info);

    RB_GC_GUARD(info_obj);

    return rm_image_new(new_image);
}

.constitute(width_arg, height_arg, map_arg, pixels_arg) ⇒ Magick::Image

Creates an Image from the supplied pixel data. The pixel data must be in scanline order, top-to-bottom. The pixel data is an array of either all Fixed or all Float elements. If Fixed, the elements must be in the range [0..QuantumRange]. If Float, the elements must be normalized [0..1]. The “map” argument reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, or I = intensity (for grayscale).

The pixel array must have width X height X strlen(map) elements.

Parameters:

  • width_arg (Numeric) —

    The number of columns in the image

  • height_arg (Numeric) —

    The number of rows in the image

  • map_arg (String) —

    A string describing the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, or I = intensity (for grayscale).

  • pixels_arg (Array<Magick::Pixel>) —

    The pixel data in the array must be stored in scanline order, left-to-right and top-to-bottom. The elements in the array must be either all Integers or all Floats. If the elements are Integers, the Integers must be in the range [0..QuantumRange]. If the elements are Floats, they must be in the range [0..1].

Returns:



4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
 
# File 'ext/RMagick/rmimage.cpp', line 4352

VALUE
Image_constitute(VALUE klass ATTRIBUTE_UNUSED, VALUE width_arg, VALUE height_arg,
                 VALUE map_arg, VALUE pixels_arg)
{
    Image *new_image;
    VALUE pixel, pixel0;
    long x, npixels;
    size_t width, height, map_l;
    char *map;
    volatile union
    {
        double *f;
        Quantum *i;
        void *v;
    } pixels;
    VALUE pixel_class;
    StorageType stg_type;
    ExceptionInfo *exception;

    // rb_Array converts objects that are not Arrays to Arrays if possible,
    // and raises TypeError if it can't.
    pixels_arg = rb_Array(pixels_arg);

    if (NUM2LONG(width_arg) <= 0 || NUM2LONG(height_arg) <= 0)
    {
        rb_raise(rb_eArgError, "width and height must be greater than zero");
    }

    width = NUM2LONG(width_arg);
    height = NUM2LONG(height_arg);
    map = rm_str2cstr(map_arg, &map_l);

    npixels = width * height * map_l;
    if (RARRAY_LEN(pixels_arg) != npixels)
    {
        rb_raise(rb_eArgError, "wrong number of array elements (%ld for %ld)",
                 RARRAY_LEN(pixels_arg), npixels);
    }

    // Inspect the first element in the pixels array to determine the expected
    // type of all the elements. Allocate the pixel buffer.
    pixel0 = rb_ary_entry(pixels_arg, 0);
    if (rb_obj_is_kind_of(pixel0, rb_cFloat) == Qtrue)
    {
        pixels.f = ALLOC_N(double, npixels);
        stg_type = DoublePixel;
        pixel_class = rb_cFloat;
    }
    else if (rb_obj_is_kind_of(pixel0, rb_cInteger) == Qtrue)
    {
        pixels.i = ALLOC_N(Quantum, npixels);
        stg_type = QuantumPixel;
        pixel_class = rb_cInteger;
    }
    else
    {
        rb_raise(rb_eTypeError, "element 0 in pixel array is %s, must be numeric",
                 rb_class2name(CLASS_OF(pixel0)));
    }



    // Convert the array elements to the appropriate C type, store in pixel
    // buffer.
    for (x = 0; x < npixels; x++)
    {
        pixel = rb_ary_entry(pixels_arg, x);
        if (rb_obj_is_kind_of(pixel, pixel_class) != Qtrue)
        {
            xfree(pixels.v);
            rb_raise(rb_eTypeError, "element %ld in pixel array is %s, expected %s",
                     x, rb_class2name(CLASS_OF(pixel)), rb_class2name(CLASS_OF(pixel0)));
        }
        if (pixel_class == rb_cFloat)
        {
            pixels.f[x] = (float) NUM2DBL(pixel);
            if (pixels.f[x] < 0.0 || pixels.f[x] > 1.0)
            {
                xfree(pixels.v);
                rb_raise(rb_eArgError, "element %ld is out of range [0..1]: %f", x, pixels.f[x]);
            }
        }
        else
        {
            pixels.i[x] = NUM2QUANTUM(pixel);
        }
    }

    // This is based on ConstituteImage in IM 5.5.7
    new_image = rm_acquire_image((ImageInfo *) NULL);
    if (!new_image)
    {
        xfree(pixels.v);
        rb_raise(rb_eNoMemError, "not enough memory to continue.");
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageExtent) args_SetImageExtent = { new_image, width, height, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageExtent), &args_SetImageExtent);
#else
    GVL_STRUCT_TYPE(SetImageExtent) args_SetImageExtent = { new_image, width, height };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageExtent), &args_SetImageExtent);
    exception = &new_image->exception;
#endif

    if (rm_should_raise_exception(exception, RetainExceptionRetention))
    {
        xfree(pixels.v);
#if defined(IMAGEMAGICK_7)
        DestroyImage(new_image);
        rm_raise_exception(exception);
#else
        rm_check_image_exception(new_image, DestroyOnError);
#endif
    }

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(SetImageBackgroundColor) args_SetImageBackgroundColor = { new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args_SetImageBackgroundColor);
#else
    GVL_STRUCT_TYPE(SetImageBackgroundColor) args_SetImageBackgroundColor = { new_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args_SetImageBackgroundColor);
    exception = &new_image->exception;
#endif

    if (rm_should_raise_exception(exception, RetainExceptionRetention))
    {
        xfree(pixels.v);
#if defined(IMAGEMAGICK_7)
        DestroyImage(new_image);
        rm_raise_exception(exception);
#else
        rm_check_image_exception(new_image, DestroyOnError);
#endif
    }

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(ImportImagePixels) args_ImportImagePixels = { new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImportImagePixels), &args_ImportImagePixels);
    xfree(pixels.v);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ImportImagePixels) args_ImportImagePixels = { new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImportImagePixels), &args_ImportImagePixels);
    xfree(pixels.v);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    RB_GC_GUARD(pixel);
    RB_GC_GUARD(pixel0);
    RB_GC_GUARD(pixel_class);

    return rm_image_new(new_image);
}

.from_blob(blob) ⇒ Array<Magick::Image> .from_blob(blob) {|Magick::Image::Info| ... } ⇒ Array<Magick::Image>

Convert direct to memory image formats from string data.

Overloads:

  • .from_blob(blob) ⇒ Array<Magick::Image>

    Parameters:

    • blob (String) —

      the blob data

  • .from_blob(blob) {|Magick::Image::Info| ... } ⇒ Array<Magick::Image>

    This yields Info to block with its object’s scope.

    Parameters:

    • blob (String) —

      the blob data

    Yields:

Returns:

See Also:



7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
 
# File 'ext/RMagick/rmimage.cpp', line 7281

VALUE
Image_from_blob(VALUE klass ATTRIBUTE_UNUSED, VALUE blob_arg)
{
    Image *images;
    Info *info;
    VALUE info_obj;
    ExceptionInfo *exception;
    void *blob;
    size_t length;

    blob = (void *) rm_str2cstr(blob_arg, &length);

    // Get a new Info object - run the parm block if supplied
    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(BlobToImage) args = { info,  blob, (size_t)length, exception };
    images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlobToImage), &args);
    rm_check_exception(exception, images, DestroyOnError);

    DestroyExceptionInfo(exception);

    rm_ensure_result(images);
    rm_set_user_artifact(images, info);

    RB_GC_GUARD(info_obj);

    return array_from_images(images);
}

.ping(file_arg) ⇒ Array<Magick::Image>

Returns all the properties of an image or image sequence except for the pixels.

Returns:

  • (Array<Magick::Image>) —

    an array of 1 or more new image objects (without pixel data)

See Also:



10582
10583
10584
10585
10586
 
# File 'ext/RMagick/rmimage.cpp', line 10582

VALUE
Image_ping(VALUE klass, VALUE file_arg)
{
    return rd_image(klass, file_arg, GVL_FUNC(PingImage));
}

.read(file_arg) ⇒ Array<Magick::Image>

Call ReadImage.

Parameters:

  • file_arg (File, String) —

    the file containing image data or file name

Returns:

  • (Array<Magick::Image>) —

    an array of 1 or more new image objects



11502
11503
11504
11505
11506
 
# File 'ext/RMagick/rmimage.cpp', line 11502

VALUE
Image_read(VALUE klass, VALUE file_arg)
{
    return rd_image(klass, file_arg, GVL_FUNC(ReadImage));
}

.read_inline(content) ⇒ Array<Magick::Image>

Read a Base64-encoded image.

Parameters:

  • content (String) —

    the content

Returns:



11709
11710
11711
11712
11713
11714
11715
11716
11717
11718
11719
11720
11721
11722
11723
11724
11725
11726
11727
11728
11729
11730
11731
11732
11733
11734
11735
11736
11737
11738
11739
11740
11741
11742
11743
11744
11745
11746
11747
11748
11749
11750
11751
11752
11753
11754
11755
11756
11757
11758
11759
11760
11761
11762
11763
11764
 
# File 'ext/RMagick/rmimage.cpp', line 11709

VALUE
Image_read_inline(VALUE self ATTRIBUTE_UNUSED, VALUE content)
{
    VALUE info_obj;
    Image *images;
    ImageInfo *info;
    char *image_data;
    size_t x, image_data_l;
    unsigned char *blob;
    size_t blob_l;
    ExceptionInfo *exception;

    image_data = rm_str2cstr(content, &image_data_l);

    // Search for a comma. If found, we'll set the start of the
    // image data just following the comma. Otherwise we'll assume
    // the image data starts with the first byte.
    for (x = 0; x < image_data_l; x++)
    {
        if (image_data[x] == ',')
        {
            break;
        }
    }
    if (x < image_data_l)
    {
        image_data += x + 1;
    }

    GVL_STRUCT_TYPE(Base64Decode) args_Base64Decode = { image_data, &blob_l };
    blob = (unsigned char *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(Base64Decode), &args_Base64Decode);
    if (blob_l == 0)
    {
        rb_raise(rb_eArgError, "can't decode image");
    }

    exception = AcquireExceptionInfo();

    // Create a new Info structure for this read. About the
    // only useful attribute that can be set is `format'.
    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

    GVL_STRUCT_TYPE(BlobToImage) args_BlobToImage = { info, blob, blob_l, exception };
    images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlobToImage), &args_BlobToImage);
    magick_free((void *)blob);

    rm_check_exception(exception, images, DestroyOnError);

    DestroyExceptionInfo(exception);
    rm_set_user_artifact(images, info);

    RB_GC_GUARD(info_obj);

    return array_from_images(images);
}

Instance Method Details

#<=>(other) ⇒ -1, ...

Compare two images.

Parameters:

  • other (Object) —

    other image

Returns:

  • (-1, 0, 1, nil) —

    the result of compare



13370
13371
13372
13373
13374
13375
13376
13377
13378
13379
13380
13381
13382
13383
13384
13385
13386
13387
13388
13389
13390
13391
13392
13393
13394
13395
13396
13397
13398
13399
13400
13401
13402
13403
13404
13405
13406
13407
13408
13409
13410
13411
13412
13413
13414
13415
13416
 
# File 'ext/RMagick/rmimage.cpp', line 13370

VALUE
Image_spaceship(VALUE self, VALUE other)
{
    Image *imageA, *imageB;
    const char *sigA, *sigB;
    int res;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    imageA = rm_check_destroyed(self);

    // If the other object isn't a Image object, then they can't be equal.
    if (!rb_obj_is_kind_of(other, Class_Image))
    {
        return Qnil;
    }

    imageB = rm_check_destroyed(other);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SignatureImage) args1 = { imageA, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args1);
    CHECK_EXCEPTION();
    GVL_STRUCT_TYPE(SignatureImage) args2 = { imageB, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args2);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SignatureImage) args1 = { imageA };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args1);
    GVL_STRUCT_TYPE(SignatureImage) args2 = { imageB };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args2);
#endif
    sigA = rm_get_property(imageA, "signature");
    sigB = rm_get_property(imageB, "signature");
    if (!sigA || !sigB)
    {
        rb_raise(Class_ImageMagickError, "can't get image signature");
    }

    res = memcmp(sigA, sigB, 64);
    res = res > 0 ? 1 : (res < 0 ? -1 :  0);    // reduce to 1, -1, 0

    return INT2FIX(res);
}

#[](key_arg) ⇒ String

Returns the value of the image property identified by key. An image may have any number of properties.

Each property is identified by a string (or symbol) key. The property value is a string. ImageMagick predefines some properties, including “Label”, “Comment”, “Signature”, and in some cases “EXIF”.

Parameters:

  • key_arg (String, Symbol) —

    the key to get

Returns:

  • (String) —

    property value or nil if key doesn’t exist

See Also:



979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
 
# File 'ext/RMagick/rmimage.cpp', line 979

VALUE
Image_aref(VALUE self, VALUE key_arg)
{
    Image *image;
    const char *key;
    const char *attr;

    image = rm_check_destroyed(self);

    switch (TYPE(key_arg))
    {
        case T_NIL:
            return Qnil;

        case T_SYMBOL:
            key = rb_id2name((ID)SYM2ID(key_arg));
            break;

        default:
            key = StringValueCStr(key_arg);
            if (*key == '\0')
            {
                return Qnil;
            }
            break;
    }


    if (rm_strcasecmp(key, "EXIF:*") == 0)
    {
        return rm_exif_by_entry(image);
    }
    else if (rm_strcasecmp(key, "EXIF:!") == 0)
    {
        return rm_exif_by_number(image);
    }

    attr = rm_get_property(image, key);
    return attr ? rb_str_new2(attr) : Qnil;
}

#[]=(key_arg, attr_arg) ⇒ Magick::Image

Sets the value of an image property. An image may have any number of properties.

  • Specify attr=nil to remove the key from the list.

  • SetImageProperty normally APPENDS the new value to any existing value. Since this usage is tremendously counter-intuitive, this function always deletes the existing value before setting the new value.

  • There’s no use checking the return value since SetImageProperty returns “False” for many reasons, some legitimate.

Parameters:

  • key_arg (String, Symbol) —

    the key to set

  • attr_arg (String) —

    the value to which to set it

Returns:



1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
 
# File 'ext/RMagick/rmimage.cpp', line 1034

VALUE
Image_aset(VALUE self, VALUE key_arg, VALUE attr_arg)
{
    Image *image;
    const char *key;
    char *attr;
    unsigned int okay;

    image = rm_check_frozen(self);

    attr = attr_arg == Qnil ? NULL : StringValueCStr(attr_arg);

    switch (TYPE(key_arg))
    {
        case T_NIL:
            return self;

        case T_SYMBOL:
            key = rb_id2name((ID)SYM2ID(key_arg));
            break;

        default:
            key = StringValueCStr(key_arg);
            if (*key == '\0')
            {
                return self;
            }
            break;
    }


    // Delete existing value. SetImageProperty returns False if
    // the attribute doesn't exist - we don't care.
    rm_set_property(image, key, NULL);
    // Set new value
    if (attr)
    {
        okay = rm_set_property(image, key, attr);
        if (!okay)
        {
            rb_warning("SetImageProperty failed (probably out of memory)");
        }
    }
    return self;
}

#_dump(depth) ⇒ String

Implement marshalling.

Parameters:

  • depth (Object) —

    unused

Returns:

  • (String) —

    a string representing the dumped image



6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
 
# File 'ext/RMagick/rmimage.cpp', line 6068

VALUE
Image__dump(VALUE self, VALUE depth ATTRIBUTE_UNUSED)
{
    Image *image;
    ImageInfo *info;
    void *blob;
    size_t length;
    DumpedImage mi;
    VALUE str;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    info = CloneImageInfo(NULL);
    if (!info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    strlcpy(info->magick, image->magick, sizeof(info->magick));

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ImageToBlob) args = { info, image, &length, exception };
    blob = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImageToBlob), &args);

    // Free ImageInfo first - error handling may raise an exception
    DestroyImageInfo(info);

    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    if (!blob)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    // Create a header for the blob: ID and version
    // numbers, followed by the length of the magick
    // string stored as a byte, followed by the
    // magick string itself.
    mi.id = DUMPED_IMAGE_ID;
    mi.mj = DUMPED_IMAGE_MAJOR_VERS;
    mi.mi = DUMPED_IMAGE_MINOR_VERS;
    strlcpy(mi.magick, image->magick, sizeof(mi.magick));
    mi.len = (unsigned char) min((size_t)UCHAR_MAX, rm_strnlen_s(mi.magick, sizeof(mi.magick)));

    // Concatenate the blob onto the header & return the result
    str = rb_str_new((char *)&mi, (long)(mi.len+offsetof(DumpedImage, magick)));
    str = rb_str_buf_cat(str, (char *)blob, (long)length);
    magick_free((void*)blob);

    RB_GC_GUARD(str);

    return str;
}

#adaptive_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Adaptively blurs the image by blurring more intensely near image edges and less intensely far from edges. The #adaptive_blur method blurs the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and adaptive_blur selects a suitable radius for you.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian in pixels, not counting the center pixel.

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation of the Laplacian, in pixels.

Returns:



456
457
458
459
460
 
# File 'ext/RMagick/rmimage.cpp', line 456

VALUE
Image_adaptive_blur(int argc, VALUE *argv, VALUE self)
{
    return adaptive_method(argc, argv, self, GVL_FUNC(AdaptiveBlurImage));
}

#adaptive_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #adaptive_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

The same as #adaptive_blur except only the specified channels are blurred.

Overloads:

  • #adaptive_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian in pixels, not counting the center pixel.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Laplacian, in pixels.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #adaptive_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian in pixels, not counting the center pixel.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Laplacian, in pixels.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



478
479
480
481
482
483
484
485
486
 
# File 'ext/RMagick/rmimage.cpp', line 478

VALUE
Image_adaptive_blur_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return adaptive_channel_method(argc, argv, self, GVL_FUNC(AdaptiveBlurImage));
#else
    return adaptive_channel_method(argc, argv, self, GVL_FUNC(AdaptiveBlurImageChannel));
#endif
}

#adaptive_resize(scale_val) ⇒ Magick::Image #adaptive_resize(cols, rows) ⇒ Magick::Image

Resizes the image with data dependent triangulation.

Overloads:

  • #adaptive_resize(scale_val) ⇒ Magick::Image

    Parameters:

    • scale_val (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver.

  • #adaptive_resize(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired column size

    • rows (Numeric) —

      The desired row size.

Returns:



503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
 
# File 'ext/RMagick/rmimage.cpp', line 503

VALUE
Image_adaptive_resize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned long rows, columns;
    double scale_val, drows, dcols;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            rows = NUM2ULONG(argv[1]);
            columns = NUM2ULONG(argv[0]);
            break;
        case 1:
            scale_val = NUM2DBL(argv[0]);
            if (scale_val < 0.0)
            {
                rb_raise(rb_eArgError, "invalid scale_val value (%g given)", scale_val);
            }
            drows = scale_val * image->rows + 0.5;
            dcols = scale_val * image->columns + 0.5;
            if (drows > (double)ULONG_MAX || dcols > (double)ULONG_MAX)
            {
                rb_raise(rb_eRangeError, "resized image too big");
            }
            rows = (unsigned long) drows;
            columns = (unsigned long) dcols;
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(AdaptiveResizeImage) args = { image, columns, rows, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AdaptiveResizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#adaptive_sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Adaptively sharpens the image by sharpening more intensely near image edges and less intensely far from edges.

The #adaptive_sharpen method sharpens the image with a Gaussian operator of the given radius and standard deviation (sigma).

For reasonable results, radius should be larger than sigma. Use a radius of 0 and adaptive_sharpen selects a suitable radius for you.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian in pixels, not counting the center pixel.

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation of the Laplacian, in pixels.

Returns:



564
565
566
567
568
 
# File 'ext/RMagick/rmimage.cpp', line 564

VALUE
Image_adaptive_sharpen(int argc, VALUE *argv, VALUE self)
{
    return adaptive_method(argc, argv, self, GVL_FUNC(AdaptiveSharpenImage));
}

#adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

The same as #adaptive_sharpen except only the specified channels are sharpened.

Overloads:

  • #adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian in pixels, not counting the center pixel.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Laplacian, in pixels.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian in pixels, not counting the center pixel.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Laplacian, in pixels.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



586
587
588
589
590
591
592
593
594
 
# File 'ext/RMagick/rmimage.cpp', line 586

VALUE
Image_adaptive_sharpen_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return adaptive_channel_method(argc, argv, self, GVL_FUNC(AdaptiveSharpenImage));
#else
    return adaptive_channel_method(argc, argv, self, GVL_FUNC(AdaptiveSharpenImageChannel));
#endif
}

#adaptive_threshold(width = 3, height = 3, bias = 0) ⇒ Magick::Image

Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn’t contain distinctive peaks.

Returns a new image.

Parameters:

  • width (Numeric) (defaults to: 3) —

    the width of the local neighborhood.

  • height (Numeric) (defaults to: 3) —

    the height of the local neighborhood.

  • bias (Numeric) (defaults to: 0) —

    the mean offset

Returns:



608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
 
# File 'ext/RMagick/rmimage.cpp', line 608

VALUE
Image_adaptive_threshold(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned long width = 3, height = 3;
    double bias = 0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 3:
            bias = NUM2DBL(argv[2]);
        case 2:
            height = NUM2ULONG(argv[1]);
        case 1:
            width  = NUM2ULONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(AdaptiveThresholdImage) args = { image, width, height, bias, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AdaptiveThresholdImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#add_compose_mask(mask) ⇒ Object

Associates a mask with an image that will be used as the destination image in a #composite operation.

The areas of the destination image that are masked by white pixels will be modified by the #composite method, while areas masked by black pixels are unchanged.

Parameters:

See Also:



653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
 
# File 'ext/RMagick/rmimage.cpp', line 653

VALUE
Image_add_compose_mask(VALUE self, VALUE mask)
{
    Image *image, *mask_image = NULL;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
    Image *clip_mask = NULL;
#endif

    image = rm_check_frozen(self);
    mask_image = rm_check_destroyed(mask);
    if (image->columns != mask_image->columns || image->rows != mask_image->rows)
    {
        rb_raise(rb_eArgError, "mask must be the same size as image");
    }

#if defined(IMAGEMAGICK_7)
    clip_mask = rm_clone_image(mask_image);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(NegateImage) args_NegateImage = { clip_mask, MagickFalse, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args_NegateImage);
    rm_check_exception(exception, clip_mask, DestroyOnError);
    GVL_STRUCT_TYPE(SetImageMask) args_SetImageMask = { image, CompositePixelMask, clip_mask, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageMask), &args_SetImageMask);
    DestroyImage(clip_mask);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    // Delete any previously-existing mask image.
    // Store a clone of the new mask image.
    GVL_STRUCT_TYPE(SetImageMask) args_SetImageMask = { image, mask_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageMask), &args_SetImageMask);
    GVL_STRUCT_TYPE(NegateImage) args_NegateImage = { image->mask, MagickFalse };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args_NegateImage);

    // Since both Set and GetImageMask clone the mask image I don't see any
    // way to negate the mask without referencing it directly. Sigh.
#endif

    return self;
}

#add_noise(noise) ⇒ Magick::Image

Adds random noise to the image.

Parameters:

  • noise (Magick::NoiseType) —

    the noise

Returns:



703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
 
# File 'ext/RMagick/rmimage.cpp', line 703

VALUE
Image_add_noise(VALUE self, VALUE noise)
{
    Image *image, *new_image;
    NoiseType noise_type;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    VALUE_TO_ENUM(noise, noise_type, NoiseType);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(AddNoiseImage) args = { image, noise_type, 1.0, exception };
#else
    GVL_STRUCT_TYPE(AddNoiseImage) args = { image, noise_type, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AddNoiseImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#add_noise_channel(noise_type, channel = Magick::AllChannels) ⇒ Magick::Image #add_noise_channel(noise_type, *channels) ⇒ Magick::Image

Adds random noise to the specified channel or channels in the image.

Overloads:

  • #add_noise_channel(noise_type, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • noise (Magick::NoiseType) —

      the noise

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #add_noise_channel(noise_type, *channels) ⇒ Magick::Image

    Parameters:

    • noise (Magick::NoiseType) —

      the noise

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
 
# File 'ext/RMagick/rmimage.cpp', line 740

VALUE
Image_add_noise_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    NoiseType noise_type;
    ExceptionInfo *exception;
    ChannelType channels;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "missing noise type argument");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    VALUE_TO_ENUM(argv[0], noise_type, NoiseType);
    channels = (ChannelType)(channels & ~OpacityChannel);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(AddNoiseImage) args = { image, noise_type, 1.0, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AddNoiseImage), &args);
    END_CHANNEL_MASK(new_image);
#else
    GVL_STRUCT_TYPE(AddNoiseImageChannel) args = { image, channels, noise_type, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AddNoiseImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#add_profile(name) ⇒ Magick::Image

Adds an ICC (a.k.a. ICM), IPTC, or generic profile. If the file contains more than one profile all the profiles are added.

Parameters:

  • name (String) —

    The filename of a file containing the profile.

Returns:



788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
 
# File 'ext/RMagick/rmimage.cpp', line 788

VALUE
Image_add_profile(VALUE self, VALUE name)
{
    // ImageMagick code based on the code for the "-profile" option in mogrify.c
    Image *image, *profile_image;
    ImageInfo *info;
    ExceptionInfo *exception;
    char *profile_name;
    char *profile_filename = NULL;
    const StringInfo *profile;

    image = rm_check_frozen(self);

    // ProfileImage issues a warning if something goes wrong.
    profile_filename = StringValueCStr(name);

    info = CloneImageInfo(NULL);
    if (!info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    profile = GetImageProfile(image, "iptc");
    if (profile)
    {
        info->profile = (void *)CloneStringInfo(profile);
    }
    strlcpy(info->filename, profile_filename, sizeof(info->filename));

    exception = AcquireExceptionInfo();
    profile_image = ReadImage(info, exception);
    DestroyImageInfo(info);
    rm_check_exception(exception, profile_image, DestroyOnError);
    rm_ensure_result(profile_image);

    ResetImageProfileIterator(profile_image);
    profile_name = GetNextImageProfile(profile_image);
    while (profile_name)
    {
        profile = GetImageProfile(profile_image, profile_name);
        if (profile)
        {
#if defined(IMAGEMAGICK_7)
            GVL_STRUCT_TYPE(ProfileImage) args = { image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), exception };
            CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ProfileImage), &args);
            if (rm_should_raise_exception(exception, RetainExceptionRetention))
#else
            GVL_STRUCT_TYPE(ProfileImage) args = { image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), MagickFalse };
            CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ProfileImage), &args);
            if (rm_should_raise_exception(&image->exception, RetainExceptionRetention))
#endif
            {
                break;
            }
        }
        profile_name = GetNextImageProfile(profile_image);
    }

    DestroyImage(profile_image);
#if defined(IMAGEMAGICK_7)
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    DestroyExceptionInfo(exception);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#affine_transform(affine) ⇒ Magick::Image

Transform an image as dictated by the affine matrix argument.

Parameters:

  • affine (Magick::AffineMatrix) —

    the affine matrix

Returns:



944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
 
# File 'ext/RMagick/rmimage.cpp', line 944

VALUE
Image_affine_transform(VALUE self, VALUE affine)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    AffineMatrix matrix;

    image = rm_check_destroyed(self);

    // Convert Magick::AffineMatrix to AffineMatrix structure.
    Export_AffineMatrix(&matrix, affine);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(AffineTransformImage) args = { image, &matrix, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AffineTransformImage), &args);
    new_image = reinterpret_cast<decltype(new_image)>(ret);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#alpha ⇒ Boolean #alpha(value) ⇒ Magick::AlphaChannelOption

Get/Set alpha channel.

  • Replaces #matte=, #alpha=

  • Originally there was an alpha attribute getter and setter. These are replaced with alpha? and alpha(type). We still define (but don’t document) alpha=. For backward compatibility, if this method is called without an argument, make it act like the old alpha getter and return true if the matte channel is active, false otherwise.

Overloads:

  • #alpha ⇒ Boolean

    Returns true if the alpha channel will be used, false otherwise. This calling is same as #alpha?.

    Returns:

    • (Boolean) —

      true or false

    See Also:

  • #alpha(value) ⇒ Magick::AlphaChannelOption

    Activates, deactivates, resets, or sets the alpha channel.

    Parameters:

    • value (Magick::AlphaChannelOption) —

      An AlphaChannelOption value

    Returns:

    • (Magick::AlphaChannelOption) —

      the given value



880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
 
# File 'ext/RMagick/rmimage.cpp', line 880

VALUE
Image_alpha(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    AlphaChannelOption alpha;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif


    // For backward compatibility, make alpha() act like alpha?
    if (argc == 0)
    {
        return Image_alpha_q(self);
    }
    else if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
    }


    image = rm_check_frozen(self);
    VALUE_TO_ENUM(argv[0], alpha, AlphaChannelOption);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageAlphaChannel) args = { image, alpha, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageAlphaChannel), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageAlphaChannel) args = { image, alpha };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageAlphaChannel), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return argv[0];
}

#alpha? ⇒ Boolean

Determine whether the image’s alpha channel is activated.

Returns:

  • (Boolean) —

    true if the image’s alpha channel is activated



926
927
928
929
930
931
932
933
934
935
 
# File 'ext/RMagick/rmimage.cpp', line 926

VALUE
Image_alpha_q(VALUE self)
{
    Image *image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
    return image->alpha_trait == BlendPixelTrait ? Qtrue : Qfalse;
#else
    return GetImageAlphaChannel(image) ? Qtrue : Qfalse;
#endif
}

#annotate(draw, width, height, x, y, text, &block) ⇒ Object

Provide an alternate version of Draw#annotate, for folks who want to find it in this class.



784
785
786
787
788
 
# File 'lib/rmagick_internal.rb', line 784

def annotate(draw, width, height, x, y, text, &block)
  check_destroyed
  draw.annotate(self, width, height, x, y, text, &block)
  self
end

#auto_gamma_channel(channel = Magick::AllChannels) ⇒ Magick::Image #auto_gamma_channel(*channels) ⇒ Magick::Image

“Automagically” adjust the gamma level of an image.

Overloads:

  • #auto_gamma_channel(channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #auto_gamma_channel(*channels) ⇒ Magick::Image

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



1188
1189
1190
1191
1192
1193
1194
1195
1196
 
# File 'ext/RMagick/rmimage.cpp', line 1188

VALUE
Image_auto_gamma_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return auto_channel(argc, argv, self, GVL_FUNC(AutoGammaImage));
#else
    return auto_channel(argc, argv, self, GVL_FUNC(AutoGammaImageChannel));
#endif
}

#auto_level_channel(channel = Magick::AllChannels) ⇒ Magick::Image #auto_level_channel(*channels) ⇒ Magick::Image

“Automagically” adjust the color levels of an image.

Overloads:

  • #auto_level_channel(channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #auto_level_channel(*channels) ⇒ Magick::Image

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



1210
1211
1212
1213
1214
1215
1216
1217
1218
 
# File 'ext/RMagick/rmimage.cpp', line 1210

VALUE
Image_auto_level_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return auto_channel(argc, argv, self, GVL_FUNC(AutoLevelImage));
#else
    return auto_channel(argc, argv, self, GVL_FUNC(AutoLevelImageChannel));
#endif
}

#auto_orient ⇒ Magick::Image

Rotates or flips the image based on the image’s EXIF orientation tag.

Note that only some models of modern digital cameras can tag an image with the orientation. If the image does not have an orientation tag, or the image is already properly oriented, then #auto_orient returns an exact copy of the image.

Returns:

See Also:



1299
1300
1301
1302
1303
1304
 
# File 'ext/RMagick/rmimage.cpp', line 1299

VALUE
Image_auto_orient(VALUE self)
{
    rm_check_destroyed(self);
    return auto_orient(False, self);
}

#auto_orient! ⇒ Magick::Image?

Rotates or flips the image based on the image’s EXIF orientation tag. Note that only some models of modern digital cameras can tag an image with the orientation. If the image does not have an orientation tag, or the image is already properly oriented, then #auto_orient! returns nil.

Returns:

  • (Magick::Image, nil) —

    nil if the image is already properly oriented, otherwise self

See Also:



1316
1317
1318
1319
1320
1321
 
# File 'ext/RMagick/rmimage.cpp', line 1316

VALUE
Image_auto_orient_bang(VALUE self)
{
    rm_check_frozen(self);
    return auto_orient(True, self);
}

#background_color ⇒ String

Return the name of the background color as a String.

Returns:

  • (String) —

    the background color



1329
1330
1331
1332
1333
1334
 
# File 'ext/RMagick/rmimage.cpp', line 1329

VALUE
Image_background_color(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return rm_pixelcolor_to_color_name(image, &image->background_color);
}

#background_color=(color) ⇒ Magick::Pixel, String

Set the the background color to the specified color spec.

Parameters:

Returns:



1343
1344
1345
1346
1347
1348
1349
 
# File 'ext/RMagick/rmimage.cpp', line 1343

VALUE
Image_background_color_eq(VALUE self, VALUE color)
{
    Image *image = rm_check_frozen(self);
    Color_to_PixelColor(&image->background_color, color);
    return color;
}

#base_columns ⇒ Numeric

Return the number of rows (before transformations).

Returns:

  • (Numeric) —

    the number of rows



1357
1358
1359
1360
1361
1362
 
# File 'ext/RMagick/rmimage.cpp', line 1357

VALUE
Image_base_columns(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return INT2FIX(image->magick_columns);
}

#base_filename ⇒ String

Return the image filename (before transformations).

Returns:

  • (String) —

    the base image filename (or the current filename if there is no base)



1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
 
# File 'ext/RMagick/rmimage.cpp', line 1369

VALUE
Image_base_filename(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    if (*image->magick_filename)
    {
        return rb_str_new2(image->magick_filename);
    }
    else
    {
        return rb_str_new2(image->filename);
    }
}

#base_rows ⇒ Numeric

Return the number of rows (before transformations).

Returns:

  • (Numeric) —

    the number of rows



1388
1389
1390
1391
1392
1393
 
# File 'ext/RMagick/rmimage.cpp', line 1388

VALUE
Image_base_rows(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return INT2FIX(image->magick_rows);
}

#bias ⇒ Float

Get image bias (used when convolving an image).

Returns:

  • (Float) —

    the image bias



1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
 
# File 'ext/RMagick/rmimage.cpp', line 1401

VALUE
Image_bias(VALUE self)
{
    Image *image;
    double bias = 0.0;

    image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
    {
        const char *artifact = GetImageArtifact(image, "convolve:bias");
        if (artifact != (const char *) NULL)
        {
            char *q;

            bias = InterpretLocaleValue(artifact, &q);
            if (*q == '%')
            {
                bias *= ((double) QuantumRange + 1.0) / 100.0;
            }
        }
    }
#else
    bias = image->bias;
#endif
    return rb_float_new(bias);
}

#bias=(pct) ⇒ Float, String

Set image bias (used when convolving an image).

Parameters:

  • pct (Float, String) —

    Either a number between 0.0 and 1.0 or a string in the form “NN%”

Returns:

  • (Float, String) —

    the given value



1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
 
# File 'ext/RMagick/rmimage.cpp', line 1435

VALUE
Image_bias_eq(VALUE self, VALUE pct)
{
    Image *image;
    double bias;

    image = rm_check_frozen(self);
    bias = rm_percentage(pct, 1.0) * QuantumRange;

#if defined(IMAGEMAGICK_7)
    {
        char artifact[21];

        snprintf(artifact, sizeof(artifact), "%.20g", bias);
        SetImageArtifact(image, "convolve:bias", artifact);
    }
#else
    image->bias = bias;
#endif

    return pct;
}

#bilevel_channel(threshold, channel = Magick::AllChannels) ⇒ Magick::Image #bilevel_channel(threshold, *channels) ⇒ Magick::Image

Changes the value of individual pixels based on the intensity of each pixel channel. The result is a high-contrast image.

Overloads:

  • #bilevel_channel(threshold, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • threshold (Float) —

      The threshold value, a number between 0 and QuantumRange.

  • #bilevel_channel(threshold, *channels) ⇒ Magick::Image

    Parameters:

    • threshold (Float) —

      The threshold value, a number between 0 and QuantumRange.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
 
# File 'ext/RMagick/rmimage.cpp', line 1471

VALUE
Image_bilevel_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double threshold;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "no threshold specified");
    }

    threshold = NUM2DBL(argv[0]);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(BilevelImage) args = { new_image, threshold, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BilevelImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(BilevelImageChannel) args = { new_image, channels, threshold };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BilevelImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#black_point_compensation ⇒ Boolean

Return current black point compensation attribute.

Returns:

  • (Boolean) —

    true or false



1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
 
# File 'ext/RMagick/rmimage.cpp', line 1519

VALUE
Image_black_point_compensation(VALUE self)
{
    Image *image;
    const char *attr;
    VALUE value;

    image = rm_check_destroyed(self);

    attr = rm_get_property(image, BlackPointCompensationKey);
    if (attr && rm_strcasecmp(attr, "true") == 0)
    {
        value = Qtrue;
    }
    else
    {
        value = Qfalse;
    }

    RB_GC_GUARD(value);

    return value;
}

#black_point_compensation=(arg) ⇒ Boolean

Set black point compensation attribute.

Parameters:

  • arg (Boolean) —

    true or false

Returns:

  • (Boolean) —

    the given value



1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
 
# File 'ext/RMagick/rmimage.cpp', line 1550

VALUE
Image_black_point_compensation_eq(VALUE self, VALUE arg)
{
    Image *image;
    const char *value;

    image = rm_check_frozen(self);
    rm_set_property(image, BlackPointCompensationKey, NULL);
    value = RTEST(arg) ? "true" : "false";
    rm_set_property(image, BlackPointCompensationKey, value);

    return arg;
}

#black_threshold(red) ⇒ Numeric #black_threshold(red, green) ⇒ Numeric #black_threshold(red, green, blue) ⇒ Numeric #black_threshold(red, green, blue, alpha: ) ⇒ Numeric

Forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.

Overloads:

  • #black_threshold(red) ⇒ Numeric

    Parameters:

    • red (Numeric) —

      the number for red channel

  • #black_threshold(red, green) ⇒ Numeric

    Parameters:

    • red (Numeric) —

      the number for red channel

    • green (Numeric) —

      the number for green channel

  • #black_threshold(red, green, blue) ⇒ Numeric

    Parameters:

    • red (Numeric) —

      the number for red channel

    • green (Numeric) —

      the number for green channel

    • blue (Numeric) —

      the number for blue channel

  • #black_threshold(red, green, blue, alpha: ) ⇒ Numeric

    Parameters:

    • red (Numeric) —

      the number for red channel

    • green (Numeric) —

      the number for green channel

    • blue (Numeric) —

      the number for blue channel

    • alpha (Numeric) (defaults to: ) —

      the number for alpha channel

Returns:

  • (Numeric) —

    a new image

See Also:



1590
1591
1592
1593
1594
 
# File 'ext/RMagick/rmimage.cpp', line 1590

VALUE
Image_black_threshold(int argc, VALUE *argv, VALUE self)
{
    return threshold_image(argc, argv, self, GVL_FUNC(BlackThresholdImage));
}

#blend(overlay, src_percent, dst_percent, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image

Adds the overlay image to the target image according to src_percent and dst_percent.

  • The default value for dst_percent is 100%-src_percent

Returns a new image.

Parameters:

  • overlay (Magick::Image, Magick::ImageList) —

    The source image for the composite operation. Either an imagelist or an image. If an imagelist, uses the current image.

  • src_percent (Float, String) —

    Either a non-negative number a string in the form “NN%”. If src_percentage is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. This argument is required.

  • dst_percent (Float, String) —

    Either a non-negative number a string in the form “NN%”. If src_percentage is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. This argument may omitted if no other arguments follow it. In this case the default is 100%-src_percentage.

  • gravity (Magick::GravityType) (defaults to: Magick::NorthWestGravity) —

    the gravity for offset. the offsets are measured from the NorthWest corner by default.

  • x_offset (Numeric) (defaults to: 0) —

    The offset that measured from the left-hand side of the target image.

  • y_offset (Numeric) (defaults to: 0) —

    The offset that measured from the top of the target image.

Returns:



1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
 
# File 'ext/RMagick/rmimage.cpp', line 1938

VALUE
Image_blend(int argc, VALUE *argv, VALUE self)
{
    VALUE ovly;
    Image *image, *overlay;
    double src_percent, dst_percent;
    long x_offset = 0L, y_offset = 0L;

    image = rm_check_destroyed(self);

    if (argc < 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
    }

    ovly = rm_cur_image(argv[0]);
    overlay = rm_check_destroyed(ovly);

    if (argc > 3)
    {
        get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
        // There must be 3 arguments left
        argc = 3;
    }

    switch (argc)
    {
        case 3:
            dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
            src_percent = rm_percentage(argv[1], 1.0) * 100.0;
            break;
        case 2:
            src_percent = rm_percentage(argv[1], 1.0) * 100.0;
            dst_percent = FMAX(100.0 - src_percent, 0);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
            break;
    }

    RB_GC_GUARD(ovly);

    return special_composite(image, overlay, src_percent, dst_percent,
                             x_offset, y_offset, BlendCompositeOp);

}

#blue_shift(factor = 1.5) ⇒ Magick::Image

Simulate a scene at nighttime in the moonlight.

Returns a new image.

Parameters:

  • factor (Float) (defaults to: 1.5) —

    Larger values increase the effect.

Returns:



1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
 
# File 'ext/RMagick/rmimage.cpp', line 1994

VALUE
Image_blue_shift(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double factor = 1.5;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 1:
            factor = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }


    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(BlueShiftImage) args = { image, factor, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlueShiftImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

Blurs the specified channel. Convolves the image with a Gaussian operator of the given radius and standard deviation (sigma).

Overloads:

  • #blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      the radius value

    • sigma (Float) (defaults to: 1.0) —

      the sigma value

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      the radius value

    • sigma (Float) (defaults to: 1.0) —

      the sigma value

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
 
# File 'ext/RMagick/rmimage.cpp', line 2041

VALUE
Image_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    ChannelType channels;
    double radius = 0.0, sigma = 1.0;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // There can be 0, 1, or 2 remaining arguments.
    switch (argc)
    {
        case 2:
            sigma = NUM2DBL(argv[1]);
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(BlurImage) args = { image, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlurImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(BlurImageChannel) args = { image, channels, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlurImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#blur_image(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Blur the image.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    the radius value

  • sigma (Float) (defaults to: 1.0) —

    the sigma value

Returns:



2092
2093
2094
2095
2096
 
# File 'ext/RMagick/rmimage.cpp', line 2092

VALUE
Image_blur_image(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GVL_FUNC(BlurImage));
}

#border(width, height, color) ⇒ Magick::Image

Surrounds the image with a border of the specified width, height, and named color.

Parameters:

  • width (Numeric) —

    the width of the border

  • height (Numeric) —

    the height of the border

  • color (Magick::Pixel, String) —

    the color of the border

Returns:



2179
2180
2181
2182
2183
2184
 
# File 'ext/RMagick/rmimage.cpp', line 2179

VALUE
Image_border(VALUE self, VALUE width, VALUE height, VALUE color)
{
    rm_check_destroyed(self);
    return border(False, self, width, height, color);
}

#border!(width, height, color) ⇒ Object

Surrounds the image with a border of the specified width, height, and named color. In-place form of #border.

Parameters:

  • width (Numeric) —

    the width of the border

  • height (Numeric) —

    the height of the border

  • color (Magick::Pixel, String) —

    the color of the border



2163
2164
2165
2166
2167
2168
 
# File 'ext/RMagick/rmimage.cpp', line 2163

VALUE
Image_border_bang(VALUE self, VALUE width, VALUE height, VALUE color)
{
    rm_check_frozen(self);
    return border(True, self, width, height, color);
}

#border_color ⇒ String

Return the name of the border color as a String.

Returns:

  • (String) —

    the name of the border color



2192
2193
2194
2195
2196
2197
 
# File 'ext/RMagick/rmimage.cpp', line 2192

VALUE
Image_border_color(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return rm_pixelcolor_to_color_name(image, &image->border_color);
}

#border_color=(color) ⇒ Magick::Pixel, String

Set the the border color.

Parameters:

Returns:



2206
2207
2208
2209
2210
2211
2212
 
# File 'ext/RMagick/rmimage.cpp', line 2206

VALUE
Image_border_color_eq(VALUE self, VALUE color)
{
    Image *image = rm_check_frozen(self);
    Color_to_PixelColor(&image->border_color, color);
    return color;
}

#bounding_box ⇒ Magick::Rectangle

Returns the bounding box of an image canvas.

Returns:

  • (Magick::Rectangle) —

    the bounding box



2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
 
# File 'ext/RMagick/rmimage.cpp', line 2220

VALUE
Image_bounding_box(VALUE self)
{
    Image *image;
    RectangleInfo box;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();
    box = GetImageBoundingBox(image, exception);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return Import_RectangleInfo(&box);
}

#change_geometry(geom_arg) {|column, row, image| ... } ⇒ Object

Note:

#change_geometry! is an alias for #change_geometry.

This method supports resizing a method by specifying constraints. For example, you can specify that the image should be resized such that the aspect ratio should be retained but the resulting image should be no larger than 640 pixels wide and 480 pixels tall.

Examples:

image.change_geometry!('320x240') { |cols, rows, img|
  img.resize!(cols, rows)
}

Parameters:

  • geom_arg (String) —

    the geometry string

Yields:

  • (column, row, image)

Yield Parameters:

  • column (Numeric) —

    The desired column size

  • row (Numeric) —

    The desired row size

  • image (Magick::Image) —

    self

See Also:



2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
 
# File 'ext/RMagick/rmimage.cpp', line 2352

VALUE
Image_change_geometry(VALUE self, VALUE geom_arg)
{
    Image *image;
    RectangleInfo rect;
    VALUE geom_str;
    char *geometry;
    unsigned int flags;
    VALUE ary;

    image = rm_check_destroyed(self);
    geom_str = rb_String(geom_arg);
    geometry = StringValueCStr(geom_str);

    memset(&rect, 0, sizeof(rect));

    SetGeometry(image, &rect);
    flags = ParseMetaGeometry(geometry, &rect.x, &rect.y, &rect.width, &rect.height);
    if (flags == NoValue)
    {
        rb_raise(rb_eArgError, "invalid geometry string `%s'", geometry);
    }

    ary = rb_ary_new2(3);
    rb_ary_store(ary, 0, ULONG2NUM(rect.width));
    rb_ary_store(ary, 1, ULONG2NUM(rect.height));
    rb_ary_store(ary, 2, self);

    RB_GC_GUARD(geom_str);
    RB_GC_GUARD(ary);

    return rb_yield(ary);
}

#change_geometry!(geom_arg) {|column, row, image| ... } ⇒ Object

Note:

#change_geometry! is an alias for #change_geometry.

This method supports resizing a method by specifying constraints. For example, you can specify that the image should be resized such that the aspect ratio should be retained but the resulting image should be no larger than 640 pixels wide and 480 pixels tall.

Examples:

image.change_geometry!('320x240') { |cols, rows, img|
  img.resize!(cols, rows)
}

Parameters:

  • geom_arg (String) —

    the geometry string

Yields:

  • (column, row, image)

Yield Parameters:

  • column (Numeric) —

    The desired column size

  • row (Numeric) —

    The desired row size

  • image (Magick::Image) —

    self

See Also:



2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
 
# File 'ext/RMagick/rmimage.cpp', line 2352

VALUE
Image_change_geometry(VALUE self, VALUE geom_arg)
{
    Image *image;
    RectangleInfo rect;
    VALUE geom_str;
    char *geometry;
    unsigned int flags;
    VALUE ary;

    image = rm_check_destroyed(self);
    geom_str = rb_String(geom_arg);
    geometry = StringValueCStr(geom_str);

    memset(&rect, 0, sizeof(rect));

    SetGeometry(image, &rect);
    flags = ParseMetaGeometry(geometry, &rect.x, &rect.y, &rect.width, &rect.height);
    if (flags == NoValue)
    {
        rb_raise(rb_eArgError, "invalid geometry string `%s'", geometry);
    }

    ary = rb_ary_new2(3);
    rb_ary_store(ary, 0, ULONG2NUM(rect.width));
    rb_ary_store(ary, 1, ULONG2NUM(rect.height));
    rb_ary_store(ary, 2, self);

    RB_GC_GUARD(geom_str);
    RB_GC_GUARD(ary);

    return rb_yield(ary);
}

#changed? ⇒ Boolean

Return true if any pixel in the image has been altered since the image was constituted.

Returns:

  • (Boolean) —

    true if altered, false otherwise



2392
2393
2394
2395
2396
2397
2398
 
# File 'ext/RMagick/rmimage.cpp', line 2392

VALUE
Image_changed_q(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    VALUE okay = IsTaintImage(image) ? Qtrue : Qfalse;
    return okay;
}

#channel(channel_arg) ⇒ Magick::Image

Extract a channel from the image. A channel is a particular color component of each pixel in the image.

Parameters:

  • channel_arg (Magick::ChannelType) —

    the type of the channel to extract

Returns:



2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
 
# File 'ext/RMagick/rmimage.cpp', line 2408

VALUE
Image_channel(VALUE self, VALUE channel_arg)
{
    Image *image, *new_image;
    ChannelType channel;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    VALUE_TO_ENUM(channel_arg, channel, ChannelType);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SeparateImage) args = { image, channel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SeparateImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    new_image = rm_clone_image(image);
    GVL_STRUCT_TYPE(SeparateImageChannel) args = { new_image, channel };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SeparateImageChannel), &args);

    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array #compare_channel(image, metric, channel = Magick::AllChannels) {|Magick::OptionalMethodArguments| ... } ⇒ Array #compare_channel(image, metric, *channels) ⇒ Array #compare_channel(image, metric, *channels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

Compare one or more channels in two images and returns the specified distortion metric and a comparison image.

Overloads:

  • #compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #compare_channel(image, metric, channel = Magick::AllChannels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

    When a block is given, compare_channel yields with a block argument you can optionally use to set attributes.

    • options.highlight_color = color

      • Emphasize pixel differences with this color. The default is partially transparent red.

    • options.lowlight_color = color

      • Demphasize pixel differences with this color. The default is partially transparent white.

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

    Yields:

  • #compare_channel(image, metric, *channels) ⇒ Array

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) —

      a ChannelType arguments.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #compare_channel(image, metric, *channels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

    When a block is given, compare_channel yields with a block argument you can optionally use to set attributes.

    • options.highlight_color = color

      • Emphasize pixel differences with this color. The default is partially transparent red.

    • options.lowlight_color = color

      • Demphasize pixel differences with this color. The default is partially transparent white.

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) —

      a ChannelType arguments.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

    Yields:

Returns:

  • (Array) —

    The first element is a difference image, the second is a the value of the computed distortion represented as a Float.



3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
 
# File 'ext/RMagick/rmimage.cpp', line 3444

VALUE
Image_compare_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *r_image, *difference_image;
    double distortion;
    VALUE ary, ref;
    MetricType metric_type;
    ChannelType channels;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    if (argc > 2)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc != 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
    }

    rm_get_optional_arguments(self);

    ref = rm_cur_image(argv[0]);
    r_image = rm_check_destroyed(ref);

    VALUE_TO_ENUM(argv[1], metric_type, MetricType);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(CompareImages) args = { image, r_image, metric_type, &distortion, exception };
    difference_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImages), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(CompareImageChannels) args = { image, r_image, channels, metric_type, &distortion, exception };
    difference_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImageChannels), &args);
#endif
    rm_check_exception(exception, difference_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    ary = rb_ary_new2(2);
    rb_ary_store(ary, 0, rm_image_new(difference_image));
    rb_ary_store(ary, 1, rb_float_new(distortion));

    RB_GC_GUARD(ary);
    RB_GC_GUARD(ref);

    return ary;
}

#channel_depth(channel = Magick::AllChannels) ⇒ Numeric #channel_depth(*channels) ⇒ Numeric

Returns the maximum depth for the specified channel or channels.

Overloads:

  • #channel_depth(channel = Magick::AllChannels) ⇒ Numeric

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #channel_depth(*channels) ⇒ Numeric

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

  • (Numeric) —

    the channel depth



2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
 
# File 'ext/RMagick/rmimage.cpp', line 2450

VALUE
Image_channel_depth(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    ChannelType channels;
    size_t channel_depth;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // Ensure all arguments consumed.
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(GetImageDepth) args = { image, exception };
    channel_depth = (size_t)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageDepth), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(GetImageChannelDepth) args = { image, channels, exception };
    channel_depth = (size_t)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageChannelDepth), &args);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return ULONG2NUM(channel_depth);
}

#channel_entropy(*args) ⇒ Object 



2648
2649
2650
2651
2652
 
# File 'ext/RMagick/rmimage.cpp', line 2648

VALUE
Image_channel_entropy(int argc ATTRIBUTE_UNUSED, VALUE *argv ATTRIBUTE_UNUSED, VALUE self ATTRIBUTE_UNUSED)
{
    rm_not_implemented();
}

#channel_extrema(channel = Magick::AllChannels) ⇒ Array<Numeric> #channel_extrema(*channels) ⇒ Array<Numeric>

Returns the minimum and maximum intensity values for the specified channel or channels.

Overloads:

  • #channel_extrema(channel = Magick::AllChannels) ⇒ Array<Numeric>

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #channel_extrema(*channels) ⇒ Array<Numeric>

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

  • (Array<Numeric>) —

    The first element in the array is the minimum value. The second element is the maximum value.



2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
 
# File 'ext/RMagick/rmimage.cpp', line 2498

VALUE
Image_channel_extrema(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    ChannelType channels;
    ExceptionInfo *exception;
    size_t min, max;
    VALUE ary;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // Ensure all arguments consumed.
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(GetImageExtrema) args = { image, &min, &max, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageExtrema), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(GetImageChannelExtrema) args = { image, channels, &min, &max, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageChannelExtrema), &args);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    ary = rb_ary_new2(2);
    rb_ary_store(ary, 0, ULONG2NUM(min));
    rb_ary_store(ary, 1, ULONG2NUM(max));

    RB_GC_GUARD(ary);

    return ary;
}

#channel_mean(channel = Magick::AllChannels) ⇒ Array<Float> #channel_mean(*channels) ⇒ Array<Float>

Returns the mean and standard deviation values for the specified channel or channels.

Overloads:

  • #channel_mean(channel = Magick::AllChannels) ⇒ Array<Float>

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #channel_mean(*channels) ⇒ Array<Float>

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

  • (Array<Float>) —

    The first element in the array is the mean value. The second element is the standard deviation.



2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
 
# File 'ext/RMagick/rmimage.cpp', line 2553

VALUE
Image_channel_mean(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    ChannelType channels;
    ExceptionInfo *exception;
    double mean, stddev;
    VALUE ary;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // Ensure all arguments consumed.
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(GetImageMean) args = { image, &mean, &stddev, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageMean), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(GetImageChannelMean) args = { image, channels, &mean, &stddev, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageChannelMean), &args);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    ary = rb_ary_new2(2);
    rb_ary_store(ary, 0, rb_float_new(mean));
    rb_ary_store(ary, 1, rb_float_new(stddev));

    RB_GC_GUARD(ary);

    return ary;
}

#charcoal(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Return a new image that is a copy of the input image with the edges highlighted.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the pixel neighborhood.

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation of the Gaussian, in pixels.

Returns:



2663
2664
2665
2666
2667
 
# File 'ext/RMagick/rmimage.cpp', line 2663

VALUE
Image_charcoal(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GVL_FUNC(CharcoalImage));
}

#check_destroyed ⇒ nil

Raises DestroyedImageError if the image has been destroyed. Returns nil otherwise.

Returns:

  • (nil) —

    nil

Raises:



2676
2677
2678
2679
2680
2681
 
# File 'ext/RMagick/rmimage.cpp', line 2676

VALUE
Image_check_destroyed(VALUE self)
{
    rm_check_destroyed(self);
    return Qnil;
}

#chop(x, y, width, height) ⇒ Magick::Image

Remove a region of an image and collapses the image to occupy the removed portion.

Parameters:

  • x (Numeric) —

    x position of start of region

  • y (Numeric) —

    y position of start of region

  • width (Numeric) —

    width of region

  • height (Numeric) —

    height of region

Returns:



2693
2694
2695
2696
2697
2698
 
# File 'ext/RMagick/rmimage.cpp', line 2693

VALUE
Image_chop(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
    rm_check_destroyed(self);
    return xform_image(False, self, x, y, width, height, GVL_FUNC(ChopImage));
}

#chromaticity ⇒ Magick::Chromaticity

Return the red, green, blue, and white-point chromaticity values as a Chromaticity.

Returns:

  • (Magick::Chromaticity) —

    the chromaticity values



2706
2707
2708
2709
2710
2711
 
# File 'ext/RMagick/rmimage.cpp', line 2706

VALUE
Image_chromaticity(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return ChromaticityInfo_new(&image->chromaticity);
}

#chromaticity=(chroma) ⇒ Magick::Chromaticity

Set the red, green, blue, and white-point chromaticity values from a Chromaticity.

Parameters:

  • chroma (Magick::Chromaticity) —

    the chromaticity

Returns:

  • (Magick::Chromaticity) —

    the given value



2720
2721
2722
2723
2724
2725
2726
 
# File 'ext/RMagick/rmimage.cpp', line 2720

VALUE
Image_chromaticity_eq(VALUE self, VALUE chroma)
{
    Image *image = rm_check_frozen(self);
    Export_ChromaticityInfo(&image->chromaticity, chroma);
    return chroma;
}

#class_type ⇒ Magick::ClassType

Return the image’s storage class (a.k.a. storage type, class type). If DirectClass then the pixels contain valid RGB or CMYK colors. If PseudoClass then the image has a colormap referenced by the pixel’s index member.

Returns:

  • (Magick::ClassType) —

    the storage class



13800
13801
13802
13803
13804
13805
 
# File 'ext/RMagick/rmimage.cpp', line 13800

VALUE
Image_class_type(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return ClassType_find(image->storage_class);
}

#class_type=(new_class_type) ⇒ Magick::ClassType

Change the image’s storage class.

Parameters:

  • new_class_type (Magick::ClassType) —

    the storage class

Returns:

  • (Magick::ClassType) —

    the given value



13814
13815
13816
13817
13818
13819
13820
13821
13822
13823
13824
13825
13826
13827
13828
13829
13830
13831
13832
13833
13834
13835
13836
13837
13838
13839
13840
13841
13842
13843
13844
13845
13846
13847
13848
13849
13850
13851
13852
13853
13854
13855
13856
13857
13858
13859
13860
13861
13862
13863
13864
13865
13866
13867
13868
13869
13870
13871
13872
13873
13874
 
# File 'ext/RMagick/rmimage.cpp', line 13814

VALUE
Image_class_type_eq(VALUE self, VALUE new_class_type)
{
    Image *image;
    ClassType class_type;
    QuantizeInfo qinfo;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    VALUE_TO_ENUM(new_class_type, class_type, ClassType);

    if (class_type == UndefinedClass)
    {
        rb_raise(rb_eArgError, "Invalid class type specified.");
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
#endif

    if (image->storage_class == PseudoClass && class_type == DirectClass)
    {
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(SyncImage) args = { image, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SyncImage), &args);
        CHECK_EXCEPTION();
#else
        GVL_STRUCT_TYPE(SyncImage) args = { image };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SyncImage), &args);
#endif
        magick_free(image->colormap);
        image->colormap = NULL;
    }
    else if (image->storage_class == DirectClass && class_type == PseudoClass)
    {
        GetQuantizeInfo(&qinfo);
        qinfo.number_colors = QuantumRange+1;
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(QuantizeImage) args = { &qinfo, image, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(QuantizeImage), &args);
        CHECK_EXCEPTION();
#else
        GVL_STRUCT_TYPE(QuantizeImage) args = { &qinfo, image };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(QuantizeImage), &args);
#endif
    }

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, class_type, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, class_type };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
#endif
    return new_class_type;
}

#clone ⇒ Magick::Image

Same as #dup except the frozen state of the original is propagated to the new copy.

Returns:



2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
 
# File 'ext/RMagick/rmimage.cpp', line 2735

VALUE
Image_clone(VALUE self)
{
    VALUE clone;

    clone = Image_dup(self);
    if (OBJ_FROZEN(self))
    {
        OBJ_FREEZE(clone);
    }

    RB_GC_GUARD(clone);

    return clone;
}

#clut_channel(clut_image, channel = Magick::AllChannels) ⇒ Magick::Image #clut_channel(clut_image, *channels) ⇒ Magick::Image

Replace the channel values in the target image with a lookup of its replacement value in an LUT gradient image.

The LUT image should be either a single row or column image of replacement colors. The lookup is controlled by the -interpolate setting, especially for an LUT which is not the full length needed by the IM installed Quality (Q) level. Good settings for this is the default ‘bilinear’ or ‘bicubic’ interpolation setting for a smooth color gradient, or ‘integer’ for a direct unsmoothed lookup of color values.

This method is especially suited to replacing a grayscale image with specific color gradient from the CLUT image.

Overloads:

  • #clut_channel(clut_image, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • clut_image (Magick::Image) —

      The LUT gradient image.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #clut_channel(clut_image, *channels) ⇒ Magick::Image

    Parameters:

    • clut_image (Magick::Image) —

      The LUT gradient image.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
 
# File 'ext/RMagick/rmimage.cpp', line 2775

VALUE
Image_clut_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *clut;
    ChannelType channels;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    // check_destroyed before confirming the arguments
    if (argc >= 1)
    {
        rm_check_destroyed(argv[0]);
        channels = extract_channels(&argc, argv);
        if (argc != 1)
        {
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
        }
    }
    else
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
    }

    TypedData_Get_Struct(argv[0], Image, &rm_image_data_type, clut);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(ClutImage) args = { image, clut, image->interpolate, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ClutImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    END_CHANNEL_MASK(image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ClutImageChannel) args = { image, channels, clut };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ClutImageChannel), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(image, RetainOnError);
    rm_check_image_exception(clut, RetainOnError);
#endif
    if (!okay)
    {
        rb_raise(rb_eRuntimeError, "ClutImageChannel failed.");
    }

    return self;
}

#color_fill_to_border(x, y, fill) ⇒ Object

Set all pixels that are neighbors of x,y and are not the border color to the fill color



806
807
808
 
# File 'lib/rmagick_internal.rb', line 806

def color_fill_to_border(x, y, fill)
  color_flood_fill(border_color, fill, x, y, Magick::FillToBorderMethod)
end

#color_flood_fill(target_color, fill_color, xv, yv, method) ⇒ Magick::Image

Change the color value of any pixel that matches target_color and is an immediate neighbor.

Parameters:

  • target_color (Magick::Pixel, String) —

    the target color

  • fill_color (Magick::Pixel, String) —

    the color to fill

  • xv (Numeric) —

    the x position

  • yv (Numeric) —

    the y position

  • method (Magick::PaintMethod) —

    the method to call

Returns:

See Also:



3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
 
# File 'ext/RMagick/rmimage.cpp', line 3081

VALUE
Image_color_flood_fill(VALUE self, VALUE target_color, VALUE fill_color,
                       VALUE xv, VALUE yv, VALUE method)
{
    Image *image, *new_image;
    PixelColor target;
    DrawInfo *draw_info;
    PixelColor fill;
    long x, y;
    int fill_method;
    MagickPixel target_mpp;
    MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    // The target and fill args can be either a color name or
    // a Magick::Pixel.
    Color_to_PixelColor(&target, target_color);
    Color_to_PixelColor(&fill, fill_color);

    x = NUM2LONG(xv);
    y = NUM2LONG(yv);
    if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
    {
        rb_raise(rb_eArgError, "target out of range. %lux%lu given, image is %" RMIuSIZE "x%" RMIuSIZE "",
                 x, y, image->columns, image->rows);
    }

    VALUE_TO_ENUM(method, fill_method, PaintMethod);
    if (!(fill_method == FloodfillMethod || fill_method == FillToBorderMethod))
    {
        rb_raise(rb_eArgError, "paint method must be FloodfillMethod or "
                 "FillToBorderMethod (%d given)", fill_method);
    }

    draw_info = CloneDrawInfo(NULL, NULL);
    if (!draw_info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    draw_info->fill = fill;

    new_image = rm_clone_image(image);

    rm_init_magickpixel(new_image, &target_mpp);
    if (fill_method == FillToBorderMethod)
    {
        invert = MagickTrue;
        target_mpp.red   = (MagickRealType) image->border_color.red;
        target_mpp.green = (MagickRealType) image->border_color.green;
        target_mpp.blue  = (MagickRealType) image->border_color.blue;
    }
    else
    {
        invert = MagickFalse;
        target_mpp.red   = (MagickRealType) target.red;
        target_mpp.green = (MagickRealType) target.green;
        target_mpp.blue  = (MagickRealType) target.blue;
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, draw_info, &target_mpp, x, y, invert, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, DefaultChannels, draw_info, &target_mpp, x, y, invert };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);

    DestroyDrawInfo(draw_info);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#color_floodfill(x, y, fill) ⇒ Object

Set all pixels that have the same color as the pixel at x,y and are neighbors to the fill color



799
800
801
802
 
# File 'lib/rmagick_internal.rb', line 799

def color_floodfill(x, y, fill)
  target = pixel_color(x, y)
  color_flood_fill(target, fill, x, y, Magick::FloodfillMethod)
end

#color_histogram ⇒ Hash

Computes the number of times each unique color appears in the image.

Returns:

  • (Hash) —

    Each key in the hash is a pixel representing a color that appears in the image. The value associated with the key is the number of times that color appears in the image.



2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
 
# File 'ext/RMagick/rmimage.cpp', line 2835

VALUE
Image_color_histogram(VALUE self)
{
    Image *image, *dc_copy = NULL;
    VALUE hash, pixel;
    size_t x, colors;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    PixelInfo *histogram;
#else
    ColorPacket *histogram;
#endif

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();

    // If image not DirectClass make a DirectClass copy.
    if (image->storage_class != DirectClass)
    {
        dc_copy = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(SetImageStorageClass) args = { dc_copy, DirectClass, exception };
#else
        GVL_STRUCT_TYPE(SetImageStorageClass) args = { dc_copy, DirectClass };
#endif
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
        image = dc_copy;
    }

    GVL_STRUCT_TYPE(GetImageHistogram) args = { image, &colors, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageHistogram), &args);
    histogram = reinterpret_cast<decltype(histogram)>(ret);

    if (histogram == NULL)
    {
        if (dc_copy)
        {
            DestroyImage(dc_copy);
        }
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    if (rm_should_raise_exception(exception, DestroyExceptionRetention))
    {
        RelinquishMagickMemory(histogram);
        if (dc_copy)
        {
            DestroyImage(dc_copy);
        }

        rm_raise_exception(exception);
    }

    hash = rb_hash_new();
    for (x = 0; x < colors; x++)
    {
#if defined(IMAGEMAGICK_7)
        pixel = Pixel_from_PixelColor(&histogram[x]);
#else
        pixel = Pixel_from_PixelColor(&histogram[x].pixel);
#endif
        rb_hash_aset(hash, pixel, ULONG2NUM((unsigned long)histogram[x].count));
    }

    /*
        Christy evidently didn't agree with Bob's memory management.
    */
    RelinquishMagickMemory(histogram);

    if (dc_copy)
    {
        // Do not trace destruction
        DestroyImage(dc_copy);
    }

    RB_GC_GUARD(hash);
    RB_GC_GUARD(pixel);

    return hash;
}

#color_point(x, y, fill) ⇒ Object

Set the color at x,y



791
792
793
794
795
 
# File 'lib/rmagick_internal.rb', line 791

def color_point(x, y, fill)
  f = copy
  f.pixel_color(x, y, fill)
  f
end

#color_profile ⇒ String?

Return the ICC color profile as a String.

  • If there is no profile, returns “”

  • This method has no real use but is retained for compatibility with earlier releases of RMagick, where it had no real use either.

Returns:

  • (String, nil) —

    the ICC color profile



3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
 
# File 'ext/RMagick/rmimage.cpp', line 3031

VALUE
Image_color_profile(VALUE self)
{
    Image *image;
    const StringInfo *profile;

    image = rm_check_destroyed(self);
    profile = GetImageProfile(image, "icc");
    if (!profile)
    {
        return Qnil;
    }

    return rb_str_new((char *)profile->datum, (long)profile->length);

}

#color_profile=(profile) ⇒ String

Set the ICC color profile.

  • Pass nil to remove any existing profile.

  • Removes any existing profile before adding the new one.

Parameters:

  • profile (String) —

    the profile to set

Returns:

  • (String) —

    the given profile



3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
 
# File 'ext/RMagick/rmimage.cpp', line 3058

VALUE
Image_color_profile_eq(VALUE self, VALUE profile)
{
    Image_delete_profile(self, rb_str_new2("ICC"));
    if (profile != Qnil)
    {
        set_profile(self, "ICC", profile);
    }
    return profile;
}

#color_reset!(fill) ⇒ Object

Set all pixels to the fill color. Very similar to Image#erase! Accepts either String or Pixel arguments



812
813
814
815
816
817
818
819
820
821
822
823
824
 
# File 'lib/rmagick_internal.rb', line 812

def color_reset!(fill)
  save = background_color
  # Change the background color _outside_ the begin block
  # so that if this object is frozen the exeception will be
  # raised before we have to handle it explicitly.
  self.background_color = fill
  begin
    erase!
  ensure
    self.background_color = save
  end
  self
end

#colorize(red, green, blue, target) ⇒ Magick::Image #colorize(red, green, blue, matte, target) ⇒ Magick::Image

Blend the fill color specified by “target” with each pixel in the image. Specify the percentage blend for each r, g, b component.

Overloads:

  • #colorize(red, green, blue, target) ⇒ Magick::Image

    Parameters:

    • red (Float) —

      The percentage of the fill color red

    • green (Float) —

      The percentage of the fill color green

    • blue (Float) —

      The percentage of the fill color blue

    • target (Magick::Pixel, String) —

      the color name

  • #colorize(red, green, blue, matte, target) ⇒ Magick::Image

    Parameters:

    • red (Float) —

      The percentage of the fill color red

    • green (Float) —

      The percentage of the fill color green

    • blue (Float) —

      The percentage of the fill color blue

    • matte (Float) —

      The percentage of the fill color transparency

    • target (Magick::Pixel, String) —

      the color name

Returns:



3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
 
# File 'ext/RMagick/rmimage.cpp', line 3182

VALUE
Image_colorize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double red, green, blue, matte;
    char opacity[50];
    PixelColor target;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    if (argc == 4)
    {
        red   = floor(100*NUM2DBL(argv[0])+0.5);
        green = floor(100*NUM2DBL(argv[1])+0.5);
        blue  = floor(100*NUM2DBL(argv[2])+0.5);
        Color_to_PixelColor(&target, argv[3]);
        snprintf(opacity, sizeof(opacity), "%f/%f/%f", red, green, blue);
    }
    else if (argc == 5)
    {
        red   = floor(100*NUM2DBL(argv[0])+0.5);
        green = floor(100*NUM2DBL(argv[1])+0.5);
        blue  = floor(100*NUM2DBL(argv[2])+0.5);
        matte = floor(100*NUM2DBL(argv[3])+0.5);
        Color_to_PixelColor(&target, argv[4]);
        snprintf(opacity, sizeof(opacity), "%f/%f/%f/%f", red, green, blue, matte);
    }
    else
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 4 or 5)", argc);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(ColorizeImage) args = { image, opacity, &target, exception };
#else
    GVL_STRUCT_TYPE(ColorizeImage) args = { image, opacity, target, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ColorizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#colormap(index) ⇒ String #colormap(index, new_color) ⇒ String

Return the color in the colormap at the specified index. If a new color is specified, replaces the color at the index with the new color.

Overloads:

  • #colormap(index) ⇒ String

    Parameters:

    • index (Numeric) —

      A number between 0 and the number of colors in the color map. If the value is out of range, colormap raises an IndexError. You can get the number of colors in the color map from the colors attribute.

  • #colormap(index, new_color) ⇒ String

    Parameters:

    • index (Numeric) —

      A number between 0 and the number of colors in the color map. If the value is out of range, colormap raises an IndexError. You can get the number of colors in the color map from the colors attribute.

    • new_color (Magick::Pixel, String) —

      the color name

Returns:

  • (String) —

    the name of the color at the specified location in the color map



3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
 
# File 'ext/RMagick/rmimage.cpp', line 3246

VALUE
Image_colormap(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    unsigned long idx;
    PixelColor color, new_color;

    image = rm_check_destroyed(self);

    // We can handle either 1 or 2 arguments. Nothing else.
    if (argc == 0 || argc > 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
    }

    idx = NUM2ULONG(argv[0]);
    if (idx > QuantumRange)
    {
        rb_raise(rb_eIndexError, "index out of range");
    }

    // If this is a simple "get" operation, ensure the image has a colormap.
    if (argc == 1)
    {
        if (!image->colormap)
        {
            rb_raise(rb_eIndexError, "image does not contain a colormap");
        }
        // Validate the index

        if (idx > image->colors-1)
        {
            rb_raise(rb_eIndexError, "index out of range");
        }
        return rm_pixelcolor_to_color_name(image, &image->colormap[idx]);
    }

    // This is a "set" operation. Things are different.

    rb_check_frozen(self);

    // Replace with new color? The arg can be either a color name or
    // a Magick::Pixel.
    Color_to_PixelColor(&new_color, argv[1]);

    // Handle no colormap or current colormap too small.
    if (!image->colormap || idx > image->colors-1)
    {
        PixelColor black;
        unsigned long i;

        memset(&black, 0, sizeof(black));

        if (!image->colormap)
        {
            image->colormap = (PixelColor *)magick_safe_malloc((idx+1), sizeof(PixelColor));
            image->colors = 0;
        }
        else
        {
            image->colormap = (PixelColor *)magick_safe_realloc(image->colormap, (idx+1), sizeof(PixelColor));
        }

        for (i = image->colors; i < idx; i++)
        {
            image->colormap[i] = black;
        }
        image->colors = idx+1;
    }

    // Save the current color so we can return it. Set the new color.
    color = image->colormap[idx];
    image->colormap[idx] = new_color;

    return rm_pixelcolor_to_color_name(image, &color);
}

#colors ⇒ Numeric

Get the number of colors in the colormap.

Returns:

  • (Numeric) —

    the number of colors



3328
3329
3330
3331
3332
 
# File 'ext/RMagick/rmimage.cpp', line 3328

VALUE
Image_colors(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, colors, ulong, &rm_image_data_type);
}

#colorspace ⇒ Magick::ColorspaceType

Return the Image pixel interpretation. If the colorspace is RGB the pixels are red, green, blue. If matte is true, then red, green, blue, and index. If it is CMYK, the pixels are cyan, yellow, magenta, black. Otherwise the colorspace is ignored.

Returns:

  • (Magick::ColorspaceType) —

    the colorspace



3341
3342
3343
3344
3345
3346
3347
3348
 
# File 'ext/RMagick/rmimage.cpp', line 3341

VALUE
Image_colorspace(VALUE self)
{
    Image *image;

    image = rm_check_destroyed(self);
    return ColorspaceType_find(image->colorspace);
}

#colorspace=(colorspace) ⇒ Magick::ColorspaceType

Set the image’s colorspace.

Parameters:

  • colorspace (Magick::ColorspaceType) —

    the colorspace

Returns:

  • (Magick::ColorspaceType) —

    the given colorspace



3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
 
# File 'ext/RMagick/rmimage.cpp', line 3357

VALUE
Image_colorspace_eq(VALUE self, VALUE colorspace)
{
    Image *image;
    ColorspaceType new_cs;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);
    VALUE_TO_ENUM(colorspace, new_cs, ColorspaceType);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(TransformImageColorspace) args = { image, new_cs, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransformImageColorspace), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(TransformImageColorspace) args = { image, new_cs };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransformImageColorspace), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return colorspace;
}

#columns ⇒ Numeric

Get image columns.

Returns:

  • (Numeric) —

    the columns



3390
3391
3392
3393
3394
 
# File 'ext/RMagick/rmimage.cpp', line 3390

VALUE
Image_columns(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, columns, int, &rm_image_data_type);
}

#compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array #compare_channel(image, metric, channel = Magick::AllChannels) {|Magick::OptionalMethodArguments| ... } ⇒ Array #compare_channel(image, metric, *channels) ⇒ Array #compare_channel(image, metric, *channels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

Compare one or more channels in two images and returns the specified distortion metric and a comparison image.

Overloads:

  • #compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #compare_channel(image, metric, channel = Magick::AllChannels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

    When a block is given, compare_channel yields with a block argument you can optionally use to set attributes.

    • options.highlight_color = color

      • Emphasize pixel differences with this color. The default is partially transparent red.

    • options.lowlight_color = color

      • Demphasize pixel differences with this color. The default is partially transparent white.

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

    Yields:

  • #compare_channel(image, metric, *channels) ⇒ Array

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) —

      a ChannelType arguments.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #compare_channel(image, metric, *channels) {|Magick::OptionalMethodArguments| ... } ⇒ Array

    When a block is given, compare_channel yields with a block argument you can optionally use to set attributes.

    • options.highlight_color = color

      • Emphasize pixel differences with this color. The default is partially transparent red.

    • options.lowlight_color = color

      • Demphasize pixel differences with this color. The default is partially transparent white.

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) —

      a ChannelType arguments.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

    Yields:

Returns:

  • (Array) —

    The first element is a difference image, the second is a the value of the computed distortion represented as a Float.



3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
 
# File 'ext/RMagick/rmimage.cpp', line 3444

VALUE
Image_compare_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *r_image, *difference_image;
    double distortion;
    VALUE ary, ref;
    MetricType metric_type;
    ChannelType channels;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    if (argc > 2)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc != 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
    }

    rm_get_optional_arguments(self);

    ref = rm_cur_image(argv[0]);
    r_image = rm_check_destroyed(ref);

    VALUE_TO_ENUM(argv[1], metric_type, MetricType);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(CompareImages) args = { image, r_image, metric_type, &distortion, exception };
    difference_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImages), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(CompareImageChannels) args = { image, r_image, channels, metric_type, &distortion, exception };
    difference_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImageChannels), &args);
#endif
    rm_check_exception(exception, difference_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    ary = rb_ary_new2(2);
    rb_ary_store(ary, 0, rm_image_new(difference_image));
    rb_ary_store(ary, 1, rb_float_new(distortion));

    RB_GC_GUARD(ary);
    RB_GC_GUARD(ref);

    return ary;
}

#compose ⇒ Magick::CompositeOperator

Return the composite operator attribute.

Returns:

  • (Magick::CompositeOperator) —

    the composite operator



3503
3504
3505
3506
3507
3508
 
# File 'ext/RMagick/rmimage.cpp', line 3503

VALUE
Image_compose(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return CompositeOperator_find(image->compose);
}

#compose=(compose_arg) ⇒ Magick::CompositeOperator

Set the composite operator attribute.

Parameters:

  • compose_arg (Magick::CompositeOperator) —

    the composite operator

Returns:

  • (Magick::CompositeOperator) —

    the given value



3517
3518
3519
3520
3521
3522
3523
 
# File 'ext/RMagick/rmimage.cpp', line 3517

VALUE
Image_compose_eq(VALUE self, VALUE compose_arg)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(compose_arg, image->compose, CompositeOperator);
    return compose_arg;
}

#composite(image, x_off, y_off, composite_op) ⇒ Magick::Image #composite(image, gravity, composite_op) ⇒ Magick::Image #composite(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image

Composites src onto dest using the specified composite operator.

Overloads:

  • #composite(image, x_off, y_off, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

  • #composite(image, gravity, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

  • #composite(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator.

Returns:

See Also:



3790
3791
3792
3793
3794
 
# File 'ext/RMagick/rmimage.cpp', line 3790

VALUE
Image_composite(int argc, VALUE *argv, VALUE self)
{
    return composite(False, argc, argv, self, DefaultChannels);
}

#composite!(image, x_off, y_off, composite_op) ⇒ Magick::Image #composite!(image, gravity, composite_op) ⇒ Magick::Image #composite!(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image

Composites src onto dest using the specified composite operator. In-place form of #composite.

Overloads:

  • #composite!(image, x_off, y_off, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

  • #composite!(image, gravity, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

  • #composite!(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator.

Returns:

See Also:



3750
3751
3752
3753
3754
 
# File 'ext/RMagick/rmimage.cpp', line 3750

VALUE
Image_composite_bang(int argc, VALUE *argv, VALUE self)
{
    return composite(True, argc, argv, self, DefaultChannels);
}

#composite_affine(source, affine_matrix) ⇒ Magick::Image

Composite the source over the destination image as dictated by the affine transform.

Parameters:

  • source (Magick::Image) —

    the source image

  • affine_matrix (Magick::AffineMatrix) —

    affine transform matrix

Returns:



3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
 
# File 'ext/RMagick/rmimage.cpp', line 3804

VALUE
Image_composite_affine(VALUE self, VALUE source, VALUE affine_matrix)
{
    Image *image, *composite_image, *new_image;
    AffineMatrix affine;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    composite_image = rm_check_destroyed(source);

    Export_AffineMatrix(&affine, affine_matrix);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(DrawAffineImage) args = { new_image, composite_image, &affine, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DrawAffineImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(DrawAffineImage) args = { new_image, composite_image, &affine };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DrawAffineImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#composite_channel(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image #composite_channel(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, gravity, composite_op, *channels) ⇒ Magick::Image #composite_channel(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

Composite the source over the destination image channel as dictated by the affine transform.

Overloads:

  • #composite_channel(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #composite_channel(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel(image, gravity, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #composite_channel(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



3940
3941
3942
3943
3944
 
# File 'ext/RMagick/rmimage.cpp', line 3940

VALUE
Image_composite_channel(int argc, VALUE *argv, VALUE self)
{
    return composite_channel(False, argc, argv, self);
}

#composite_channel!(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image #composite_channel!(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, gravity, composite_op, *channels) ⇒ Magick::Image #composite_channel!(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

Composite the source over the destination image channel as dictated by the affine transform. In-place form of #composite_channel.

Overloads:

  • #composite_channel!(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel!(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #composite_channel!(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel!(image, gravity, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

  • #composite_channel!(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_channel!(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • gravity (Magick::GravityType) —

      A GravityType value that specifies the location of img on image.

    • x_off (Numeric) —

      the x-offset of the composited image, measured from the upper-left corner of the image.

    • y_off (Numeric) —

      the y-offset of the composited image, measured from the upper-left corner of the image.

    • composite_op (Magick::CompositeOperator) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



4015
4016
4017
4018
4019
 
# File 'ext/RMagick/rmimage.cpp', line 4015

VALUE
Image_composite_channel_bang(int argc, VALUE *argv, VALUE self)
{
    return composite_channel(True, argc, argv, self);
}

#composite_mathematics(image, a, b, c, d, gravity) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, x_off, y_off) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, gravity, x_off, y_off) ⇒ Magick::Image

Merge the source and destination images according to the formula

a*Sc*Dc + b*Sc + c*Dc + d

where Sc is the source pixel and Dc is the destination pixel.

Overloads:

  • #composite_mathematics(image, a, b, c, d, gravity) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Float) —

      See the description.

    • b (Float) —

      See the description.

    • c (Float) —

      See the description.

    • d (Float) —

      See the description.

    • gravity (Magick::GravityType) —

      the gravity type

  • #composite_mathematics(image, a, b, c, d, x_off, y_off) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Float) —

      See the description.

    • b (Float) —

      See the description.

    • c (Float) —

      See the description.

    • d (Float) —

      See the description.

    • x_off (Numeric) —

      The x-offset of the composited image, measured relative to the gravity argument.

    • y_off (Numeric) —

      The y-offset of the composited image, measured relative to the gravity argument.

  • #composite_mathematics(image, a, b, c, d, gravity, x_off, y_off) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Float) —

      See the description.

    • b (Float) —

      See the description.

    • c (Float) —

      See the description.

    • d (Float) —

      See the description.

    • gravity (Magick::GravityType) —

      the gravity type

    • x_off (Numeric) —

      The x-offset of the composited image, measured relative to the gravity argument.

    • y_off (Numeric) —

      The y-offset of the composited image, measured relative to the gravity argument.

Returns:



4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
 
# File 'ext/RMagick/rmimage.cpp', line 4063

VALUE
Image_composite_mathematics(int argc, VALUE *argv, VALUE self)
{
    Image *composite_image;
    VALUE args[5];
    signed long x_off = 0L;
    signed long y_off = 0L;
    GravityType gravity = NorthWestGravity;
    char compose_args[200];

    rm_check_destroyed(self);

    switch (argc)
    {
        case 8:
            VALUE_TO_ENUM(argv[5], gravity, GravityType);
            x_off = NUM2LONG(argv[6]);
            y_off = NUM2LONG(argv[7]);
            break;
        case 7:
            x_off = NUM2LONG(argv[5]);
            y_off = NUM2LONG(argv[6]);
            break;
        case 6:
            VALUE_TO_ENUM(argv[5], gravity, GravityType);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (got %d, expected 6 to 8)", argc);
            break;
    }

    composite_image = rm_check_destroyed(rm_cur_image(argv[0]));

    snprintf(compose_args, sizeof(compose_args), "%-.16g,%-.16g,%-.16g,%-.16g", NUM2DBL(argv[1]), NUM2DBL(argv[2]), NUM2DBL(argv[3]), NUM2DBL(argv[4]));
    SetImageArtifact(composite_image, "compose:args", compose_args);

    // Call composite(False, gravity, x_off, y_off, MathematicsCompositeOp, DefaultChannels)
    args[0] = argv[0];
    args[1] = GravityType_find(gravity);
    args[2] = LONG2FIX(x_off);
    args[3] = LONG2FIX(y_off);
    args[4] = CompositeOperator_find(MathematicsCompositeOp);

    return composite(False, 5, args, self, DefaultChannels);
}

#composite_tiled(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image #composite_tiled(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image

Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option.

Overloads:

  • #composite_tiled(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • src (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • composite_op (Magick::CompositeOperator) (defaults to: Magick::OverCompositeOp) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_tiled(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image

    Parameters:

    • src (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • composite_op (Magick::CompositeOperator) (defaults to: Magick::OverCompositeOp) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



4232
4233
4234
4235
4236
 
# File 'ext/RMagick/rmimage.cpp', line 4232

VALUE
Image_composite_tiled(int argc, VALUE *argv, VALUE self)
{
    return composite_tiled(False, argc, argv, self);
}

#composite_tiled!(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image #composite_tiled!(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image

Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option. In-place form of #composite_tiled.

Overloads:

  • #composite_tiled!(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • src (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • composite_op (Magick::CompositeOperator) (defaults to: Magick::OverCompositeOp) —

      the composite operator

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #composite_tiled!(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image

    Parameters:

    • src (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • composite_op (Magick::CompositeOperator) (defaults to: Magick::OverCompositeOp) —

      the composite operator

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



4259
4260
4261
4262
4263
 
# File 'ext/RMagick/rmimage.cpp', line 4259

VALUE
Image_composite_tiled_bang(int argc, VALUE *argv, VALUE self)
{
    return composite_tiled(True, argc, argv, self);
}

#compress_colormap! ⇒ Magick::Image

Removes duplicate or unused entries in the colormap. Only PseudoClass images have a colormap. If the image is DirectClass then compress_colormap! converts it to PseudoClass.

Returns:



4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
 
# File 'ext/RMagick/rmimage.cpp', line 4299

VALUE
Image_compress_colormap_bang(VALUE self)
{
    Image *image;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CompressImageColormap) args = { image, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompressImageColormap), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(CompressImageColormap) args = { image };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompressImageColormap), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(image, RetainOnError);
#endif
    if (!okay)
    {
        rb_warning("CompressImageColormap failed (probably DirectClass image)");
    }

    return self;
}

#compression ⇒ Magick::CompressionType

Get the compression attribute.

Returns:

  • (Magick::CompressionType) —

    the compression



4271
4272
4273
4274
4275
4276
 
# File 'ext/RMagick/rmimage.cpp', line 4271

VALUE
Image_compression(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return CompressionType_find(image->compression);
}

#compression=(compression) ⇒ Magick::CompressionType

Set the compression attribute.

Parameters:

  • compression (Magick::CompressionType) —

    the compression

Returns:

  • (Magick::CompressionType) —

    the given compression



4284
4285
4286
4287
4288
4289
4290
 
# File 'ext/RMagick/rmimage.cpp', line 4284

VALUE
Image_compression_eq(VALUE self, VALUE compression)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(compression, image->compression, CompressionType);
    return compression;
}

#contrast(sharpen = false) ⇒ Magick::Image

Enhance the intensity differences between the lighter and darker elements of the image.

Returns a new image.

Parameters:

  • sharpen (Boolean) (defaults to: false) —

    If sharpen is true, the contrast is increased, otherwise it is reduced.

Returns:



4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
 
# File 'ext/RMagick/rmimage.cpp', line 4517

VALUE
Image_contrast(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType sharpen = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }
    else if (argc == 1)
    {
        sharpen = (MagickBooleanType)RTEST(argv[0]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ContrastImage) args = { new_image, sharpen, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ContrastImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ContrastImage) args = { new_image, sharpen };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ContrastImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#contrast_stretch_channel(black_point, white_point = pixels-black_point, channel = Magick::AllChannels) ⇒ Magick::Image #contrast_stretch_channel(black_point, white_point = pixels-black_point, *channels) ⇒ Magick::Image

This method is a simple image enhancement technique that attempts to improve the contrast in an image by ‘stretching’ the range of intensity values it contains to span a desired range of values. It differs from the more sophisticated histogram equalization in that it can only apply a linear scaling function to the image pixel values.

Overloads:

  • #contrast_stretch_channel(black_point, white_point = pixels-black_point, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • black_point (Float, String) —

      black out at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’.

    • white_point (Float, String) (defaults to: pixels-black_point) —

      burn at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’. This argument is optional. If not specified the default is ‘(columns * rows) - black_point`.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #contrast_stretch_channel(black_point, white_point = pixels-black_point, *channels) ⇒ Magick::Image

    Parameters:

    • black_point (Float, String) —

      black out at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’.

    • white_point (Float, String) (defaults to: pixels-black_point) —

      burn at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’. This argument is optional. If not specified the default is all pixels - black_point pixels.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
 
# File 'ext/RMagick/rmimage.cpp', line 4642

VALUE
Image_contrast_stretch_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double black_point, white_point;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 2)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    get_black_white_point(image, argc, argv, &black_point, &white_point);

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(ContrastStretchImage) args = { new_image, black_point, white_point, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ContrastStretchImage), &args);
    END_CHANNEL_MASK(new_image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ContrastStretchImageChannel) args = { new_image, channels, black_point, white_point };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ContrastStretchImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#convolve(order_arg, kernel_arg) ⇒ Magick::Image

Apply a custom convolution kernel to the image.

Parameters:

  • order_arg (Numeric) —

    the number of rows and columns in the kernel

  • kernel_arg (Array<Float>) —

    An ‘order*order` matrix of Float values.

Returns:



4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
 
# File 'ext/RMagick/rmimage.cpp', line 4817

VALUE
Image_convolve(VALUE self, VALUE order_arg, VALUE kernel_arg)
{
    Image *image, *new_image;
    size_t order;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    KernelInfo *kernel;
#else
    double *kernel;
    unsigned int x;
#endif

    image = rm_check_destroyed(self);

    if (NUM2INT(order_arg) <= 0)
    {
        rb_raise(rb_eArgError, "order must be non-zero and positive");
    }

    order = NUM2INT(order_arg);
    kernel_arg = rb_Array(kernel_arg);
    rm_check_ary_len(kernel_arg, (long)(order*order));

#if defined(IMAGEMAGICK_7)
    kernel = convolve_create_kernel_info(order, kernel_arg);
#else
    // Convert the kernel array argument to an array of doubles

    kernel = (double *)ALLOC_N(double, order*order);
    for (x = 0; x < (unsigned)(order * order); x++)
    {
        VALUE element = rb_ary_entry(kernel_arg, (long)x);
        if (rm_check_num2dbl(element))
        {
            kernel[x] = NUM2DBL(element);
        }
        else
        {
            xfree((void *)kernel);
            rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
        }
    }
#endif

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(ConvolveImage) args = { image, kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ConvolveImage), &args);
    DestroyKernelInfo(kernel);
#else
    GVL_STRUCT_TYPE(ConvolveImage) args = { image, order, kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ConvolveImage), &args);
    xfree((void *)kernel);
#endif

    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#convolve_channel(order, kernel, channel = Magick::AllChannels) ⇒ Magick::Image #convolve_channel(order, kernel, *channels) ⇒ Magick::Image

Applies a custom convolution kernel to the specified channel or channels in the image.

Overloads:

  • #convolve_channel(order, kernel, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • order_arg (Numeric) —

      the number of rows and columns in the kernel

    • kernel_arg (Array<Float>) —

      An ‘order*order` matrix of Float values.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #convolve_channel(order, kernel, *channels) ⇒ Magick::Image

    Parameters:

    • order_arg (Numeric) —

      the number of rows and columns in the kernel

    • kernel_arg (Array<Float>) —

      An ‘order*order` matrix of Float values.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
 
# File 'ext/RMagick/rmimage.cpp', line 4896

VALUE
Image_convolve_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    VALUE ary;
    size_t order;
    ChannelType channels;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    KernelInfo *kernel;
#else
    double *kernel;
    unsigned int x;
#endif

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // There are 2 required arguments.
    if (argc > 2)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc != 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
    }

    if (NUM2INT(argv[0]) <= 0)
    {
        rb_raise(rb_eArgError, "order must be non-zero and positive");
    }

    order = NUM2INT(argv[0]);
    ary = rb_Array(argv[1]);
    rm_check_ary_len(ary, (long)(order*order));

#if defined(IMAGEMAGICK_7)
    kernel = convolve_create_kernel_info(order, ary);
#else
    kernel = ALLOC_N(double, (long)(order*order));

    // Convert the kernel array argument to an array of doubles
    for (x = 0; x < (unsigned)(order * order); x++)
    {
        VALUE element = rb_ary_entry(ary, (long)x);
        if (rm_check_num2dbl(element))
        {
            kernel[x] = NUM2DBL(element);
        }
        else
        {
            xfree((void *)kernel);
            rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
        }
    }
#endif

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(ConvolveImage) args = { image, kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ConvolveImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
    DestroyKernelInfo(kernel);
#else
    GVL_STRUCT_TYPE(ConvolveImageChannel) args = { image, channels, order, kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ConvolveImageChannel), &args);
    xfree((void *)kernel);
#endif

    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    RB_GC_GUARD(ary);

    return rm_image_new(new_image);
}

#copy ⇒ Magick::Image

Alias for #dup.

Returns:



4985
4986
4987
4988
4989
 
# File 'ext/RMagick/rmimage.cpp', line 4985

VALUE
Image_copy(VALUE self)
{
    return rb_funcall(self, rm_ID_dup, 0);
}

#crop(x, y, width, height, reset = false) ⇒ Magick::Image #crop(gravity, width, height, reset = false) ⇒ Magick::Image #crop(gravity, x, y, width, height, reset = false) ⇒ Magick::Image

Extract a region of the image defined by width, height, x, y.

Overloads:

  • #crop(x, y, width, height, reset = false) ⇒ Magick::Image

    Parameters:

    • x (Numeric) —

      x position of start of region

    • y (Numeric) —

      y position of start of region

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

  • #crop(gravity, width, height, reset = false) ⇒ Magick::Image

    Parameters:

    • gravity (Magick::GravityType) —

      the gravity type

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

  • #crop(gravity, x, y, width, height, reset = false) ⇒ Magick::Image

    Parameters:

    • gravity (Magick::GravityType) —

      the gravity type

    • x (Numeric) —

      x position of start of region

    • y (Numeric) —

      y position of start of region

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

Returns:

See Also:



5040
5041
5042
5043
5044
5045
 
# File 'ext/RMagick/rmimage.cpp', line 5040

VALUE
Image_crop(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return cropper(False, argc, argv, self);
}

#crop!(reset = false, x, y, width, height) ⇒ Magick::Image #crop!(reset = false, gravity, width, height) ⇒ Magick::Image #crop!(reset = false, gravity, x, y, width, height) ⇒ Magick::Image

Extract a region of the image defined by width, height, x, y. In-place form of #crop.

Overloads:

  • #crop!(reset = false, x, y, width, height) ⇒ Magick::Image

    Parameters:

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

    • x (Numeric) —

      x position of start of region

    • y (Numeric) —

      y position of start of region

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

  • #crop!(reset = false, gravity, width, height) ⇒ Magick::Image

    Parameters:

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

    • gravity (Magick::GravityType) —

      the gravity type

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

  • #crop!(reset = false, gravity, x, y, width, height) ⇒ Magick::Image

    Parameters:

    • reset (Boolean) (defaults to: false) —

      true if reset the cropped image page canvas and position

    • gravity (Magick::GravityType) —

      the gravity type

    • x (Numeric) —

      x position of start of region

    • y (Numeric) —

      y position of start of region

    • width (Numeric) —

      width of region

    • height (Numeric) —

      height of region

Returns:

See Also:



5076
5077
5078
5079
5080
5081
 
# File 'ext/RMagick/rmimage.cpp', line 5076

VALUE
Image_crop_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return cropper(True, argc, argv, self);
}

#cur_image ⇒ Object

Used by ImageList methods - see ImageList#cur_image



827
828
829
 
# File 'lib/rmagick_internal.rb', line 827

def cur_image
  self
end

#cycle_colormap(amount) ⇒ Magick::Image

Displaces the colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychedelic effect.

The returned image is always a PseudoClass image, regardless of the type of the original image.

Parameters:

  • amount (Numeric) —

    amount to cycle the colormap

Returns:



5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
 
# File 'ext/RMagick/rmimage.cpp', line 5093

VALUE
Image_cycle_colormap(VALUE self, VALUE amount)
{
    Image *image, *new_image;
    int amt;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    amt = NUM2INT(amount);

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CycleColormapImage) args = { new_image, amt, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CycleColormapImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(CycleColormapImage) args = { new_image, amt };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CycleColormapImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#decipher(passphrase) ⇒ Magick::Image

Decipher an enciphered image.

Parameters:

  • passphrase (String) —

    The passphrase used to encipher the image.

Returns:



5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
 
# File 'ext/RMagick/rmimage.cpp', line 5236

VALUE
Image_decipher(VALUE self, VALUE passphrase)
{
    Image *image, *new_image;
    char *pf;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    pf = StringValueCStr(passphrase);      // ensure passphrase is a string
    exception = AcquireExceptionInfo();

    new_image = rm_clone_image(image);

    GVL_STRUCT_TYPE(DecipherImage) args = { new_image, pf, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DecipherImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    if (!okay)
    {
        DestroyImage(new_image);
        rb_raise(rb_eRuntimeError, "DecipherImage failed for unknown reason.");
    }

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#define(artifact, value) ⇒ String

Associates makes a copy of the given string arguments and inserts it into the artifact tree.

  • Normally a script should never call this method. Any calls to SetImageArtifact will be part of the methods in which they’re needed, or be called via the OptionalMethodArguments class.

  • If value is nil, the artifact will be removed

Parameters:

  • artifact (String) —

    the artifact to set

  • value (String) —

    the value to which to set the artifact

Returns:

  • (String) —

    the given ‘value`



5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
 
# File 'ext/RMagick/rmimage.cpp', line 5279

VALUE
Image_define(VALUE self, VALUE artifact, VALUE value)
{
    Image *image;
    char *key, *val;
    MagickBooleanType status;

    image = rm_check_frozen(self);
    artifact = rb_String(artifact);
    key = StringValueCStr(artifact);

    if (value == Qnil)
    {
        DeleteImageArtifact(image, key);
    }
    else
    {
        value = rb_String(value);
        val = StringValueCStr(value);
        status = SetImageArtifact(image, key, val);
        if (!status)
        {
            rb_raise(rb_eNoMemError, "not enough memory to continue");
        }
    }

    return value;
}

#delay ⇒ Numeric

Get the Number of ticks which must expire before displaying the next image in an animated sequence. The default number of ticks is 0. By default there are 100 ticks per second but this number can be changed via the ticks_per_second attribute.

Returns:

  • (Numeric) —

    The current delay value.



5316
5317
5318
5319
5320
 
# File 'ext/RMagick/rmimage.cpp', line 5316

VALUE
Image_delay(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, delay, ulong, &rm_image_data_type);
}

#delay=(val) ⇒ Numeric

Set the Number of ticks which must expire before displaying the next image in an animated sequence.

Parameters:

  • val (Numeric) —

    the delay value

Returns:

  • (Numeric) —

    the given value



5329
5330
5331
5332
5333
 
# File 'ext/RMagick/rmimage.cpp', line 5329

VALUE
Image_delay_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, delay, ulong, &rm_image_data_type);
}

#delete_compose_mask ⇒ Magick::Image

Delete the image composite mask.

Returns:

See Also:



5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
 
# File 'ext/RMagick/rmimage.cpp', line 5342

VALUE
Image_delete_compose_mask(VALUE self)
{
    Image *image;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageMask) args = { image, CompositePixelMask, NULL, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageMask), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageMask) args = { image, NULL };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageMask), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#delete_profile(name) ⇒ Magick::Image

Deletes the specified profile.

Parameters:

  • name (String) —

    The profile name, “IPTC” or “ICC” for example. Specify “*” to delete all the profiles in the image.

Returns:

See Also:



5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
 
# File 'ext/RMagick/rmimage.cpp', line 5376

VALUE
Image_delete_profile(VALUE self, VALUE name)
{
    Image *image = rm_check_frozen(self);

#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(ProfileImage) args = { image, StringValueCStr(name), NULL, 0, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ProfileImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ProfileImage) args = { image, StringValueCStr(name), NULL, 0, MagickTrue };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ProfileImage), &args);
#endif
    return self;
}

#density ⇒ String

Get the vertical and horizontal resolution in pixels of the image. The default is “72x72”.

Returns:

  • (String) —

    a string of geometry in the form “XresxYres”

See Also:



5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
 
# File 'ext/RMagick/rmimage.cpp', line 5130

VALUE
Image_density(VALUE self)
{
    Image *image;
    char density[128];

    image = rm_check_destroyed(self);

#if defined(IMAGEMAGICK_7)
    snprintf(density, sizeof(density), "%gx%g", image->resolution.x, image->resolution.y);
#else
    snprintf(density, sizeof(density), "%gx%g", image->x_resolution, image->y_resolution);
#endif
    return rb_str_new2(density);
}

#density=(density_arg) ⇒ String, Magick::Geometry

Set the vertical and horizontal resolution in pixels of the image.

  • The density is a string of the form “XresxYres” or simply “Xres”.

  • If the y resolution is not specified, set it equal to the x resolution.

  • This is equivalent to PerlMagick’s handling of density.

  • The density can also be a Geometry object. The width attribute is used for the x resolution. The height attribute is used for the y resolution. If the height attribute is missing, the width attribute is used for both.

Parameters:

Returns:

See Also:



5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
 
# File 'ext/RMagick/rmimage.cpp', line 5161

VALUE
Image_density_eq(VALUE self, VALUE density_arg)
{
    Image *image;
    char *density;
    VALUE x_val, y_val;
    int count;
    double x_res, y_res;

    image = rm_check_frozen(self);

    // Get the Class ID for the Geometry class.
    if (!Class_Geometry)
    {
        Class_Geometry = rb_const_get(Module_Magick, rm_ID_Geometry);
    }

    // Geometry object. Width and height attributes are always positive.
    if (CLASS_OF(density_arg) == Class_Geometry)
    {
        x_val = rb_funcall(density_arg, rm_ID_width, 0);
        x_res = NUM2DBL(x_val);
        y_val = rb_funcall(density_arg, rm_ID_height, 0);
        y_res = NUM2DBL(y_val);
        if (x_res == 0.0)
        {
            rb_raise(rb_eArgError, "invalid x resolution: %f", x_res);
        }
#if defined(IMAGEMAGICK_7)
        image->resolution.y = y_res != 0.0 ? y_res : x_res;
        image->resolution.x = x_res;
#else
        image->y_resolution = y_res != 0.0 ? y_res : x_res;
        image->x_resolution = x_res;
#endif
    }

    // Convert the argument to a string
    else
    {
        density = StringValueCStr(density_arg);
        if (!IsGeometry(density))
        {
            rb_raise(rb_eArgError, "invalid density geometry %s", density);
        }

#if defined(IMAGEMAGICK_7)
        count = sscanf(density, "%lfx%lf", &image->resolution.x, &image->resolution.y);
#else
        count = sscanf(density, "%lfx%lf", &image->x_resolution, &image->y_resolution);
#endif
        if (count < 2)
        {
#if defined(IMAGEMAGICK_7)
            image->resolution.y = image->resolution.x;
#else
            image->y_resolution = image->x_resolution;
#endif
        }

    }

    RB_GC_GUARD(x_val);
    RB_GC_GUARD(y_val);

    return density_arg;
}

#depth ⇒ Numeric

Return the image depth (8, 16 or 32).

  • If all pixels have lower-order bytes equal to higher-order bytes, the depth will be reported as 8 even if the depth field in the Image structure says 16.

Returns:

  • (Numeric) —

    the depth



5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
 
# File 'ext/RMagick/rmimage.cpp', line 5404

VALUE
Image_depth(VALUE self)
{
    Image *image;
    size_t depth = 0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(GetImageDepth) args = { image, exception };
    depth = (size_t)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageDepth), &args);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return INT2FIX(depth);
}

#deskew(threshold = 0.40, auto_crop_width = nil) ⇒ Magick::Image

Straightens an image. A threshold of 40% works for most images.

Returns a new image.

Parameters:

  • threshold (Float) (defaults to: 0.40) —

    A percentage of QuantumRange. Either a Float between 0 and 1.0, inclusive, or a string in the form “NN%” where NN is between 0 and 100.

  • auto_crop_width (Float) (defaults to: nil) —

    Specify a value for this argument to cause the deskewed image to be auto-cropped. The argument is the pixel width of the image background (e.g. 40).

Returns:



5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
 
# File 'ext/RMagick/rmimage.cpp', line 5434

VALUE
Image_deskew(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double threshold = 40.0 * QuantumRange / 100.0;
    unsigned long width;
    char auto_crop_width[20];
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            width = NUM2ULONG(argv[1]);
            memset(auto_crop_width, 0, sizeof(auto_crop_width));
            snprintf(auto_crop_width, sizeof(auto_crop_width), "%lu", width);
            SetImageArtifact(image, "deskew:auto-crop", auto_crop_width);
        case 1:
            threshold = rm_percentage(argv[0], 1.0) * QuantumRange;
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(DeskewImage) args = { image, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DeskewImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#despeckle ⇒ Magick::Image

Reduce the speckle noise in an image while preserving the edges of the original image.

Returns:



5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
 
# File 'ext/RMagick/rmimage.cpp', line 5476

VALUE
Image_despeckle(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(DespeckleImage) args = { image, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DespeckleImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#destroy! ⇒ Magick::Image

Free all the memory associated with an image.

Returns:



5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
 
# File 'ext/RMagick/rmimage.cpp', line 5499

VALUE
Image_destroy_bang(VALUE self)
{
    Image *image;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Image, &rm_image_data_type, image);
    rm_image_destroy(image);
    DATA_PTR(self) = NULL;
    return self;
}

#destroyed? ⇒ Boolean

Return true if the image has been destroyed, false otherwise.

Returns:

  • (Boolean) —

    true if destroyed, false otherwise



5517
5518
5519
5520
5521
5522
5523
5524
 
# File 'ext/RMagick/rmimage.cpp', line 5517

VALUE
Image_destroyed_q(VALUE self)
{
    Image *image;

    TypedData_Get_Struct(self, Image, &rm_image_data_type, image);
    return image ? Qfalse : Qtrue;
}

#difference(other) ⇒ Array<Float>

Compares two images and computes statistics about their difference.

Parameters:

Returns:

  • (Array<Float>) —

    An array of three Float values:

    • mean error per pixel

      • The mean error for any single pixel in the image.

    • normalized mean error

      • The normalized mean quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in the image.

    • normalized maximum error

      • The normalized maximum quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in your image.



5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
 
# File 'ext/RMagick/rmimage.cpp', line 5544

VALUE
Image_difference(VALUE self, VALUE other)
{
    Image *image;
    Image *image2;
    VALUE mean, nmean, nmax;
#if defined(IMAGEMAGICK_7)
    double distortion;
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    other = rm_cur_image(other);
    image2 = rm_check_destroyed(other);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(GetImageDistortion) args = { image, image2, MeanErrorPerPixelErrorMetric, &distortion, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageDistortion), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(IsImagesEqual) args = { image, image2 };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(IsImagesEqual), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    mean  = rb_float_new(image->error.mean_error_per_pixel);
    nmean = rb_float_new(image->error.normalized_mean_error);
    nmax  = rb_float_new(image->error.normalized_maximum_error);

    RB_GC_GUARD(mean);
    RB_GC_GUARD(nmean);
    RB_GC_GUARD(nmax);

    return rb_ary_new3(3, mean, nmean, nmax);
}

#directory ⇒ String

Get image directory.

Returns:

  • (String) —

    the directory



5588
5589
5590
5591
5592
 
# File 'ext/RMagick/rmimage.cpp', line 5588

VALUE
Image_directory(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, directory, str, &rm_image_data_type);
}

#dispatch(x, y, columns, rows, map, float = false) ⇒ Array<Numeric>

Extract pixel data from the image and returns it as an array of pixels. The “x”, “y”, “width” and “height” parameters specify the rectangle to be extracted. The “map” parameter reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, or I = intensity (for grayscale). If the “float” parameter is specified and true, the pixel data is returned as floating-point numbers in the range [0..1]. By default the pixel data is returned as integers in the range [0..QuantumRange].

Returns an Array of pixel data.

Parameters:

  • x (Numeric) —

    The offset of the rectangle from the upper-left corner of the image.

  • y (Numeric) —

    The offset of the rectangle from the upper-left corner of the image.

  • columns (Numeric) —

    The width of the rectangle.

  • rows (Numeric) —

    The height of the rectangle.

  • map (String)
  • float (Boolean) (defaults to: false)

Returns:

  • (Array<Numeric>) —

    an Array of pixel data



5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
 
# File 'ext/RMagick/rmimage.cpp', line 5672

VALUE
Image_dispatch(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    long x, y;
    unsigned long columns, rows, n, npixels;
    VALUE pixels_ary;
    StorageType stg_type = QuantumPixel;
    char *map;
    size_t mapL;
    MagickBooleanType okay;
    ExceptionInfo *exception;
    volatile union
    {
        Quantum *i;
        double *f;
        void *v;
    } pixels;

    rm_check_destroyed(self);

    if (argc < 5 || argc > 6)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 5 or 6)", argc);
    }

    x       = NUM2LONG(argv[0]);
    y       = NUM2LONG(argv[1]);
    columns = NUM2ULONG(argv[2]);
    rows    = NUM2ULONG(argv[3]);
    map     = rm_str2cstr(argv[4], &mapL);
    if (argc == 6)
    {
        stg_type = RTEST(argv[5]) ? DoublePixel : QuantumPixel;
    }

    // Compute the size of the pixel array and allocate the memory.
    npixels = columns * rows * mapL;
    pixels.v = stg_type == QuantumPixel ? (void *) ALLOC_N(Quantum, npixels)
               : (void *) ALLOC_N(double, npixels);

    // Create the Ruby array for the pixels. Return this even if ExportImagePixels fails.
    pixels_ary = rb_ary_new();

    TypedData_Get_Struct(self, Image, &rm_image_data_type, image);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ExportImagePixels) args = { image, x, y, columns, rows, map, stg_type, (void *)pixels.v, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ExportImagePixels), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));

    if (!okay)
    {
        goto exit;
    }

    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    // Convert the pixel data to the appropriate Ruby type
    if (stg_type == QuantumPixel)
    {
        for (n = 0; n < npixels; n++)
        {
            rb_ary_push(pixels_ary, QUANTUM2NUM(pixels.i[n]));
        }
    }
    else
    {
        for (n = 0; n < npixels; n++)
        {
            rb_ary_push(pixels_ary, rb_float_new(pixels.f[n]));
        }
    }

    exit:
    xfree((void *)pixels.v);

    RB_GC_GUARD(pixels_ary);

    return pixels_ary;
}

#displace(displacement_map, x_amp, y_amp = x_amp, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image

Uses displacement_map to move color from img to the output image. This method corresponds to the -displace option of ImageMagick’s composite command.

NorthWest corner by default.

Parameters:

  • displacement_map (Magick::Image, Magick::ImageList) —

    The source image for the composite operation. Either an imagelist or an image. If an imagelist, uses the current image.

  • x_amp (Float) —

    The maximum displacement on the x-axis.

  • y_amp (Float) (defaults to: x_amp) —

    The maximum displacement on the y-axis.

  • gravity (Magick::GravityType) (defaults to: Magick::NorthWestGravity) —

    the gravity for offset. the offsets are measured from the

  • x_offset (Numeric) (defaults to: 0) —

    The offset that measured from the left-hand side of the target image.

  • y_offset (Numeric) (defaults to: 0) —

    The offset that measured from the top of the target image.

Returns:



5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
 
# File 'ext/RMagick/rmimage.cpp', line 5610

VALUE
Image_displace(int argc, VALUE *argv, VALUE self)
{
    Image *image, *displacement_map;
    VALUE dmap;
    double x_amplitude = 0.0, y_amplitude = 0.0;
    long x_offset = 0L, y_offset = 0L;

    image = rm_check_destroyed(self);

    if (argc < 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
    }

    dmap = rm_cur_image(argv[0]);
    displacement_map = rm_check_destroyed(dmap);

    if (argc > 3)
    {
        get_composite_offsets(argc-3, &argv[3], image, displacement_map, &x_offset, &y_offset);
        // There must be 3 arguments left
        argc = 3;
    }

    switch (argc)
    {
        case 3:
            y_amplitude = NUM2DBL(argv[2]);
            x_amplitude = NUM2DBL(argv[1]);
            break;
        case 2:
            x_amplitude = NUM2DBL(argv[1]);
            y_amplitude = x_amplitude;
            break;
    }

    RB_GC_GUARD(dmap);

    return special_composite(image, displacement_map, x_amplitude, y_amplitude,
                             x_offset, y_offset, DisplaceCompositeOp);
}

#display ⇒ Magick::Image Also known as: __display__

Display the image to an X window screen.

Returns:



5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
 
# File 'ext/RMagick/rmimage.cpp', line 5762

VALUE
Image_display(VALUE self)
{
    Image *image;
    Info *info;
    VALUE info_obj;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    if (image->rows == 0 || image->columns == 0)
    {
        rb_raise(rb_eArgError, "invalid image geometry (%" RMIuSIZE "x%" RMIuSIZE ")", image->rows, image->columns);
    }

    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    DisplayImages(info, image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    DisplayImages(info, image);
    rm_check_image_exception(image, RetainOnError);
#endif

    RB_GC_GUARD(info_obj);

    return self;
}

#dispose ⇒ Magick::DisposeType

Return the dispose attribute as a DisposeType enum.

Returns:

  • (Magick::DisposeType) —

    the dispose



5803
5804
5805
5806
5807
5808
 
# File 'ext/RMagick/rmimage.cpp', line 5803

VALUE
Image_dispose(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return DisposeType_find(image->dispose);
}

#dispose=(dispose) ⇒ Magick::DisposeType

Set the dispose attribute.

Parameters:

  • dispose (Magick::DisposeType) —

    the dispose

Returns:

  • (Magick::DisposeType) —

    the given dispose



5817
5818
5819
5820
5821
5822
5823
 
# File 'ext/RMagick/rmimage.cpp', line 5817

VALUE
Image_dispose_eq(VALUE self, VALUE dispose)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(dispose, image->dispose, DisposeType);
    return dispose;
}

#dissolve(overlay, src_percent, dst_percent = -1.0, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image

Composites the overlay image into the target image. The opacity of img is multiplied by dst_percentage and opacity of overlay is multiplied by src_percentage.

This method corresponds to the -dissolve option of ImageMagick’s composite command.

Returns a new image.

Parameters:

  • overlay (Magick::Image, Magick::ImageList) —

    The source image for the composite operation. Either an imagelist or an image. If an imagelist, uses the current image.

  • src_percent (Float, String) —

    Either a non-negative number a string in the form “NN%”. If src_percentage is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. This argument is required.

  • dst_percent (Float, String) (defaults to: -1.0) —

    Either a non-negative number a string in the form “NN%”. If src_percentage is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. This argument may omitted if no other arguments follow it. In this case the default is 100%-src_percentage.

  • gravity (Magick::GravityType) (defaults to: Magick::NorthWestGravity) —

    the gravity for offset. the offsets are measured from the NorthWest corner by default.

  • x_offset (Numeric) (defaults to: 0) —

    The offset that measured from the left-hand side of the target image.

  • y_offset (Numeric) (defaults to: 0) —

    The offset that measured from the top of the target image.

Returns:



5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
 
# File 'ext/RMagick/rmimage.cpp', line 5849

VALUE
Image_dissolve(int argc, VALUE *argv, VALUE self)
{
    Image *image, *overlay;
    double src_percent, dst_percent = -1.0;
    long x_offset = 0L, y_offset = 0L;
    VALUE composite_image, ovly;

    image = rm_check_destroyed(self);

    if (argc < 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
    }

    ovly = rm_cur_image(argv[0]);
    overlay = rm_check_destroyed(ovly);

    if (argc > 3)
    {
        get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
        // There must be 3 arguments left
        argc = 3;
    }

    switch (argc)
    {
        case 3:
            dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
        case 2:
            src_percent = rm_percentage(argv[1], 1.0) * 100.0;
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
            break;
    }

    composite_image =  special_composite(image, overlay, src_percent, dst_percent,
                                         x_offset, y_offset, DissolveCompositeOp);

    RB_GC_GUARD(composite_image);
    RB_GC_GUARD(ovly);

    return composite_image;
}

#distort(type, points, bestfit = false) ⇒ Magick::Image #distort(type, points, bestfit = false) {|Magick::OptionalMethodArguments| ... } ⇒ Magick::Image

Distort an image using the specified distortion type and its required arguments. This method is equivalent to ImageMagick’s -distort option.

Examples:

img.distort(Magick::ScaleRotateTranslateDistortion, [0]) do |options|
  options.define "distort:viewport", "44x44+15+0"
  options.define "distort:scale", 2
end

Overloads:

  • #distort(type, points, bestfit = false) ⇒ Magick::Image

    Parameters:

    • type (Magick::DistortMethod) —

      a DistortMethod value

    • points (Array<Numeric>) —

      an Array of Numeric values. The size of the array depends on the distortion type.

    • bestfit (Boolean) (defaults to: false) —

      If bestfit is enabled, and the distortion allows it, the destination image is adjusted to ensure the whole source image will just fit within the final destination image, which will be sized and offset accordingly. Also in many cases the virtual offset of the source image will be taken into account in the mapping.

  • #distort(type, points, bestfit = false) {|Magick::OptionalMethodArguments| ... } ⇒ Magick::Image

    When a block is given, distort yields with a block argument you can optionally use to set attributes.

    • options.define(“distort:viewport”, “WxH+X+Y”)

      • Specify the size and offset of the generated viewport image of the distorted image space. W and H are the width and height, and X and Y are the offset.

    • options.define(“distort:scale”, N)

      • N is an integer factor. Scale the output image (viewport or otherwise) by that factor without changing the viewed contents of the distorted image. This can be used either for ‘super-sampling’ the image for a higher quality result, or for panning and zooming around the image (with appropriate viewport changes, or post-distort cropping and resizing).

    • options.verbose(true)

      • Attempt to output the internal coefficients, and the -fx equivalent to the distortion, for

        expert study, and debugging purposes. This many not be available for all distorts.

    Parameters:

    • type (Magick::DistortMethod) —

      a DistortMethod value

    • points (Array<Numeric>) —

      an Array of Numeric values. The size of the array depends on the distortion type.

    • bestfit (Boolean) (defaults to: false) —

      If bestfit is enabled, and the distortion allows it, the destination image is adjusted to ensure the whole source image will just fit within the final destination image, which will be sized and offset accordingly. Also in many cases the virtual offset of the source image will be taken into account in the mapping.

    Yields:

Returns:



5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
 
# File 'ext/RMagick/rmimage.cpp', line 5937

VALUE
Image_distort(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    VALUE pts;
    unsigned long n, npoints;
    DistortMethod distortion_method;
    double *points;
    MagickBooleanType bestfit = MagickFalse;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    rm_get_optional_arguments(self);

    switch (argc)
    {
        case 3:
            bestfit = (MagickBooleanType)RTEST(argv[2]);
        case 2:
            // Ensure pts is an array
            pts = rb_Array(argv[1]);
            VALUE_TO_ENUM(argv[0], distortion_method, DistortMethod);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (expected 2 or 3, got %d)", argc);
            break;
    }

    npoints = RARRAY_LEN(pts);
    points = ALLOC_N(double, npoints);

    for (n = 0; n < npoints; n++)
    {
        VALUE element = rb_ary_entry(pts, n);
        if (rm_check_num2dbl(element))
        {
            points[n] = NUM2DBL(element);
        }
        else
        {
            xfree(points);
            rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
        }
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(DistortImage) args = { image, distortion_method, npoints, points, bestfit, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DistortImage), &args);
    xfree(points);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    RB_GC_GUARD(pts);

    return rm_image_new(new_image);
}

#distortion_channel(reconstructed_image, metric, channel = Magick::AllChannels) ⇒ Float #distortion_channel(reconstructed_image, metric, *channels) ⇒ Float

Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.

Overloads:

  • #distortion_channel(reconstructed_image, metric, channel = Magick::AllChannels) ⇒ Float

    Parameters:

    • reconstructed_image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #distortion_channel(reconstructed_image, metric, *channels) ⇒ Float

    Parameters:

    • reconstructed_image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • metric (Magick::MetricType) —

      The desired distortion metric.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

  • (Float) —

    the image channel distortion



6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
 
# File 'ext/RMagick/rmimage.cpp', line 6013

VALUE
Image_distortion_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *reconstruct;
    ChannelType channels;
    ExceptionInfo *exception;
    MetricType metric;
    VALUE rec;
    double distortion;
#if defined(IMAGEMAGICK_7)
    Image *difference_image;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 2)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc < 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
    }

    rec = rm_cur_image(argv[0]);
    reconstruct = rm_check_destroyed(rec);
    VALUE_TO_ENUM(argv[1], metric, MetricType);
    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(CompareImages) args = { image, reconstruct, metric, &distortion, exception };
    difference_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImages), &args);
    END_CHANNEL_MASK(image);
    DestroyImage(difference_image);
#else
    GVL_STRUCT_TYPE(GetImageChannelDistortion) args = { image, reconstruct, channels, metric, &distortion, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetImageChannelDistortion), &args);
#endif

    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(rec);

    return rb_float_new(distortion);
}

#dup ⇒ Magick::Image

Duplicates a image.

Returns:



6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
 
# File 'ext/RMagick/rmimage.cpp', line 6130

VALUE
Image_dup(VALUE self)
{
    VALUE dup;

    rm_check_destroyed(self);
    dup = TypedData_Wrap_Struct(CLASS_OF(self), &rm_image_data_type, NULL);
    RB_GC_GUARD(dup);

    return rb_funcall(dup, rm_ID_initialize_copy, 1, self);
}

#each_iptc_dataset ⇒ Object

Iterate over IPTC record number:dataset tags, yield for each non-nil dataset



887
888
889
890
891
892
893
894
895
896
 
# File 'lib/rmagick_internal.rb', line 887

def each_iptc_dataset
  Magick::IPTC.constants.each do |record|
    rec = Magick::IPTC.const_get(record)
    rec.constants.each do |dataset|
      data_field = get_iptc_dataset(rec.const_get(dataset))
      yield(dataset, data_field) unless data_field.nil?
    end
  end
  nil
end

#each_pixel ⇒ Object

Thanks to Russell Norris!



832
833
834
835
836
837
 
# File 'lib/rmagick_internal.rb', line 832

def each_pixel
  get_pixels(0, 0, columns, rows).each_with_index do |p, n|
    yield(p, n % columns, n / columns)
  end
  self
end

#each_profile {|name, val| ... } ⇒ Object

Calls block once for each profile in the image, passing the profile name and value as parameters.

Yields:

  • (name, val)

Yield Parameters:

  • name (String) —

    the profile name

  • val (String) —

    the profile value

Returns:

  • (Object) —

    the last value returned by the block



6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
 
# File 'ext/RMagick/rmimage.cpp', line 6151

VALUE
Image_each_profile(VALUE self)
{
    Image *image;
    VALUE ary;
    VALUE val = Qnil;
    char *name;
    const StringInfo *profile;

    image = rm_check_destroyed(self);
    ResetImageProfileIterator(image);

    ary = rb_ary_new2(2);

    name = GetNextImageProfile(image);
    while (name)
    {
        rb_ary_store(ary, 0, rb_str_new2(name));

        profile = GetImageProfile(image, name);
        if (!profile)
        {
            rb_ary_store(ary, 1, Qnil);
        }
        else
        {
            rb_ary_store(ary, 1, rb_str_new((char *)profile->datum, (long)profile->length));
        }
        val = rb_yield(ary);
        name = GetNextImageProfile(image);
    }

    RB_GC_GUARD(ary);
    RB_GC_GUARD(val);

    return val;
}

#edge(radius = 0.0) ⇒ Magick::Image

Find edges in an image. “radius” defines the radius of the convolution filter.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the convolution filter.

Returns:



6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
 
# File 'ext/RMagick/rmimage.cpp', line 6197

VALUE
Image_edge(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(EdgeImage) args = { image, radius, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EdgeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#emboss(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Adds a 3-dimensional effect.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian operator.

  • sigma (Float) (defaults to: 1.0) —

    The sigma (standard deviation) of the Gaussian operator.

Returns:



6286
6287
6288
6289
6290
 
# File 'ext/RMagick/rmimage.cpp', line 6286

VALUE
Image_emboss(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GVL_FUNC(EmbossImage));
}

#encipher(passphrase) ⇒ Magick::Image

Encipher an image.

Examples:

enciphered_img = img.encipher("magic word")

Parameters:

  • passphrase (String) —

    the passphrase with which to encipher

Returns:



6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
 
# File 'ext/RMagick/rmimage.cpp', line 6301

VALUE
Image_encipher(VALUE self, VALUE passphrase)
{
    Image *image, *new_image;
    char *pf;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    pf = StringValueCStr(passphrase);      // ensure passphrase is a string
    exception = AcquireExceptionInfo();

    new_image = rm_clone_image(image);

    GVL_STRUCT_TYPE(EncipherImage) args = { new_image, pf, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EncipherImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    if (!okay)
    {
        DestroyImage(new_image);
        rb_raise(rb_eRuntimeError, "EncipherImage failed for unknown reason.");
    }

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#endian ⇒ Magick::EndianType

Return endian option for images that support it.

Returns:

  • (Magick::EndianType) —

    the endian option



6337
6338
6339
6340
6341
6342
 
# File 'ext/RMagick/rmimage.cpp', line 6337

VALUE
Image_endian(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return EndianType_find(image->endian);
}

#endian=(type) ⇒ Magick::EndianType

Set endian option for images that support it.

Parameters:

  • type (Magick::EndianType) —

    the endian type

Returns:

  • (Magick::EndianType) —

    the given type



6351
6352
6353
6354
6355
6356
6357
 
# File 'ext/RMagick/rmimage.cpp', line 6351

VALUE
Image_endian_eq(VALUE self, VALUE type)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(type, image->endian, EndianType);
    return type;
}

#enhance ⇒ Magick::Image

Apply a digital filter that improves the quality of a noisy image.

Returns:



6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
 
# File 'ext/RMagick/rmimage.cpp', line 6364

VALUE
Image_enhance(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(EnhanceImage) args = { image, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EnhanceImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#equalize ⇒ Magick::Image

Apply a histogram equalization to the image.

Returns:



6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
 
# File 'ext/RMagick/rmimage.cpp', line 6387

VALUE
Image_equalize(VALUE self)
{
    Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(EqualizeImage) args = { new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EqualizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(EqualizeImage) args = { new_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EqualizeImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#equalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image #equalize_channel(*channels) ⇒ Magick::Image

Applies a histogram equalization to the image. Only the specified channels are equalized.

Overloads:

  • #equalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #equalize_channel(*channels) ⇒ Magick::Image

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
 
# File 'ext/RMagick/rmimage.cpp', line 6425

VALUE
Image_equalize_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif
    ChannelType channels;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(EqualizeImage) args = { new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EqualizeImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(EqualizeImageChannel) args = { new_image, channels };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EqualizeImageChannel), &args);

    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#erase! ⇒ Magick::Image

Reset the image to the background color.

Returns:



6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
 
# File 'ext/RMagick/rmimage.cpp', line 6467

VALUE
Image_erase_bang(VALUE self)
{
    Image *image;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageBackgroundColor) args = { image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageBackgroundColor) args = { image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageBackgroundColor), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#excerpt(x, y, width, height) ⇒ Magick::Image

This method is very similar to crop. It extracts the rectangle specified by its arguments from the image and returns it as a new image. However, excerpt does not respect the virtual page offset and does not update the page offset and is more efficient than cropping.

Parameters:

  • x (Numeric) —

    the x position for the start of the rectangle

  • y (Numeric) —

    the y position for the start of the rectangle

  • width (Numeric) —

    the width of the rectancle

  • height (Numeric) —

    the height of the rectangle

Returns:

See Also:



6562
6563
6564
6565
6566
6567
 
# File 'ext/RMagick/rmimage.cpp', line 6562

VALUE
Image_excerpt(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
    rm_check_destroyed(self);
    return excerpt(False, self, x, y, width, height);
}

#excerpt!(x, y, width, height) ⇒ Magick::Image

In-place form of #excerpt.

This method is very similar to crop. It extracts the rectangle specified by its arguments from the image and returns it as a new image. However, excerpt does not respect the virtual page offset and does not update the page offset and is more efficient than cropping.

Parameters:

  • x (Numeric) —

    the x position for the start of the rectangle

  • y (Numeric) —

    the y position for the start of the rectangle

  • width (Numeric) —

    the width of the rectancle

  • height (Numeric) —

    the height of the rectangle

Returns:

See Also:



6587
6588
6589
6590
6591
6592
 
# File 'ext/RMagick/rmimage.cpp', line 6587

VALUE
Image_excerpt_bang(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
    rm_check_frozen(self);
    return excerpt(True, self, x, y, width, height);
}

#export_pixels(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB") ⇒ Array<Numeric>

Extracts the pixel data from the specified rectangle and returns it as an array of Integer values. The array returned by #export_pixels is suitable for use as an argument to #import_pixels.

Returns array of pixels.

Parameters:

  • x (Numeric) (defaults to: 0) —

    The offset of the rectangle from the upper-left corner of the image.

  • y (Numeric) (defaults to: 0) —

    The offset of the rectangle from the upper-left corner of the image.

  • cols (Numeric) (defaults to: self.columns) —

    The width of the rectangle.

  • rows (Numeric) (defaults to: self.rows) —

    The height of the rectangle.

  • map (String) (defaults to: "RGB") —

    A string that describes which pixel channel data is desired and the order in which it should be stored. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, I = intensity (for grayscale), or P = pad.

Returns:

  • (Array<Numeric>) —

    array of pixels



6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
 
# File 'ext/RMagick/rmimage.cpp', line 6612

VALUE
Image_export_pixels(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    long x_off = 0L, y_off = 0L;
    unsigned long cols, rows;
    long n, npixels;
    MagickBooleanType okay;
    const char *map = "RGB";
    Quantum *pixels;
    VALUE ary;
    ExceptionInfo *exception;


    image = rm_check_destroyed(self);
    cols = image->columns;
    rows = image->rows;

    switch (argc)
    {
        case 5:
            map   = StringValueCStr(argv[4]);
        case 4:
            rows  = NUM2ULONG(argv[3]);
        case 3:
            cols  = NUM2ULONG(argv[2]);
        case 2:
            y_off = NUM2LONG(argv[1]);
        case 1:
            x_off = NUM2LONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
            break;
    }

    if (   x_off < 0 || (unsigned long)x_off > image->columns
           || y_off < 0 || (unsigned long)y_off > image->rows
           || cols == 0 || rows == 0)
    {
        rb_raise(rb_eArgError, "invalid extract geometry");
    }


    npixels = (long)(cols * rows * strlen(map));
    pixels = ALLOC_N(Quantum, npixels);
    if (!pixels)    // app recovered from exception
    {
        return rb_ary_new2(0L);
    }

    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(ExportImagePixels) args = { image, x_off, y_off, cols, rows, map, QuantumPixel, (void *)pixels, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ExportImagePixels), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    if (!okay)
    {
        xfree((void *)pixels);
        CHECK_EXCEPTION();

        // Should never get here...
        rm_magick_error("ExportImagePixels failed with no explanation.");
    }

    DestroyExceptionInfo(exception);

    ary = rb_ary_new2(npixels);
    for (n = 0; n < npixels; n++)
    {
        rb_ary_push(ary, QUANTUM2NUM(pixels[n]));
    }

    xfree((void *)pixels);

    RB_GC_GUARD(ary);

    return ary;
}

#export_pixels_to_str(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB", type = Magick::CharPixel) ⇒ String

Extracts the pixel data from the specified rectangle and returns it as a string.

Returns the pixel data.

Parameters:

  • x (Numeric) (defaults to: 0) —

    The offset of the rectangle from the upper-left corner of the image.

  • y (Numeric) (defaults to: 0) —

    The offset of the rectangle from the upper-left corner of the image.

  • cols (Numeric) (defaults to: self.columns) —

    The width of the rectangle.

  • rows (Numeric) (defaults to: self.rows) —

    The height of the rectangle.

  • map (String) (defaults to: "RGB") —

    A string that describes which pixel channel data is desired and the order in which it should be stored. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, I = intensity (for grayscale), or P = pad.

  • type (Magick::StorageType) (defaults to: Magick::CharPixel) —

    A StorageType value that specifies the C datatype to which the pixel data will be converted.

Returns:

  • (String) —

    the pixel data



6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
 
# File 'ext/RMagick/rmimage.cpp', line 6778

VALUE
Image_export_pixels_to_str(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    long x_off = 0L, y_off = 0L;
    unsigned long cols, rows;
    unsigned long npixels;
    size_t sz;
    MagickBooleanType okay;
    const char *map = "RGB";
    StorageType type = CharPixel;
    VALUE string;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    cols = image->columns;
    rows = image->rows;

    switch (argc)
    {
        case 6:
            VALUE_TO_ENUM(argv[5], type, StorageType);
        case 5:
            map   = StringValueCStr(argv[4]);
        case 4:
            rows  = NUM2ULONG(argv[3]);
        case 3:
            cols  = NUM2ULONG(argv[2]);
        case 2:
            y_off = NUM2LONG(argv[1]);
        case 1:
            x_off = NUM2LONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 6)", argc);
            break;
    }

    if (   x_off < 0 || (unsigned long)x_off > image->columns
           || y_off < 0 || (unsigned long)y_off > image->rows
           || cols == 0 || rows == 0)
    {
        rb_raise(rb_eArgError, "invalid extract geometry");
    }


    npixels = cols * rows * strlen(map);
    switch (type)
    {
        case CharPixel:
            sz = sizeof(unsigned char);
            break;
        case ShortPixel:
            sz = sizeof(unsigned short);
            break;
        case DoublePixel:
            sz = sizeof(double);
            break;
        case FloatPixel:
            sz = sizeof(float);
            break;
        case LongPixel:
            sz = sizeof(unsigned long);
            break;
        case QuantumPixel:
            sz = sizeof(Quantum);
            break;
        case UndefinedPixel:
        default:
            rb_raise(rb_eArgError, "undefined storage type");
            break;
    }

    // Allocate a string long enough to hold the exported pixel data.
    // Get a pointer to the buffer.
    string = rb_str_new2("");
    rb_str_resize(string, (long)(sz * npixels));

    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(ExportImagePixels) args = { image, x_off, y_off, cols, rows, map, type, (void *)RSTRING_PTR(string), exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ExportImagePixels), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    if (!okay)
    {
        // Let GC have the string buffer.
        rb_str_resize(string, 0);
        CHECK_EXCEPTION();

        // Should never get here...
        rm_magick_error("ExportImagePixels failed with no explanation.");
    }

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(string);

    return string;
}

#extent(width, height, x = 0, y = 0) ⇒ Magick::Image

If width or height is greater than the target image’s width or height, extends the width and height of the target image to the specified values. The new pixels are set to the background color. If width or height is less than the target image’s width or height, crops the target image.

Returns a new image.

Parameters:

  • width (Numeric) —

    The width of the new image

  • height (Numeric) —

    The height of the new image

  • x (Numeric) (defaults to: 0) —

    The upper-left corner of the new image is positioned

  • y (Numeric) (defaults to: 0) —

    The upper-left corner of the new image is positioned

Returns:



6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
 
# File 'ext/RMagick/rmimage.cpp', line 6707

VALUE
Image_extent(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    RectangleInfo geometry;
    long height, width;
    ExceptionInfo *exception;

    rm_check_destroyed(self);

    if (argc < 2 || argc > 4)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (expected 2 to 4, got %d)", argc);
    }

    geometry.y = geometry.x = 0L;
    switch (argc)
    {
        case 4:
            geometry.y = NUM2LONG(argv[3]);
        case 3:
            geometry.x = NUM2LONG(argv[2]);
        default:
            geometry.height = height = NUM2LONG(argv[1]);
            geometry.width = width = NUM2LONG(argv[0]);
            break;
    }

    // Use the signed versions of these two values to test for < 0
    if (height <= 0L || width <= 0L)
    {
        if (geometry.x == 0 && geometry.y == 0)
        {
            rb_raise(rb_eArgError, "invalid extent geometry %ldx%ld", width, height);
        }
        else
        {
            rb_raise(rb_eArgError, "invalid extent geometry %ldx%ld+%" RMIdSIZE "+%" RMIdSIZE "",
                     width, height, geometry.x, geometry.y);
        }
    }


    TypedData_Get_Struct(self, Image, &rm_image_data_type, image);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(ExtentImage) args = { image, &geometry, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ExtentImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#extract_info ⇒ Magick::Rectangle

The extract_info attribute reader.

Returns:

  • (Magick::Rectangle) —

    the Rectangle object



6885
6886
6887
6888
6889
6890
 
# File 'ext/RMagick/rmimage.cpp', line 6885

VALUE
Image_extract_info(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return Import_RectangleInfo(&image->extract_info);
}

#extract_info=(rect) ⇒ Magick::Rectangle

Set the extract_info attribute.

Parameters:

  • rect (Magick::Rectangle) —

    the Rectangle object

Returns:

  • (Magick::Rectangle) —

    the given value



6899
6900
6901
6902
6903
6904
6905
 
# File 'ext/RMagick/rmimage.cpp', line 6899

VALUE
Image_extract_info_eq(VALUE self, VALUE rect)
{
    Image *image = rm_check_frozen(self);
    Export_RectangleInfo(&image->extract_info, rect);
    return rect;
}

#filename ⇒ String

Get image filename.

Returns:

  • (String) —

    the filename



6913
6914
6915
6916
6917
 
# File 'ext/RMagick/rmimage.cpp', line 6913

VALUE
Image_filename(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, filename, str, &rm_image_data_type);
}

#filesize ⇒ Numeric

Return the image file size.

Returns:

  • (Numeric) —

    the file size



6925
6926
6927
6928
6929
 
# File 'ext/RMagick/rmimage.cpp', line 6925

VALUE Image_filesize(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return INT2FIX(GetBlobSize(image));
}

#filter ⇒ Magick::FilterType

Get filter type.

Returns:

  • (Magick::FilterType) —

    the filter



6937
6938
6939
6940
6941
6942
 
# File 'ext/RMagick/rmimage.cpp', line 6937

VALUE
Image_filter(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return FilterType_find(image->filter);
}

#filter=(filter) ⇒ Magick::FilterType

Set filter type.

Parameters:

  • filter (Magick::FilterType) —

    the filter

Returns:

  • (Magick::FilterType) —

    the given filter



6951
6952
6953
6954
6955
6956
6957
 
# File 'ext/RMagick/rmimage.cpp', line 6951

VALUE
Image_filter_eq(VALUE self, VALUE filter)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(filter, image->filter, FilterType);
    return filter;
}

#find_similar_region(target, x = 0, y = 0) ⇒ Array<Numeric>?

This interesting method searches for a rectangle in the image that is similar to the target. For the rectangle to be similar each pixel in the rectangle must match the corresponding pixel in the target image within the range specified by the fuzz attributes of the image and the target image.

Returns If the search succeeds, the return value is an array with 2 elements. These elements are the x- and y-offsets of the matching rectangle. If the search fails the return value is nil.

Parameters:

  • target (Magick::Image, Magick::ImageList) —

    An image that forms the target of the search. This image can be any size. Either an imagelist or an image. If an imagelist, uses the current image.

  • x (Numeric) (defaults to: 0) —

    The starting x-offsets for the search.

  • y (Numeric) (defaults to: 0) —

    The starting y-offsets for the search.

Returns:

  • (Array<Numeric>, nil) —

    If the search succeeds, the return value is an array with 2 elements. These elements are the x- and y-offsets of the matching rectangle. If the search fails the return value is nil.



6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
 
# File 'ext/RMagick/rmimage.cpp', line 6976

VALUE
Image_find_similar_region(int argc, VALUE *argv, VALUE self)
{
    Image *image, *target;
    VALUE region, targ;
    ssize_t x = 0L, y = 0L;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 3:
            y = NUM2LONG(argv[2]);
        case 2:
            x = NUM2LONG(argv[1]);
        case 1:
            targ = rm_cur_image(argv[0]);
            target = rm_check_destroyed(targ);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 3)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(IsEquivalentImage) args = { image, target, &x, &y, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(IsEquivalentImage), &args);
#else
    GVL_STRUCT_TYPE(IsImageSimilar) args = { image, target, &x, &y, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(IsImageSimilar), &args);
#endif
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    if (!okay)
    {
        return Qnil;
    }

    region = rb_ary_new2(2);
    rb_ary_store(region, 0L, LONG2NUM(x));
    rb_ary_store(region, 1L, LONG2NUM(y));

    RB_GC_GUARD(region);
    RB_GC_GUARD(targ);

    return region;
}

#flip ⇒ Magick::Image

Create a vertical mirror image by reflecting the pixels around the central x-axis.

Returns:

See Also:



7081
7082
7083
7084
7085
7086
 
# File 'ext/RMagick/rmimage.cpp', line 7081

VALUE
Image_flip(VALUE self)
{
    rm_check_destroyed(self);
    return flipflop(False, self, GVL_FUNC(FlipImage));
}

#flip! ⇒ Magick::Image

Create a vertical mirror image by reflecting the pixels around the central x-axis. In-place form of #flip.

Returns:

See Also:



7098
7099
7100
7101
7102
7103
 
# File 'ext/RMagick/rmimage.cpp', line 7098

VALUE
Image_flip_bang(VALUE self)
{
    rm_check_frozen(self);
    return flipflop(True, self, GVL_FUNC(FlipImage));
}

#flop ⇒ Magick::Image

Create a horizonal mirror image by reflecting the pixels around the central y-axis.

Returns:

See Also:



7114
7115
7116
7117
7118
7119
 
# File 'ext/RMagick/rmimage.cpp', line 7114

VALUE
Image_flop(VALUE self)
{
    rm_check_destroyed(self);
    return flipflop(False, self, GVL_FUNC(FlopImage));
}

#flop! ⇒ Magick::Image

Create a horizonal mirror image by reflecting the pixels around the central y-axis. In-place form of #flop.

Returns:

See Also:



7131
7132
7133
7134
7135
7136
 
# File 'ext/RMagick/rmimage.cpp', line 7131

VALUE
Image_flop_bang(VALUE self)
{
    rm_check_frozen(self);
    return flipflop(True, self, GVL_FUNC(FlopImage));
}

#format ⇒ String?

Return the image encoding format. For example, “GIF” or “PNG”.

Returns:

  • (String, nil) —

    the encoding format



7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
 
# File 'ext/RMagick/rmimage.cpp', line 7144

VALUE
Image_format(VALUE self)
{
    Image *image;
    const MagickInfo *magick_info;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    if (*image->magick)
    {
        // Deliberately ignore the exception info!
        exception = AcquireExceptionInfo();
        magick_info = GetMagickInfo(image->magick, exception);
        DestroyExceptionInfo(exception);
        return magick_info ? rb_str_new2(magick_info->name) : Qnil;
    }

    return Qnil;
}

#format=(magick) ⇒ String

Set the image encoding format. For example, “GIF” or “PNG”.

Parameters:

  • magick (String) —

    the encoding format

Returns:

  • (String) —

    the given value



7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
 
# File 'ext/RMagick/rmimage.cpp', line 7172

VALUE
Image_format_eq(VALUE self, VALUE magick)
{
    Image *image;
    const MagickInfo *m;
    char *mgk;
    ExceptionInfo *exception;

    image = rm_check_frozen(self);

    mgk = StringValueCStr(magick);

    exception = AcquireExceptionInfo();
    m = GetMagickInfo(mgk, exception);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    if (!m)
    {
        rb_raise(rb_eArgError, "unknown format: %s", mgk);
    }


    strlcpy(image->magick, m->name, sizeof(image->magick));
    return magick;
}

#frame(width = self.columns+25*2, height = self.rows+25*2, x = 25, y = 25, inner_bevel = 6, outer_bevel = 6, color = self.matte_color) ⇒ Magick::Image

Add a simulated three-dimensional border around the image.

Returns a new image.

Parameters:

  • width (Numeric) (defaults to: self.columns+25*2) —

    The width of the left and right sides.

  • height (Numeric) (defaults to: self.rows+25*2) —

    The height of the top and bottom sides.

  • x (Numeric) (defaults to: 25) —

    The offset of the image from the upper-left outside corner of the border.

  • y (Numeric) (defaults to: 25) —

    The offset of the image from the upper-left outside corner of the border.

  • inner_bevel (Numeric) (defaults to: 6) —

    The width of the inner shadows of the border.

  • outer_bevel (Numeric) (defaults to: 6) —

    The width of the outer shadows of the border.

  • color (Magick::Pixel, String) (defaults to: self.matte_color) —

    The border color.

Returns:



7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
 
# File 'ext/RMagick/rmimage.cpp', line 7214

VALUE
Image_frame(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    FrameInfo frame_info;

    image = rm_check_destroyed(self);

    frame_info.width = image->columns + 50;
    frame_info.height = image->rows + 50;
    frame_info.x = 25;
    frame_info.y = 25;
    frame_info.inner_bevel = 6;
    frame_info.outer_bevel = 6;

    switch (argc)
    {
        case 7:
            Color_to_PixelColor(&image->matte_color, argv[6]);
        case 6:
            frame_info.outer_bevel = NUM2LONG(argv[5]);
        case 5:
            frame_info.inner_bevel = NUM2LONG(argv[4]);
        case 4:
            frame_info.y = NUM2LONG(argv[3]);
        case 3:
            frame_info.x = NUM2LONG(argv[2]);
        case 2:
            frame_info.height = image->rows + 2*NUM2LONG(argv[1]);
        case 1:
            frame_info.width = image->columns + 2*NUM2LONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 7)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(FrameImage) args = { image, &frame_info, image->compose, exception };
#else
    GVL_STRUCT_TYPE(FrameImage) args = { image, &frame_info, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FrameImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#function_channel(function, *args, channel = Magick::AllChannels) ⇒ Magick::Image #function_channel(function, *args, *channels) ⇒ Magick::Image

Set the function on a channel.

Overloads:

  • #function_channel(function, *args, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • function (Magick::MagickFunction) —

      the function

    • *args (Float) —

      One or more floating-point numbers. The number of parameters depends on the function. See the ImageMagick documentation for details.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #function_channel(function, *args, *channels) ⇒ Magick::Image

    Parameters:

    • function (Magick::MagickFunction) —

      the function

    • *args (Float) —

      One or more floating-point numbers. The number of parameters depends on the function. See the ImageMagick documentation for details.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
 
# File 'ext/RMagick/rmimage.cpp', line 7334

VALUE
Image_function_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickFunction function;
    unsigned long n, nparms;
    double *parms;
    ChannelType channels;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // The number of parameters depends on the function.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "no function specified");
    }

    VALUE_TO_ENUM(argv[0], function, MagickFunction);
    argc -= 1;
    argv += 1;

    switch (function)
    {
        case PolynomialFunction:
            if (argc == 0)
            {
                rb_raise(rb_eArgError, "PolynomialFunction requires at least one argument.");
            }
            break;
        case SinusoidFunction:
        case ArcsinFunction:
        case ArctanFunction:
           if (argc < 1 || argc > 4)
           {
               rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
           }
           break;
        default:
            rb_raise(rb_eArgError, "undefined function");
            break;
    }

    nparms = argc;
    parms = ALLOC_N(double, nparms);

    for (n = 0; n < nparms; n++)
    {
        VALUE element = argv[n];
        if (rm_check_num2dbl(element))
        {
            parms[n] = NUM2DBL(element);
        }
        else
        {
            xfree(parms);
            rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
        }
    }

    exception = AcquireExceptionInfo();
    new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(FunctionImage) args = { new_image, function, nparms, parms, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FunctionImage), &args);
    END_CHANNEL_MASK(new_image);
#else
    GVL_STRUCT_TYPE(FunctionImageChannel) args = { new_image, channels, function, nparms, parms, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FunctionImageChannel), &args);
#endif
    xfree(parms);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#fuzz ⇒ Float

Get the number of algorithms search for a target color. By default the color must be exact. Use this attribute to match colors that are close to the target color in RGB space.

Returns:

  • (Float) —

    the fuzz

See Also:



7422
7423
7424
7425
7426
 
# File 'ext/RMagick/rmimage.cpp', line 7422

VALUE
Image_fuzz(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, fuzz, dbl, &rm_image_data_type);
}

#fuzz=(fuzz) ⇒ String, Float

Set the number of algorithms search for a target color.

Parameters:

  • fuzz (String, Float) —

    The argument may be a floating-point numeric value or a string in the form “NN%”.

Returns:

  • (String, Float) —

    the given value

See Also:



7437
7438
7439
7440
7441
7442
7443
 
# File 'ext/RMagick/rmimage.cpp', line 7437

VALUE
Image_fuzz_eq(VALUE self, VALUE fuzz)
{
    Image *image = rm_check_frozen(self);
    image->fuzz = rm_fuzz_to_dbl(fuzz);
    return fuzz;
}

#fx(expression, channel = Magick::AllChannels) ⇒ Magick::Image #fx(expression, *channels) ⇒ Magick::Image

Apply fx on the image.

Overloads:

  • #fx(expression, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • expression (String) —

      A mathematical expression

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #fx(expression, *channels) ⇒ Magick::Image

    Parameters:

    • expression (String) —

      A mathematical expression

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
 
# File 'ext/RMagick/rmimage.cpp', line 7459

VALUE
Image_fx(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    char *expression;
    ChannelType channels;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be exactly 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    expression = StringValueCStr(argv[0]);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(FxImage) args = { image, expression, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FxImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(FxImageChannel) args = { image, channels, expression, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FxImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#gamma ⇒ Float

Get the gamma level of the image.

Returns:

  • (Float) —

    the gamma level



7504
7505
7506
7507
7508
 
# File 'ext/RMagick/rmimage.cpp', line 7504

VALUE
Image_gamma(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, gamma, dbl, &rm_image_data_type);
}

#gamma=(val) ⇒ Float

Set the gamma level of the image.

Parameters:

  • val (Float) —

    the gamma level

Returns:

  • (Float) —

    the gamma level



7516
7517
7518
7519
7520
 
# File 'ext/RMagick/rmimage.cpp', line 7516

VALUE
Image_gamma_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, gamma, dbl, &rm_image_data_type);
}

#gamma_channel(gamma, channel = Magick::AllChannels) ⇒ Magick::Image #gamma_channel(gamma, *channels) ⇒ Magick::Image

Apply gamma to a channel.

Overloads:

  • #gamma_channel(gamma, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • Values —

      gamma [Float] typically range from 0.8 to 2.3. You can also reduce the influence of a particular channel with a gamma value of 0.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #gamma_channel(gamma, *channels) ⇒ Magick::Image

    Parameters:

    • Values —

      gamma [Float] typically range from 0.8 to 2.3. You can also reduce the influence of a particular channel with a gamma value of 0.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
 
# File 'ext/RMagick/rmimage.cpp', line 7538

VALUE
Image_gamma_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double gamma;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be exactly one remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "missing gamma argument");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    gamma = NUM2DBL(argv[0]);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(GammaImage) args = { new_image, gamma, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(GammaImageChannel) args = { new_image, channels, gamma };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#gamma_correct(red_gamma, green_gamma = red_gamma, blue_gamma = green_gamma) ⇒ Magick::Image

gamma-correct an image.

Returns a new image.

Returns:



7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
 
# File 'ext/RMagick/rmimage.cpp', line 7588

VALUE
Image_gamma_correct(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double red_gamma, green_gamma, blue_gamma;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            red_gamma   = NUM2DBL(argv[0]);
            green_gamma = blue_gamma = red_gamma;
            break;
        case 2:
            red_gamma   = NUM2DBL(argv[0]);
            green_gamma = NUM2DBL(argv[1]);
            blue_gamma  = green_gamma;
            break;
        case 3:
        case 4:
            red_gamma     = NUM2DBL(argv[0]);
            green_gamma   = NUM2DBL(argv[1]);
            blue_gamma    = NUM2DBL(argv[2]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 3)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
#endif

    if ((red_gamma == green_gamma) && (green_gamma == blue_gamma))
    {
#if defined(IMAGEMAGICK_7)
        BEGIN_CHANNEL_MASK(new_image, (ChannelType) (RedChannel | GreenChannel | BlueChannel));
        GVL_STRUCT_TYPE(GammaImage) args = { new_image, red_gamma, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImage), &args);
        END_CHANNEL_MASK(new_image);
#else
        GVL_STRUCT_TYPE(GammaImageChannel) args = { new_image, (ChannelType) (RedChannel | GreenChannel | BlueChannel), red_gamma };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImageChannel), &args);
#endif
    }
    else
    {
#if defined(IMAGEMAGICK_7)
        BEGIN_CHANNEL_MASK(new_image, RedChannel);
        GVL_STRUCT_TYPE(GammaImage) args1 = { new_image, red_gamma, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImage), &args1);
        END_CHANNEL_MASK(new_image);

        BEGIN_CHANNEL_MASK(new_image, GreenChannel);
        GVL_STRUCT_TYPE(GammaImage) args2 = { new_image, green_gamma, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImage), &args2);
        END_CHANNEL_MASK(new_image);

        BEGIN_CHANNEL_MASK(new_image, BlueChannel);
        GVL_STRUCT_TYPE(GammaImage) args3 = { new_image, blue_gamma, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImage), &args3);
        END_CHANNEL_MASK(new_image);
#else
        GVL_STRUCT_TYPE(GammaImageChannel) args1 = { new_image, RedChannel, red_gamma };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImageChannel), &args1);

        GVL_STRUCT_TYPE(GammaImageChannel) args2 = { new_image, GreenChannel, green_gamma };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImageChannel), &args2);

        GVL_STRUCT_TYPE(GammaImageChannel) args3 = { new_image, BlueChannel, blue_gamma };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GammaImageChannel), &args3);
#endif
    }

#if defined(IMAGEMAGICK_7)
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#gaussian_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Blur the image.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian operator.

  • sigma (Float) (defaults to: 1.0) —

    The sigma (standard deviation) of the Gaussian operator.

Returns:



7686
7687
7688
7689
7690
 
# File 'ext/RMagick/rmimage.cpp', line 7686

VALUE
Image_gaussian_blur(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GVL_FUNC(GaussianBlurImage));
}

#gaussian_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #gaussian_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

Blur the image on a channel.

Overloads:

  • #gaussian_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The sigma (standard deviation) of the Gaussian operator.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #gaussian_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The sigma (standard deviation) of the Gaussian operator.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
 
# File 'ext/RMagick/rmimage.cpp', line 7708

VALUE
Image_gaussian_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    ExceptionInfo *exception;
    double radius = 0.0, sigma = 1.0;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There can be 0, 1, or 2 remaining arguments.
    switch (argc)
    {
        case 2:
            sigma = NUM2DBL(argv[1]);
            /* Fall thru */
        case 1:
            radius = NUM2DBL(argv[0]);
            /* Fall thru */
        case 0:
            break;
        default:
            raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(GaussianBlurImage) args = { image, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GaussianBlurImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
    rm_check_exception(exception, new_image, DestroyOnError);
#else
    GVL_STRUCT_TYPE(GaussianBlurImageChannel) args = { image, channels, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GaussianBlurImageChannel), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
#endif

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#geometry ⇒ String

Get the preferred size of the image when encoding.

Returns:

  • (String) —

    the geometry

See Also:



7760
7761
7762
7763
7764
 
# File 'ext/RMagick/rmimage.cpp', line 7760

VALUE
Image_geometry(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, geometry, str, &rm_image_data_type);
}

#geometry=(geometry) ⇒ String

Set the preferred size of the image when encoding.

Parameters:

  • geometry (String) —

    the geometry

Returns:

  • (String) —

    the given geometry

See Also:



7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
 
# File 'ext/RMagick/rmimage.cpp', line 7774

VALUE
Image_geometry_eq(VALUE self, VALUE geometry)
{
    Image *image;
    VALUE geom_str;
    char *geom;

    image = rm_check_frozen(self);

    if (geometry == Qnil)
    {
        magick_free(image->geometry);
        image->geometry = NULL;
        return self;
    }


    geom_str = rb_String(geometry);
    geom = StringValueCStr(geom_str);
    if (!IsGeometry(geom))
    {
        rb_raise(rb_eTypeError, "invalid geometry: %s", geom);
    }
    magick_clone_string(&image->geometry, geom);

    RB_GC_GUARD(geom_str);

    return geometry;
}

#get_exif_by_entry(*entry) ⇒ Object

Retrieve EXIF data by entry or all. If one or more entry names specified, return the values associated with the entries. If no entries specified, return all entries and values. The return value is an array of [name,value] arrays.



843
844
845
846
847
848
849
850
851
852
853
854
855
856
 
# File 'lib/rmagick_internal.rb', line 843

def get_exif_by_entry(*entry)
  ary = []
  if entry.length.zero?
    exif_data = self['EXIF:*']
    exif_data.split("\n").each { |exif| ary.push(exif.split('=')) } if exif_data
  else
    get_exif_by_entry # ensure properties is populated with exif data
    entry.each do |name|
      rval = self["EXIF:#{name}"]
      ary.push([name, rval])
    end
  end
  ary
end

#get_exif_by_number(*tag) ⇒ Object

Retrieve EXIF data by tag number or all tag/value pairs. The return value is a hash.



859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
 
# File 'lib/rmagick_internal.rb', line 859

def get_exif_by_number(*tag)
  hash = {}
  if tag.length.zero?
    exif_data = self['EXIF:!']
    if exif_data
      exif_data.split("\n").each do |exif|
        tag, value = exif.split('=')
        tag = tag[1, 4].hex
        hash[tag] = value
      end
    end
  else
    get_exif_by_number # ensure properties is populated with exif data
    tag.each do |num|
      rval = self[sprintf('#%04X', num.to_i)]
      hash[num] = rval == 'unknown' ? nil : rval
    end
  end
  hash
end

#get_iptc_dataset(ds) ⇒ Object

Retrieve IPTC information by record number:dataset tag constant defined in Magick::IPTC, above.



882
883
884
 
# File 'lib/rmagick_internal.rb', line 882

def get_iptc_dataset(ds)
  self['IPTC:' + ds]
end

#get_pixels(x_arg, y_arg, cols_arg, rows_arg) ⇒ Array<Magick::Pixel>

Gets the pixels from the specified rectangle within the image.

Parameters:

  • x_arg (Numeric) —

    x position of start of region

  • y_arg (Numeric) —

    y position of start of region

  • cols_arg (Numeric) —

    width of region

  • rows_arg (Numeric) —

    height of region

Returns:

  • (Array<Magick::Pixel>) —

    An array of Magick::Pixel objects corresponding to the pixels in the rectangle defined by the geometry parameters.

See Also:



7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
 
# File 'ext/RMagick/rmimage.cpp', line 7816

VALUE
Image_get_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg, VALUE rows_arg)
{
    Image *image;
    ExceptionInfo *exception;
    long x, y;
    unsigned long columns, rows;
    long size, n;
    VALUE pixel_ary;
#if defined(IMAGEMAGICK_7)
    const Quantum *pixels;
#else
    const PixelPacket *pixels;
    const IndexPacket *indexes;
#endif

    image = rm_check_destroyed(self);
    x       = NUM2LONG(x_arg);
    y       = NUM2LONG(y_arg);
    columns = NUM2ULONG(cols_arg);
    rows    = NUM2ULONG(rows_arg);

    if ((x+columns) > image->columns || (y+rows) > image->rows)
    {
        rb_raise(rb_eRangeError, "geometry (%lux%lu%+ld%+ld) exceeds image bounds",
                 columns, rows, x, y);
    }

    // Cast AcquireImagePixels to get rid of the const qualifier. We're not going
    // to change the pixels but I don't want to make "pixels" const.
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(GetVirtualPixels) args = { image, x, y, columns, rows, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetVirtualPixels), &args);
    pixels = reinterpret_cast<decltype(pixels)>(ret);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    // If the function failed, return a 0-length array.
    if (!pixels)
    {
        return rb_ary_new();
    }

    // Allocate an array big enough to contain the PixelPackets.
    size = (long)(columns * rows);
    pixel_ary = rb_ary_new2(size);

#if defined(IMAGEMAGICK_6)
    indexes = GetVirtualIndexQueue(image);
#endif

    // Convert the PixelPackets to Magick::Pixel objects
    for (n = 0; n < size; n++)
    {
#if defined(IMAGEMAGICK_7)
        PixelPacket color;
        memset(&color, 0, sizeof(color));
        color.red   = GetPixelRed(image, pixels);
        color.green = GetPixelGreen(image, pixels);
        color.blue  = GetPixelBlue(image, pixels);
        color.alpha = GetPixelAlpha(image, pixels);
        color.black = GetPixelBlack(image, pixels);
        rb_ary_store(pixel_ary, n, Pixel_from_PixelPacket(&color));

        pixels += GetPixelChannels(image);
#else
        MagickPixel mpp;
        mpp.red = GetPixelRed(pixels);
        mpp.green = GetPixelGreen(pixels);
        mpp.blue = GetPixelBlue(pixels);
        mpp.opacity = GetPixelOpacity(pixels);
        if (indexes)
        {
            mpp.index = GetPixelIndex(indexes + n);
        }
        rb_ary_store(pixel_ary, n, Pixel_from_MagickPixel(&mpp));
        pixels++;
#endif
    }

    return pixel_ary;
}

#gravity ⇒ Magick::GravityType

Get the direction that the image gravitates within the composite.

Returns:

  • (Magick::GravityType) —

    the image gravity



15020
15021
15022
15023
15024
 
# File 'ext/RMagick/rmimage.cpp', line 15020

VALUE Image_gravity(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return GravityType_find(image->gravity);
}

#gravity=(gravity) ⇒ Magick::GravityType

Set the direction that the image gravitates within the composite.

Parameters:

  • gravity (Magick::GravityType) —

    the image gravity

Returns:

  • (Magick::GravityType) —

    the given value



15033
15034
15035
15036
15037
15038
 
# File 'ext/RMagick/rmimage.cpp', line 15033

VALUE Image_gravity_eq(VALUE self, VALUE gravity)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(gravity, image->gravity, GravityType);
    return gravity;
}

#gray? ⇒ Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities.

Returns:

  • (Boolean) —

    true if image is gray, false otherwise



7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
 
# File 'ext/RMagick/rmimage.cpp', line 7957

VALUE
Image_gray_q(VALUE self)
{
#if defined(HAVE_SETIMAGEGRAY)
    return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))SetImageGray);
#else
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
    return has_attribute(self, IsGrayImage);
#else
    // For ImageMagick 6.7
    Image *image;
    ColorspaceType colorspace;
    VALUE ret;

    image = rm_check_destroyed(self);
    colorspace = image->colorspace;
    if (image->colorspace == sRGBColorspace || image->colorspace == TransparentColorspace) {
        // Workaround
        //   If image colorspace has non-RGBColorspace, IsGrayImage() always return false.
        image->colorspace = RGBColorspace;
    }

    ret = has_attribute(self, IsGrayImage);
    image->colorspace = colorspace;
    return ret;
#endif
#endif
}

#grey? ⇒ Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities.

Returns:

  • (Boolean) —

    true if image is gray, false otherwise



7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
 
# File 'ext/RMagick/rmimage.cpp', line 7957

VALUE
Image_gray_q(VALUE self)
{
#if defined(HAVE_SETIMAGEGRAY)
    return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))SetImageGray);
#else
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
    return has_attribute(self, IsGrayImage);
#else
    // For ImageMagick 6.7
    Image *image;
    ColorspaceType colorspace;
    VALUE ret;

    image = rm_check_destroyed(self);
    colorspace = image->colorspace;
    if (image->colorspace == sRGBColorspace || image->colorspace == TransparentColorspace) {
        // Workaround
        //   If image colorspace has non-RGBColorspace, IsGrayImage() always return false.
        image->colorspace = RGBColorspace;
    }

    ret = has_attribute(self, IsGrayImage);
    image->colorspace = colorspace;
    return ret;
#endif
#endif
}

#histogram? ⇒ Boolean

Return true if has 1024 unique colors or less.

Returns:

  • (Boolean) —

    true if image has <= 1024 unique colors



7992
7993
7994
7995
7996
 
# File 'ext/RMagick/rmimage.cpp', line 7992

VALUE
Image_histogram_q(VALUE self)
{
    return has_attribute(self, IsHistogramImage);
}

#image_type ⇒ Magick::ImageType

Get the image type classification. For example, GrayscaleType. Don’t confuse this attribute with the format, that is “GIF” or “JPG”.

Returns:

  • (Magick::ImageType) —

    the image type



15048
15049
15050
15051
15052
15053
15054
15055
15056
15057
15058
15059
15060
15061
15062
15063
15064
15065
15066
15067
15068
 
# File 'ext/RMagick/rmimage.cpp', line 15048

VALUE Image_image_type(VALUE self)
{
    Image *image;
    ImageType type;
#if defined(IMAGEMAGICK_6)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
    type = GetImageType(image);
#else
    exception = AcquireExceptionInfo();
    type = GetImageType(image, exception);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);
#endif

    return ImageType_find(type);
}

#image_type=(image_type) ⇒ Magick::ImageType

Set the image type classification.

Parameters:

  • image_type (Magick::ImageType) —

    the image type

Returns:

  • (Magick::ImageType) —

    the given type



15077
15078
15079
15080
15081
15082
15083
15084
15085
15086
15087
15088
15089
15090
15091
15092
15093
15094
15095
15096
 
# File 'ext/RMagick/rmimage.cpp', line 15077

VALUE Image_image_type_eq(VALUE self, VALUE image_type)
{
    Image *image;
    ImageType type;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);
    VALUE_TO_ENUM(image_type, type, ImageType);
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    SetImageType(image, type, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageType(image, type);
#endif
    return image_type;
}

#implode(amount = 0.50) ⇒ Magick::Image

Implode the image by the specified percentage.

Returns a new image.

Returns:



8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
 
# File 'ext/RMagick/rmimage.cpp', line 8005

VALUE
Image_implode(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double amount = 0.50;
    ExceptionInfo *exception;

    switch (argc)
    {
        case 1:
            amount = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(ImplodeImage) args = { image, amount, image->interpolate, exception };
#else
    GVL_STRUCT_TYPE(ImplodeImage) args = { image, amount, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImplodeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#store_pixels(x, y, columns, rows, map, pixels, type = Magick::CharPixel) ⇒ Magick::Image

Store image pixel data from an array.

Returns self.

Parameters:

  • x (Numeric) —

    The x-offset of the rectangle to be replaced.

  • y (Numeric) —

    The y-offset of the rectangle to be replaced.

  • columns (Numeric) —

    The number of columns in the rectangle.

  • rows (Numeric) —

    The number of rows in the rectangle.

  • map (String) —

    his string reflects the expected ordering of the pixel array.

  • pixels (Array) —

    An array of pixels. The number of pixels in the array must be the same as the number of pixels in the rectangle, that is, rows*columns.

  • type (Magick::StorageType) (defaults to: Magick::CharPixel) —

    A StorageType value that specifies the C datatype to which the pixel data will be converted.

Returns:

See Also:



8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
 
# File 'ext/RMagick/rmimage.cpp', line 8055

VALUE
Image_import_pixels(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    long x_off, y_off;
    unsigned long cols, rows;
    unsigned long n, npixels;
    size_t buffer_l;
    char *map;
    VALUE pixel_arg, pixel_ary;
    StorageType stg_type = CharPixel;
    size_t type_sz, map_l;
    Quantum *pixels = NULL;
    double *fpixels = NULL;
    void *buffer;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    switch (argc)
    {
        case 7:
            VALUE_TO_ENUM(argv[6], stg_type, StorageType);
        case 6:
            x_off = NUM2LONG(argv[0]);
            y_off = NUM2LONG(argv[1]);
            cols = NUM2ULONG(argv[2]);
            rows = NUM2ULONG(argv[3]);
            map = StringValueCStr(argv[4]);
            pixel_arg = argv[5];
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 6 or 7)", argc);
            break;
    }

    if (x_off < 0 || y_off < 0 || cols <= 0 || rows <= 0)
    {
        rb_raise(rb_eArgError, "invalid import geometry");
    }

    map_l = rm_strnlen_s(map, MaxTextExtent);
    npixels = cols * rows * map_l;

    // Assume that any object that responds to :to_str is a string buffer containing
    // binary pixel data.
    if (rb_respond_to(pixel_arg, rb_intern("to_str")))
    {
        buffer = (void *)rm_str2cstr(pixel_arg, &buffer_l);
        switch (stg_type)
        {
            case CharPixel:
                type_sz = 1;
                break;
            case ShortPixel:
                type_sz = sizeof(unsigned short);
                break;
            case LongPixel:
                type_sz = sizeof(unsigned long);
                break;
            case DoublePixel:
                type_sz = sizeof(double);
                break;
            case FloatPixel:
                type_sz = sizeof(float);
                break;
            case QuantumPixel:
                type_sz = sizeof(Quantum);
                break;
            default:
                rb_raise(rb_eArgError, "unsupported storage type %s", StorageType_name(stg_type));
                break;
        }

        if (buffer_l % type_sz != 0)
        {
            rb_raise(rb_eArgError, "pixel buffer must be an exact multiple of the storage type size");
        }
        if ((buffer_l / type_sz) % map_l != 0)
        {
            rb_raise(rb_eArgError, "pixel buffer must contain an exact multiple of the map length");
        }
        if ((unsigned long)(buffer_l / type_sz) < npixels)
        {
            rb_raise(rb_eArgError, "pixel buffer too small (need %lu channel values, got %" RMIuSIZE ")",
                     npixels, buffer_l/type_sz);
        }
    }
    // Otherwise convert the argument to an array and convert the array elements
    // to binary pixel data.
    else
    {
        // rb_Array converts an object that is not an array to an array if possible,
        // and raises TypeError if it can't. It usually is possible.
        pixel_ary = rb_Array(pixel_arg);

        if (RARRAY_LEN(pixel_ary) % map_l != 0)
        {
            rb_raise(rb_eArgError, "pixel array must contain an exact multiple of the map length");
        }
        if ((unsigned long)RARRAY_LEN(pixel_ary) < npixels)
        {
            rb_raise(rb_eArgError, "pixel array too small (need %lu elements, got %ld)",
                     npixels, RARRAY_LEN(pixel_ary));
        }

        if (stg_type == DoublePixel || stg_type == FloatPixel)
        {
            fpixels = ALLOC_N(double, npixels);
            for (n = 0; n < npixels; n++)
            {
                VALUE element = rb_ary_entry(pixel_ary, n);
                if (rm_check_num2dbl(element))
                {
                    fpixels[n] = NUM2DBL(element);
                }
                else
                {
                    xfree(fpixels);
                    rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
                }
            }
            buffer = (void *) fpixels;
            stg_type = DoublePixel;
        }
        else
        {
            pixels = ALLOC_N(Quantum, npixels);
            for (n = 0; n < npixels; n++)
            {
                VALUE element = rb_ary_entry(pixel_ary, n);
                if (rm_check_num2dbl(element))
                {
                    pixels[n] = NUM2DBL(element);
                }
                else
                {
                    xfree(pixels);
                    rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
                }
            }
            buffer = (void *) pixels;
            stg_type = QuantumPixel;
        }
    }


#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ImportImagePixels) args = { image, x_off, y_off, cols, rows, map, stg_type, buffer, exception };
#else
    GVL_STRUCT_TYPE(ImportImagePixels) args = { image, x_off, y_off, cols, rows, map, stg_type, buffer };
#endif
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImportImagePixels), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));

    // Free pixel array before checking for errors.
    if (pixels)
    {
        xfree((void *)pixels);
    }
    if (fpixels)
    {
        xfree((void *)fpixels);
    }

    if (!okay)
    {
#if defined(IMAGEMAGICK_7)
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);
#else
        rm_check_image_exception(image, RetainOnError);
#endif
        // Shouldn't get here...
        rm_magick_error("ImportImagePixels failed with no explanation.");
    }
#if defined(IMAGEMAGICK_7)
    DestroyExceptionInfo(exception);
#endif

    RB_GC_GUARD(pixel_arg);
    RB_GC_GUARD(pixel_ary);

    return self;
}

#initialize_copy(orig) ⇒ Magick::Image

Initialize copy, clone, dup.

Parameters:

Returns:

See Also:



5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
 
# File 'ext/RMagick/rmimage.cpp', line 5000

VALUE
Image_init_copy(VALUE copy, VALUE orig)
{
    Image *image, *new_image;

    image = rm_check_destroyed(orig);
    new_image = rm_clone_image(image);
    UPDATE_DATA_PTR(copy, new_image);

    return copy;
}

#inspect ⇒ String

Override Object#inspect - return a string description of the image.

Returns:

  • (String) —

    the string



8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
 
# File 'ext/RMagick/rmimage.cpp', line 8393

VALUE
Image_inspect(VALUE self)
{
    Image *image;
    char buffer[MaxTextExtent];          // image description buffer

    TypedData_Get_Struct(self, Image, &rm_image_data_type, image);
    if (!image)
    {
        return rb_str_new2("#<Magick::Image: (destroyed)>");
    }
    build_inspect_string(image, buffer, sizeof(buffer));
    return rb_str_new2(buffer);
}

#interlace ⇒ Magick::InterlaceType

Get the type of interlacing scheme (default NoInterlace). This option is used to specify the type of interlacing scheme for raw image formats such as RGB or YUV. NoInterlace means do not interlace, LineInterlace uses scanline interlacing, and PlaneInterlace uses plane interlacing. PartitionInterlace is like PlaneInterlace except the different planes are saved to individual files (e.g. image.R, image.G, and image.B).

Returns:

  • (Magick::InterlaceType) —

    the interlace



8419
8420
8421
8422
8423
8424
 
# File 'ext/RMagick/rmimage.cpp', line 8419

VALUE
Image_interlace(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return InterlaceType_find(image->interlace);
}

#interlace=(interlace) ⇒ Magick::InterlaceType

Set the type of interlacing scheme.

Parameters:

  • interlace (Magick::InterlaceType) —

    the interlace

Returns:

  • (Magick::InterlaceType) —

    the given value



8433
8434
8435
8436
8437
8438
8439
 
# File 'ext/RMagick/rmimage.cpp', line 8433

VALUE
Image_interlace_eq(VALUE self, VALUE interlace)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(interlace, image->interlace, InterlaceType);
    return interlace;
}

#iptc_profile ⇒ String?

Return the IPTC profile as a String.

Returns:

  • (String, nil) —

    the IPTC profile if it exists, otherwise nil



8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
 
# File 'ext/RMagick/rmimage.cpp', line 8447

VALUE
Image_iptc_profile(VALUE self)
{
    Image *image;
    const StringInfo *profile;

    image = rm_check_destroyed(self);
    profile = GetImageProfile(image, "iptc");
    if (!profile)
    {
        return Qnil;
    }

    return rb_str_new((char *)profile->datum, (long)profile->length);

}

#iptc_profile=(profile) ⇒ String

Set the IPTC profile. The argument is a string.

Parameters:

  • profile (String) —

    the IPTC profile

Returns:

  • (String) —

    the given profile



8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
 
# File 'ext/RMagick/rmimage.cpp', line 8472

VALUE
Image_iptc_profile_eq(VALUE self, VALUE profile)
{
    Image_delete_profile(self, rb_str_new2("iptc"));
    if (profile != Qnil)
    {
        set_profile(self, "iptc", profile);
    }
    return profile;
}

#iterations ⇒ Object

These are undocumented methods. The writer is called only by Image#iterations=. The reader is only used by the unit tests!



8489
8490
8491
8492
8493
 
# File 'ext/RMagick/rmimage.cpp', line 8489

VALUE
Image_iterations(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, iterations, int, &rm_image_data_type);
}

#iterations=(val) ⇒ Object

do not document! Only used by Image#iterations=



8494
8495
8496
8497
8498
 
# File 'ext/RMagick/rmimage.cpp', line 8494

VALUE
Image_iterations_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, iterations, int, &rm_image_data_type);
}

#level(black_point = 0.0, white_point = nil, gamma = nil) ⇒ Object

(Thanks to Al Evans for the suggestion.)



911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
 
# File 'lib/rmagick_internal.rb', line 911

def level(black_point = 0.0, white_point = nil, gamma = nil)
  black_point = Float(black_point)

  white_point ||= Magick::QuantumRange - black_point
  white_point = Float(white_point)

  gamma_arg = gamma
  gamma ||= 1.0
  gamma = Float(gamma)

  if gamma.abs > 10.0 || white_point.abs <= 10.0 || white_point.abs < gamma.abs
    gamma, white_point = white_point, gamma
    white_point = Magick::QuantumRange - black_point unless gamma_arg
  end

  level2(black_point, white_point, gamma)
end

#level2(black_point = 0.0, white_point = Magick::QuantumRange, gamma = 1.0) ⇒ Magick::Image

Adjusts the levels of an image by scaling the colors falling between specified white and black points to the full available quantum range.

Returns a new image.

Parameters:

  • black_point (Float) (defaults to: 0.0) —

    A black point level in the range 0 - QuantumRange.

  • white_point (Float) (defaults to: Magick::QuantumRange) —

    A white point level in the range 0..QuantumRange.

  • gamma (Float) (defaults to: 1.0) —

    A gamma correction in the range 0.0 - 10.0.

Returns:



8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
8526
8527
8528
8529
8530
8531
8532
8533
8534
8535
8536
8537
8538
8539
8540
8541
8542
8543
8544
8545
8546
8547
8548
8549
8550
8551
8552
8553
8554
8555
8556
8557
8558
8559
8560
 
# File 'ext/RMagick/rmimage.cpp', line 8510

VALUE
Image_level2(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double black_point = 0.0, gamma_val = 1.0, white_point = (double)QuantumRange;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#else
    char level[50];
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 0:             // take all the defaults
            break;
        case 1:
            black_point = NUM2DBL(argv[0]);
            white_point = QuantumRange - black_point;
            break;
        case 2:
            black_point = NUM2DBL(argv[0]);
            white_point = NUM2DBL(argv[1]);
            break;
        case 3:
            black_point = NUM2DBL(argv[0]);
            white_point = NUM2DBL(argv[1]);
            gamma_val   = NUM2DBL(argv[2]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(LevelImage) args = { new_image, black_point, white_point, gamma_val, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    snprintf(level, sizeof(level), "%gx%g+%g", black_point, white_point, gamma_val);
    GVL_STRUCT_TYPE(LevelImage) args = { new_image, level };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#level_channel(aChannelType, black = 0.0, white = 1.0, gamma = Magick::QuantumRange) ⇒ Magick::Image

Similar to #level2 but applies to a single channel only.

Returns a new image.

Parameters:

  • aChannelType (Magick::ChannelType) —

    A ChannelType value.

  • black (Float) (defaults to: 0.0) —

    A black point level in the range 0..QuantumRange.

  • white (Float) (defaults to: 1.0) —

    A white point level in the range 0..QuantumRange.

  • gamma (Float) (defaults to: Magick::QuantumRange) —

    A gamma correction in the range 0.0 - 10.0.

Returns:

See Also:



8574
8575
8576
8577
8578
8579
8580
8581
8582
8583
8584
8585
8586
8587
8588
8589
8590
8591
8592
8593
8594
8595
8596
8597
8598
8599
8600
8601
8602
8603
8604
8605
8606
8607
8608
8609
8610
8611
8612
8613
8614
8615
8616
8617
8618
8619
8620
8621
8622
8623
8624
8625
8626
 
# File 'ext/RMagick/rmimage.cpp', line 8574

VALUE
Image_level_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double black_point = 0.0, gamma_val = 1.0, white_point = (double)QuantumRange;
    ChannelType channel;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:             // take all the defaults
            break;
        case 2:
            black_point = NUM2DBL(argv[1]);
            white_point = QuantumRange - black_point;
            break;
        case 3:
            black_point = NUM2DBL(argv[1]);
            white_point = NUM2DBL(argv[2]);
            break;
        case 4:
            black_point = NUM2DBL(argv[1]);
            white_point = NUM2DBL(argv[2]);
            gamma_val   = NUM2DBL(argv[3]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
            break;
    }

    VALUE_TO_ENUM(argv[0], channel, ChannelType);

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channel);
    GVL_STRUCT_TYPE(LevelImage) args = { new_image, black_point, white_point, gamma_val, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(LevelImageChannel) args = { new_image, channel, black_point, white_point, gamma_val };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#level_colors(black_color = "black", white_color = "white", invert = true, channel = Magick::AllChannels) ⇒ Magick::Image #level_colors(black_color = "black", white_color = "white", invert = true, *channels) ⇒ Magick::Image

When invert is true, black and white will be mapped to the black_color and white_color colors, compressing all other colors linearly. When invert is false, black and white will be mapped to the black_color and white_color colors, stretching all other colors linearly.

Overloads:

  • #level_colors(black_color = "black", white_color = "white", invert = true, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • black_color (Magick::Pixel, String) (defaults to: "black") —

      The color to be mapped to black

    • white_color (Magick::Pixel, String) (defaults to: "white") —

      The color to be mapped to white

    • invert (defaults to: true) —

      See the description above

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #level_colors(black_color = "black", white_color = "white", invert = true, *channels) ⇒ Magick::Image

    Parameters:

    • black_color (Magick::Pixel, String) (defaults to: "black") —

      The color to be mapped to black

    • white_color (Magick::Pixel, String) (defaults to: "white") —

      The color to be mapped to white

    • invert (defaults to: true) —

      See the description above

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



8648
8649
8650
8651
8652
8653
8654
8655
8656
8657
8658
8659
8660
8661
8662
8663
8664
8665
8666
8667
8668
8669
8670
8671
8672
8673
8674
8675
8676
8677
8678
8679
8680
8681
8682
8683
8684
8685
8686
8687
8688
8689
8690
8691
8692
8693
8694
8695
8696
8697
8698
8699
8700
8701
8702
8703
8704
8705
8706
8707
8708
8709
8710
8711
8712
8713
8714
8715
 
# File 'ext/RMagick/rmimage.cpp', line 8648

VALUE
Image_level_colors(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickPixel black_color, white_color;
    ChannelType channels;
    MagickBooleanType invert = MagickTrue;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    rm_init_magickpixel(image, &white_color);
    rm_init_magickpixel(image, &black_color);

    switch (argc)
    {
        case 3:
            invert = (MagickBooleanType)RTEST(argv[2]);

        case 2:
            Color_to_MagickPixel(image, &white_color, argv[1]);
            Color_to_MagickPixel(image, &black_color, argv[0]);
            break;

        case 1:
            rm_set_magickpixel(&white_color, "white");
            Color_to_MagickPixel(image, &black_color, argv[0]);
            break;

        case 0:
            rm_set_magickpixel(&white_color, "white");
            rm_set_magickpixel(&black_color, "black");
            break;

        default:
            raise_ChannelType_error(argv[argc-1]);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(LevelImageColors) args = { new_image, &black_color, &white_color, invert, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImageColors), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(LevelColorsImageChannel) args = { new_image, channels, &black_color, &white_color, invert };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelColorsImageChannel), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(new_image, DestroyOnError);
#endif
    if (!okay)
    {
        rb_raise(rb_eRuntimeError, "LevelImageColors failed for unknown reason.");
    }

    return rm_image_new(new_image);
}

#levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, *channels) ⇒ Magick::Image

Maps black and white to the specified points. The reverse of #level_channel.

Overloads:

  • #levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • black (Float) —

      A black point level in the range 0..QuantumRange.

    • white (Float) —

      A white point level in the range 0..QuantumRange.

    • gamma (Float) (defaults to: 1.0) —

      A gamma correction in the range 0.0 - 10.0.

  • #levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • black (Float) —

      A black point level in the range 0..QuantumRange.

    • white (Float) —

      A white point level in the range 0..QuantumRange.

    • gamma (Float) (defaults to: 1.0) —

      A gamma correction in the range 0.0 - 10.0.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



8735
8736
8737
8738
8739
8740
8741
8742
8743
8744
8745
8746
8747
8748
8749
8750
8751
8752
8753
8754
8755
8756
8757
8758
8759
8760
8761
8762
8763
8764
8765
8766
8767
8768
8769
8770
8771
8772
8773
8774
8775
8776
8777
8778
8779
8780
8781
8782
8783
8784
8785
8786
8787
8788
8789
8790
8791
8792
8793
8794
 
# File 'ext/RMagick/rmimage.cpp', line 8735

VALUE
Image_levelize_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double black_point, white_point;
    double gamma = 1.0;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 3)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    switch (argc)
    {
        case 3:
            gamma = NUM2DBL(argv[2]);
        case 2:
            white_point = NUM2DBL(argv[1]);
            black_point = NUM2DBL(argv[0]);
            break;
        case 1:
            black_point = NUM2DBL(argv[0]);
            white_point = QuantumRange - black_point;
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(LevelizeImage) args = { new_image, black_point, white_point, gamma, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelizeImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(LevelizeImageChannel) args = { new_image, channels, black_point, white_point, gamma };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelizeImageChannel), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    if (!okay)
    {
        rb_raise(rb_eRuntimeError, "LevelizeImageChannel failed for unknown reason.");
    }
    return rm_image_new(new_image);
}

#linear_stretch(black_point, white_point = pixels-black_point) ⇒ Magick::Image

Linear with saturation stretch.

Returns a new image.

Parameters:

  • black_point (Float, String) —

    black out at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’.

  • white_point (Float, String) (defaults to: pixels-black_point) —

    burn at most this many pixels. Specify an absolute number of pixels as a numeric value, or a percentage as a string in the form ‘NN%’. This argument is optional. If not specified the default is ‘(columns * rows) - black_point`.

Returns:

See Also:



8811
8812
8813
8814
8815
8816
8817
8818
8819
8820
8821
8822
8823
8824
8825
8826
8827
8828
8829
8830
8831
8832
8833
8834
8835
8836
8837
 
# File 'ext/RMagick/rmimage.cpp', line 8811

VALUE
Image_linear_stretch(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double black_point, white_point;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    get_black_white_point(image, argc, argv, &black_point, &white_point);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(LinearStretchImage) args = { new_image, black_point, white_point, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LinearStretchImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(LinearStretchImage) args = { new_image, black_point, white_point };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LinearStretchImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#liquid_rescale(columns, rows, delta_x = 0.0, rigidity = 0.0) ⇒ Magick::Image

Rescale image with seam carving.

Returns a new image.

Parameters:

  • columns (Numeric) —

    The desired width height. Should not exceed 200% of the original dimension.

  • rows (Numeric) —

    The desired height. Should not exceed 200% of the original dimension.

  • delta_x (Float) (defaults to: 0.0) —

    Maximum seam transversal step (0 means straight seams).

  • rigidity (Float) (defaults to: 0.0) —

    Introduce a bias for non-straight seams (typically 0).

Returns:



8851
8852
8853
8854
8855
8856
8857
8858
8859
8860
8861
8862
8863
8864
8865
8866
8867
8868
8869
8870
8871
8872
8873
8874
8875
8876
8877
8878
8879
8880
8881
8882
8883
8884
 
# File 'ext/RMagick/rmimage.cpp', line 8851

VALUE
Image_liquid_rescale(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned long cols, rows;
    double delta_x = 0.0;
    double rigidity = 0.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 4:
            rigidity = NUM2DBL(argv[3]);
        case 3:
            delta_x = NUM2DBL(argv[2]);
        case 2:
            rows = NUM2ULONG(argv[1]);
            cols = NUM2ULONG(argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 4)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(LiquidRescaleImage) args = { image, cols, rows, delta_x, rigidity, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LiquidRescaleImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#magnify ⇒ Magick::Image

Scale an image proportionally to twice its size.

Returns:

See Also:



9005
9006
9007
9008
9009
9010
 
# File 'ext/RMagick/rmimage.cpp', line 9005

VALUE
Image_magnify(VALUE self)
{
    rm_check_destroyed(self);
    return magnify(False, self, GVL_FUNC(MagnifyImage));
}

#magnify! ⇒ Magick::Image

Scale an image proportionally to twice its size. In-place form of #magnify.

Returns:

See Also:



9020
9021
9022
9023
9024
9025
 
# File 'ext/RMagick/rmimage.cpp', line 9020

VALUE
Image_magnify_bang(VALUE self)
{
    rm_check_frozen(self);
    return magnify(True, self, GVL_FUNC(MagnifyImage));
}

#marshal_dump ⇒ Array<String>

Support Marshal.dump.

Returns:

  • (Array<String>) —

    The first element in the array is the file name. The second element is the string of blob.



9034
9035
9036
9037
9038
9039
9040
9041
9042
9043
9044
9045
9046
9047
9048
9049
9050
9051
9052
9053
9054
9055
9056
9057
9058
9059
9060
9061
9062
9063
9064
9065
9066
9067
9068
 
# File 'ext/RMagick/rmimage.cpp', line 9034

VALUE
Image_marshal_dump(VALUE self)
{
    Image *image;
    Info *info;
    unsigned char *blob;
    size_t length;
    VALUE ary;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    info = CloneImageInfo(NULL);
    if (!info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to initialize Info object");
    }

    ary = rb_ary_new2(2);
    rb_ary_store(ary, 0, rb_str_new2(image->filename));

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ImageToBlob) args = { info, image, &length, exception };
    blob = (unsigned char *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImageToBlob), &args);

    // Destroy info before raising an exception
    DestroyImageInfo(info);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    rb_ary_store(ary, 1, rb_str_new((char *)blob, (long)length));
    magick_free((void*)blob);

    return ary;
}

#marshal_load(ary) ⇒ Object

Support Marshal.load.

Parameters:

Returns:

  • self



9077
9078
9079
9080
9081
9082
9083
9084
9085
9086
9087
9088
9089
9090
9091
9092
9093
9094
9095
9096
9097
9098
9099
9100
9101
9102
9103
9104
9105
9106
9107
9108
9109
9110
9111
9112
9113
 
# File 'ext/RMagick/rmimage.cpp', line 9077

VALUE
Image_marshal_load(VALUE self, VALUE ary)
{
    VALUE blob, filename;
    Info *info;
    Image *image;
    ExceptionInfo *exception;

    info = CloneImageInfo(NULL);
    if (!info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to initialize Info object");
    }

    filename = rb_ary_shift(ary);
    blob = rb_ary_shift(ary);

    filename = StringValue(filename);
    blob = StringValue(blob);

    exception = AcquireExceptionInfo();
    if (filename != Qnil)
    {
        strlcpy(info->filename, RSTRING_PTR(filename), sizeof(info->filename));
    }
    GVL_STRUCT_TYPE(BlobToImage) args = { info, RSTRING_PTR(blob), (size_t)RSTRING_LEN(blob), exception };
    image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlobToImage), &args);

    // Destroy info before raising an exception
    DestroyImageInfo(info);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    UPDATE_DATA_PTR(self, image);

    return self;
}

#mask ⇒ Magick::Image #mask(image) ⇒ Magick::Image

Get/Sets an image clip mask created from the specified mask image. The mask image must have the same dimensions as the image being masked. If not, the mask image is resized to match. If the mask image has an alpha channel the opacity of each pixel is used to define the mask. Otherwise, the intensity (gray level) of each pixel is used.

In general, if the mask image does not have an alpha channel, a white pixel in the mask prevents changes to the corresponding pixel in the image being masked, while a black pixel allows changes. A pixel that is neither black nor white will allow partial changes depending on its intensity.

Overloads:

Returns:



9309
9310
9311
9312
9313
9314
9315
9316
9317
9318
9319
9320
9321
9322
9323
9324
9325
9326
9327
9328
 
# File 'ext/RMagick/rmimage.cpp', line 9309

VALUE
Image_mask(int argc, VALUE *argv, VALUE self)
{
    VALUE mask;
    Image *image;

    image = rm_check_destroyed(self);
    if (argc == 0)
    {
        return get_image_mask(image);
    }
    if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (expected 0 or 1, got %d)", argc);
    }

    rb_check_frozen(self);
    mask = argv[0];
    return set_image_mask(image, mask);
}

#matte_color ⇒ String

Return the matte color.

Returns:

  • (String) —

    the matte color



9336
9337
9338
9339
9340
9341
 
# File 'ext/RMagick/rmimage.cpp', line 9336

VALUE
Image_matte_color(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return rm_pixelcolor_to_color_name(image, &image->matte_color);
}

#matte_color=(color) ⇒ Magick::Pixel, String

Set the matte color.

Parameters:

Returns:



9349
9350
9351
9352
9353
9354
9355
 
# File 'ext/RMagick/rmimage.cpp', line 9349

VALUE
Image_matte_color_eq(VALUE self, VALUE color)
{
    Image *image = rm_check_frozen(self);
    Color_to_PixelColor(&image->matte_color, color);
    return color;
}

#matte_fill_to_border(x, y) ⇒ Object

Make transparent any neighbor pixel that is not the border color.



962
963
964
965
966
 
# File 'lib/rmagick_internal.rb', line 962

def matte_fill_to_border(x, y)
  f = copy
  f.alpha(OpaqueAlphaChannel) unless f.alpha?
  f.matte_flood_fill(border_color, x, y, FillToBorderMethod, alpha: TransparentAlpha)
end

#Image ⇒ Magick::Image

Makes transparent all the pixels that are the same color as the pixel at x, y, and are neighbors.

Returns a new image.

Parameters:

  • color (Magick::Pixel, String) —

    the color name

  • x_obj (Numeric) —

    x position

  • y_obj (Numeric) —

    y position

  • method_obj (Magick::PaintMethod) —

    which method to call: FloodfillMethod or FillToBorderMethod

  • alpha (Numeric) —

    the alpha

Returns:



9369
9370
9371
9372
9373
9374
9375
9376
9377
9378
9379
9380
9381
9382
9383
9384
9385
9386
9387
9388
9389
9390
9391
9392
9393
9394
9395
9396
9397
9398
9399
9400
9401
9402
9403
9404
9405
9406
9407
9408
9409
9410
9411
9412
9413
9414
9415
9416
9417
9418
9419
9420
9421
9422
9423
9424
9425
9426
9427
9428
9429
9430
9431
9432
9433
9434
9435
9436
9437
9438
9439
9440
9441
9442
9443
9444
9445
9446
9447
9448
9449
9450
9451
9452
9453
9454
9455
9456
9457
9458
9459
9460
9461
9462
9463
9464
9465
9466
 
# File 'ext/RMagick/rmimage.cpp', line 9369

VALUE
Image_matte_flood_fill(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelColor target;
    Quantum alpha;
    long x, y;
    PaintMethod method;
    DrawInfo *draw_info;
    MagickPixel target_mpp;
    MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    if (argc != 5)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 5)", argc);
    }

    alpha = get_named_alpha_value(argv[4]);

    Color_to_PixelColor(&target, argv[0]);
    VALUE_TO_ENUM(argv[3], method, PaintMethod);
    if (!(method == FloodfillMethod || method == FillToBorderMethod))
    {
        rb_raise(rb_eArgError, "paint method_obj must be FloodfillMethod or "
                 "FillToBorderMethod (%d given)", method);
    }
    x = NUM2LONG(argv[1]);
    y = NUM2LONG(argv[2]);
    if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
    {
        rb_raise(rb_eArgError, "target out of range. %ldx%ld given, image is %" RMIuSIZE "x%" RMIuSIZE "",
                 x, y, image->columns, image->rows);
    }


    new_image = rm_clone_image(image);

    // FloodfillPaintImage looks for the opacity in the DrawInfo.fill field.
    draw_info = CloneDrawInfo(NULL, NULL);
    if (!draw_info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
#if defined(IMAGEMAGICK_7)
    rm_set_pixelinfo_alpha(&draw_info->fill, alpha);
#else
    draw_info->fill.opacity = QuantumRange - alpha;
#endif

    if (method == FillToBorderMethod)
    {
        invert = MagickTrue;
        target_mpp.red   = (MagickRealType) image->border_color.red;
        target_mpp.green = (MagickRealType) image->border_color.green;
        target_mpp.blue  = (MagickRealType) image->border_color.blue;
#if defined(IMAGEMAGICK_7)
        rm_set_pixelinfo_alpha(&target_mpp, (MagickRealType) image->border_color.alpha);
#else
        target_mpp.opacity = (MagickRealType) image->border_color.opacity;
#endif
    }
    else
    {
        invert = MagickFalse;
        target_mpp.red   = (MagickRealType) target.red;
        target_mpp.green = (MagickRealType) target.green;
        target_mpp.blue  = (MagickRealType) target.blue;
#if defined(IMAGEMAGICK_7)
        rm_set_pixelinfo_alpha(&target_mpp, (MagickRealType) target.alpha);
#else
        target_mpp.opacity = (MagickRealType) target.opacity;
#endif
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, OpacityChannel);
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, draw_info, &target_mpp, x, y, invert, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    END_CHANNEL_MASK(new_image);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, OpacityChannel, draw_info, &target_mpp, x, y, invert };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    DestroyDrawInfo(draw_info);

    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#matte_floodfill(x, y) ⇒ Object

Make transparent any pixel that matches the color of the pixel at (x,y) and is a neighbor.



954
955
956
957
958
959
 
# File 'lib/rmagick_internal.rb', line 954

def matte_floodfill(x, y)
  f = copy
  f.alpha(OpaqueAlphaChannel) unless f.alpha?
  target = f.pixel_color(x, y)
  f.matte_flood_fill(target, x, y, FloodfillMethod, alpha: TransparentAlpha)
end

#matte_point(x, y) ⇒ Object

Make the pixel at (x,y) transparent.



934
935
936
937
938
939
940
941
 
# File 'lib/rmagick_internal.rb', line 934

def matte_point(x, y)
  f = copy
  f.alpha(OpaqueAlphaChannel) unless f.alpha?
  pixel = f.pixel_color(x, y)
  pixel.alpha = TransparentAlpha
  f.pixel_color(x, y, pixel)
  f
end

#matte_replace(x, y) ⇒ Object

Make transparent all pixels that are the same color as the pixel at (x, y).



945
946
947
948
949
950
 
# File 'lib/rmagick_internal.rb', line 945

def matte_replace(x, y)
  f = copy
  f.alpha(OpaqueAlphaChannel) unless f.alpha?
  target = f.pixel_color(x, y)
  f.transparent(target)
end

#matte_reset! ⇒ Object

Make all pixels transparent.



969
970
971
972
 
# File 'lib/rmagick_internal.rb', line 969

def matte_reset!
  alpha(TransparentAlphaChannel)
  self
end

#mean_error_per_pixel ⇒ Float

Get the mean error per pixel computed when a image is color reduced.

Returns:

  • (Float) —

    the mean error per pixel



9511
9512
9513
9514
9515
 
# File 'ext/RMagick/rmimage.cpp', line 9511

VALUE
Image_mean_error_per_pixel(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READERF(Image, mean_error_per_pixel, error.mean_error_per_pixel, dbl, &rm_image_data_type);
}

#median_filter(radius = 0.0) ⇒ Magick::Image

Apply a digital filter that improves the quality of a noisy image. Each pixel is replaced by the median in a set of neighboring pixels as defined by radius.

Returns a new image.

Parameters:

  • radius (Numeric) (defaults to: 0.0) —

    The filter radius.

Returns:



9477
9478
9479
9480
9481
9482
9483
9484
9485
9486
9487
9488
9489
9490
9491
9492
9493
9494
9495
9496
9497
9498
9499
9500
9501
9502
9503
 
# File 'ext/RMagick/rmimage.cpp', line 9477

VALUE
Image_median_filter(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(StatisticImage) args = { image, MedianStatistic, (size_t)radius, (size_t)radius, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(StatisticImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#mime_type ⇒ String?

Return the officially registered (or de facto) MIME media-type corresponding to the image format.

Returns:

  • (String, nil) —

    the mime type



9523
9524
9525
9526
9527
9528
9529
9530
9531
9532
9533
9534
9535
9536
9537
9538
9539
9540
9541
9542
9543
9544
 
# File 'ext/RMagick/rmimage.cpp', line 9523

VALUE
Image_mime_type(VALUE self)
{
    Image *image;
    char *type;
    VALUE mime_type;

    image = rm_check_destroyed(self);
    type = MagickToMime(image->magick);
    if (!type)
    {
        return Qnil;
    }
    mime_type = rb_str_new2(type);

    // The returned string must be deallocated by the user.
    magick_free(type);

    RB_GC_GUARD(mime_type);

    return mime_type;
}

#minify ⇒ Magick::Image

Scale an image proportionally to half its size.

Returns:

See Also:



9553
9554
9555
9556
9557
9558
 
# File 'ext/RMagick/rmimage.cpp', line 9553

VALUE
Image_minify(VALUE self)
{
    rm_check_destroyed(self);
    return magnify(False, self, GVL_FUNC(MinifyImage));
}

#minify! ⇒ Magick::Image

Scale an image proportionally to half its size. In-place form of #minify.

Returns:

See Also:



9567
9568
9569
9570
9571
9572
 
# File 'ext/RMagick/rmimage.cpp', line 9567

VALUE
Image_minify_bang(VALUE self)
{
    rm_check_frozen(self);
    return magnify(True, self, GVL_FUNC(MinifyImage));
}

#modulate(brightness = 1.0, saturation = 1.0, hue = 1.0) ⇒ Magick::Image

Changes the brightness, saturation, and hue.

Returns a new image.

Parameters:

  • brightness (Float) (defaults to: 1.0) —

    The percent change in the brightness

  • saturation (Float) (defaults to: 1.0) —

    The percent change in the saturation

  • hue (Float) (defaults to: 1.0) —

    The percent change in the hue

Returns:



9584
9585
9586
9587
9588
9589
9590
9591
9592
9593
9594
9595
9596
9597
9598
9599
9600
9601
9602
9603
9604
9605
9606
9607
9608
9609
9610
9611
9612
9613
9614
9615
9616
9617
9618
9619
9620
9621
9622
9623
9624
9625
9626
9627
9628
9629
9630
9631
9632
9633
9634
 
# File 'ext/RMagick/rmimage.cpp', line 9584

VALUE
Image_modulate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double pct_brightness = 100.0,
    pct_saturation = 100.0,
    pct_hue        = 100.0;
    char modulate[100];
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 3:
            pct_hue        = 100*NUM2DBL(argv[2]);
        case 2:
            pct_saturation = 100*NUM2DBL(argv[1]);
        case 1:
            pct_brightness = 100*NUM2DBL(argv[0]);
            break;
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
            break;
    }

    if (pct_brightness <= 0.0)
    {
        rb_raise(rb_eArgError, "brightness is %g%%, must be positive", pct_brightness);
    }
    snprintf(modulate, sizeof(modulate), "%f%%,%f%%,%f%%", pct_brightness, pct_saturation, pct_hue);

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ModulateImage) args = { new_image, modulate, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ModulateImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(ModulateImage) args = { new_image, modulate };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ModulateImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#monochrome? ⇒ Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities and the intensity is either 0 or QuantumRange.

Returns:

  • (Boolean) —

    true if monochrome, false otherwise



9643
9644
9645
9646
9647
9648
9649
9650
9651
 
# File 'ext/RMagick/rmimage.cpp', line 9643

VALUE
Image_monochrome_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return has_image_attribute(self, IsImageMonochrome);
#else
    return has_attribute(self, IsMonochromeImage);
#endif
}

#montage ⇒ String

Tile size and offset within an image montage. Only valid for montage images.

Returns:

  • (String) —

    the tile size and offset



9659
9660
9661
9662
9663
 
# File 'ext/RMagick/rmimage.cpp', line 9659

VALUE
Image_montage(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, montage, str, &rm_image_data_type);
}

#morphology(method_v, iterations, kernel_v) ⇒ Magick::Image

Apply a user supplied kernel to the image according to the given mophology method.

Parameters:

  • method_v (Magick::MorphologyMethod) —

    the morphology method

  • iterations (Numeric) —

    apply the operation this many times (or no change). A value of -1 means loop until no change found. How this is applied may depend on the morphology method. Typically this is a value of 1.

  • kernel_v (Magick::KernelInfo) —

    morphology kernel to apply

Returns:



4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
 
# File 'ext/RMagick/rmimage.cpp', line 4692

VALUE
Image_morphology(VALUE self, VALUE method_v, VALUE iterations, VALUE kernel_v)
{
    static VALUE default_channels_const = 0;

    if(!default_channels_const)
    {
        default_channels_const = rb_const_get(Module_Magick, rb_intern("DefaultChannels"));
    }

    return Image_morphology_channel(self, default_channels_const, method_v, iterations, kernel_v);
}

#morphology_channel(channel_v, method_v, iterations, kernel_v) ⇒ Magick::Image

Apply a user supplied kernel to the image channel according to the given mophology method.

Parameters:

  • channel_v (Magick::ChannelType) —

    a channel type

  • method_v (Magick::MorphologyMethod) —

    the morphology method

  • iterations (Numeric) —

    apply the operation this many times (or no change). A value of -1 means loop until no change found. How this is applied may depend on the morphology method. Typically this is a value of 1.

  • kernel_v (Magick::KernelInfo) —

    morphology kernel to apply

Returns:



4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
 
# File 'ext/RMagick/rmimage.cpp', line 4718

VALUE
Image_morphology_channel(VALUE self, VALUE channel_v, VALUE method_v, VALUE iterations, VALUE kernel_v)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    MorphologyMethod method;
    ChannelType channel;
    KernelInfo *kernel;

    image = rm_check_destroyed(self);

    VALUE_TO_ENUM(method_v, method, MorphologyMethod);
    VALUE_TO_ENUM(channel_v, channel, ChannelType);
    Check_Type(iterations, T_FIXNUM);

    if (TYPE(kernel_v) == T_STRING)
    {
        kernel_v = rb_class_new_instance(1, &kernel_v, Class_KernelInfo);
    }

    if (!rb_obj_is_kind_of(kernel_v, Class_KernelInfo))
    {
        rb_raise(rb_eArgError, "expected String or Magick::KernelInfo");
    }

    TypedData_Get_Struct(kernel_v, KernelInfo, &rm_kernel_info_data_type, kernel);

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channel);
    GVL_STRUCT_TYPE(MorphologyImage) args = { image, method, NUM2LONG(iterations), kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MorphologyImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(MorphologyImageChannel) args = { image, channel, method, NUM2LONG(iterations), kernel, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MorphologyImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#motion_blur(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image

Simulate motion blur. Convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and motion_blur selects a suitable radius for you. Angle gives the angle of the blurring motion.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation

  • angle (Float) (defaults to: 0.0) —

    The angle (in degrees)

Returns:



9735
9736
9737
9738
9739
9740
 
# File 'ext/RMagick/rmimage.cpp', line 9735

VALUE
Image_motion_blur(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return motion_blur(argc, argv, self, GVL_FUNC(MotionBlurImage));
}

#negate(grayscale = false) ⇒ Magick::Image

Negate the colors in the reference image. The grayscale option means that only grayscale values within the image are negated.

Returns a new image.

Parameters:

  • grayscale (Boolean) (defaults to: false) —

    If the grayscale argument is true, only the grayscale values are negated.

Returns:



9751
9752
9753
9754
9755
9756
9757
9758
9759
9760
9761
9762
9763
9764
9765
9766
9767
9768
9769
9770
9771
9772
9773
9774
9775
9776
9777
9778
9779
9780
9781
9782
9783
9784
9785
 
# File 'ext/RMagick/rmimage.cpp', line 9751

VALUE
Image_negate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    if (argc == 1)
    {
        grayscale = (MagickBooleanType)RTEST(argv[0]);
    }
    else if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(NegateImage) args = { new_image, grayscale, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(NegateImage) args = { new_image, grayscale };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#negate_channel(grayscale = false, channel = Magick::AllChannels) ⇒ Magick::Image #negate_channel(grayscale = false, *channels) ⇒ Magick::Image

Negate the colors on a particular channel. The grayscale option means that only grayscale values within the image are negated.

Overloads:

  • #negate_channel(grayscale = false, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • grayscale (Boolean) (defaults to: false) —

      If the grayscale argument is true, only the grayscale values are negated.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #negate_channel(grayscale = false, *channels) ⇒ Magick::Image

    Parameters:

    • grayscale (Boolean) (defaults to: false) —

      If the grayscale argument is true, only the grayscale values are negated.

    • channel (Magick::ChannelType) —

      a ChannelType arguments.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



9805
9806
9807
9808
9809
9810
9811
9812
9813
9814
9815
9816
9817
9818
9819
9820
9821
9822
9823
9824
9825
9826
9827
9828
9829
9830
9831
9832
9833
9834
9835
9836
9837
9838
9839
9840
9841
9842
9843
9844
9845
 
# File 'ext/RMagick/rmimage.cpp', line 9805

VALUE
Image_negate_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    MagickBooleanType grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There can be at most 1 remaining argument.
    if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    else if (argc == 1)
    {
        grayscale = (MagickBooleanType)RTEST(argv[0]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(NegateImage) args = { new_image, grayscale, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(NegateImageChannel) args = { new_image, channels, grayscale };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#normalize ⇒ Magick::Image

Enhance the contrast of a color image by adjusting the pixels color to span the entire range of colors available.

Returns:



9982
9983
9984
9985
9986
9987
9988
9989
9990
9991
9992
9993
9994
9995
9996
9997
9998
9999
10000
10001
10002
10003
10004
10005
10006
 
# File 'ext/RMagick/rmimage.cpp', line 9982

VALUE
Image_normalize(VALUE self)
{
    Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(NormalizeImage) args = { new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NormalizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(NormalizeImage) args = { new_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NormalizeImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#normalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image

Enhances the contrast of a color image by adjusting the pixel color to span the entire range of colors available. Only the specified channels are normalized.

Returns a new image.

Parameters:

  • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

    a ChannelType arguments.

Returns:



10017
10018
10019
10020
10021
10022
10023
10024
10025
10026
10027
10028
10029
10030
10031
10032
10033
10034
10035
10036
10037
10038
10039
10040
10041
10042
10043
10044
10045
10046
10047
10048
10049
10050
10051
 
# File 'ext/RMagick/rmimage.cpp', line 10017

VALUE
Image_normalize_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    // Ensure all arguments consumed.
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(NormalizeImage) args = { new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NormalizeImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(NormalizeImageChannel) args = { new_image, channels };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NormalizeImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#normalized_maximum_error ⇒ Float

Get The normalized maximum error per pixel computed when an image is color reduced.

Returns:

  • (Float) —

    the normalized maximum error



10070
10071
10072
10073
10074
 
# File 'ext/RMagick/rmimage.cpp', line 10070

VALUE
Image_normalized_maximum_error(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READERF(Image, normalized_maximum_error, error.normalized_maximum_error, dbl, &rm_image_data_type);
}

#normalized_mean_error ⇒ Float

Get the normalized mean error per pixel computed when an image is color reduced.

Returns:

  • (Float) —

    the normalized mean error



10059
10060
10061
10062
10063
 
# File 'ext/RMagick/rmimage.cpp', line 10059

VALUE
Image_normalized_mean_error(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READERF(Image, normalized_mean_error, error.normalized_mean_error, dbl, &rm_image_data_type);
}

#number_colors ⇒ Numeric

Return the number of unique colors in the image.

Returns:

  • (Numeric) —

    number of unique colors



10082
10083
10084
10085
10086
10087
10088
10089
10090
10091
10092
10093
10094
10095
10096
10097
10098
10099
 
# File 'ext/RMagick/rmimage.cpp', line 10082

VALUE
Image_number_colors(VALUE self)
{
    Image *image;
    ExceptionInfo *exception;
    size_t n = 0;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(GetNumberColors) args = { image, NULL, exception };
    n = (size_t)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetNumberColors), &args);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return ULONG2NUM(n);
}

#offset ⇒ Number

Get the number of bytes to skip over when reading raw image.

Returns:

  • (Number) —

    the offset



10107
10108
10109
10110
10111
 
# File 'ext/RMagick/rmimage.cpp', line 10107

VALUE
Image_offset(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, offset, long, &rm_image_data_type);
}

#offset=(val) ⇒ Number

Set the number of bytes to skip over when reading raw image.

Parameters:

  • val (Number) —

    the offset

Returns:

  • (Number) —

    the given offset



10119
10120
10121
10122
10123
 
# File 'ext/RMagick/rmimage.cpp', line 10119

VALUE
Image_offset_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, offset, long, &rm_image_data_type);
}

#oil_paint(radius = 3.0) ⇒ Magick::Image

Apply a special effect filter that simulates an oil painting.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 3.0) —

    The radius of the Gaussian in pixels.

Returns:



10133
10134
10135
10136
10137
10138
10139
10140
10141
10142
10143
10144
10145
10146
10147
10148
10149
10150
10151
10152
10153
10154
10155
10156
10157
10158
10159
10160
10161
10162
10163
10164
10165
10166
10167
 
# File 'ext/RMagick/rmimage.cpp', line 10133

VALUE
Image_oil_paint(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 3.0;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    double sigma = 1.0;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(OilPaintImage) args = { image, radius, sigma, exception };
#else
    GVL_STRUCT_TYPE(OilPaintImage) args = { image, radius, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OilPaintImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#opaque(target, fill) ⇒ Magick::Image

Change any pixel that matches target with the color defined by fill.

- By default a pixel must match the specified target color exactly.
- Use {Image#fuzz=} to set the amount of tolerance acceptable to consider two colors as the
  same.

Parameters:

Returns:

See Also:



10182
10183
10184
10185
10186
10187
10188
10189
10190
10191
10192
10193
10194
10195
10196
10197
10198
10199
10200
10201
10202
10203
10204
10205
10206
10207
10208
10209
10210
10211
10212
10213
10214
10215
10216
10217
10218
10219
10220
10221
10222
10223
 
# File 'ext/RMagick/rmimage.cpp', line 10182

VALUE
Image_opaque(VALUE self, VALUE target, VALUE fill)
{
    Image *image, *new_image;
    MagickPixel target_pp;
    MagickPixel fill_pp;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    // Allow color name or Pixel
    Color_to_MagickPixel(image, &target_pp, target);
    Color_to_MagickPixel(image, &fill_pp, fill);

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(OpaquePaintImage) args = { new_image, &target_pp, &fill_pp, MagickFalse, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OpaquePaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(OpaquePaintImageChannel) args = { new_image, DefaultChannels, &target_pp, &fill_pp, MagickFalse };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OpaquePaintImageChannel), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);
}

#opaque? ⇒ Boolean

Returns true if all of the pixels in the receiver have an opacity value of OpaqueOpacity.

Returns:

  • (Boolean) —

    true if opaque, false otherwise



10329
10330
10331
10332
10333
10334
10335
10336
10337
 
# File 'ext/RMagick/rmimage.cpp', line 10329

VALUE
Image_opaque_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return has_attribute(self, IsImageOpaque);
#else
    return has_attribute(self, IsOpaqueImage);
#endif
}

#opaque_channel(target, fill, invert = false, fuzz = self.fuzz, channel = Magick::AllChannels) ⇒ Magick::Image #opaque_channel(target, fill, invert, fuzz, *channels) ⇒ Magick::Image

Changes all pixels having the target color to the fill color. If invert is true, changes all the pixels that are not the target color to the fill color.

Overloads:

  • #opaque_channel(target, fill, invert = false, fuzz = self.fuzz, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • target (Magick::Pixel, String) —

      the color name

    • fill (Magick::Pixel, String) —

      the color for filling

    • invert (Boolean) (defaults to: false) —

      If true, the target pixels are all the pixels that are not the target color. The default is the value of the target image’s fuzz attribute

    • fuzz (Float) (defaults to: self.fuzz) —

      Colors within this distance are considered equal to the target color.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #opaque_channel(target, fill, invert, fuzz, *channels) ⇒ Magick::Image

    Parameters:

    • target (Magick::Pixel, String) —

      the color name

    • fill (Magick::Pixel, String) —

      the color for filling

    • invert (Boolean) —

      If true, the target pixels are all the pixels that are not the target color. The default is the value of the target image’s fuzz attribute

    • fuzz (Float) —

      Colors within this distance are considered equal to the target color.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



10248
10249
10250
10251
10252
10253
10254
10255
10256
10257
10258
10259
10260
10261
10262
10263
10264
10265
10266
10267
10268
10269
10270
10271
10272
10273
10274
10275
10276
10277
10278
10279
10280
10281
10282
10283
10284
10285
10286
10287
10288
10289
10290
10291
10292
10293
10294
10295
10296
10297
10298
10299
10300
10301
10302
10303
10304
10305
10306
10307
10308
10309
10310
10311
10312
10313
10314
10315
10316
10317
10318
10319
10320
10321
 
# File 'ext/RMagick/rmimage.cpp', line 10248

VALUE
Image_opaque_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickPixel target_pp, fill_pp;
    ChannelType channels;
    double keep, fuzz;
    MagickBooleanType okay, invert = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 4)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    // Default fuzz value is image's fuzz attribute.
    fuzz = image->fuzz;

    switch (argc)
    {
        case 4:
            fuzz = NUM2DBL(argv[3]);
            if (fuzz < 0.0)
            {
                rb_raise(rb_eArgError, "fuzz must be >= 0.0 (%g given)", fuzz);
            }
        case 3:
            invert = (MagickBooleanType)RTEST(argv[2]);
        case 2:
            // Allow color name or Pixel
            Color_to_MagickPixel(image, &fill_pp, argv[1]);
            Color_to_MagickPixel(image, &target_pp, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (got %d, expected 2 or more)", argc);
            break;
    }

    new_image = rm_clone_image(image);
    keep = new_image->fuzz;
    new_image->fuzz = fuzz;

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(OpaquePaintImage) args = { new_image, &target_pp, &fill_pp, invert, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OpaquePaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    END_CHANNEL_MASK(new_image);
    new_image->fuzz = keep;
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(OpaquePaintImageChannel) args = { new_image, channels, &target_pp, &fill_pp, invert };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OpaquePaintImageChannel), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));

    new_image->fuzz = keep;
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);
}

#ordered_dither(threshold_map = '2x2') ⇒ Magick::Image

Dithers the image to a predefined pattern. The threshold_map argument defines the pattern to use.

  • Default threshold_map is ‘2x2’

  • Order of threshold_map must be 2, 3, or 4.

Returns a new image.

Parameters:

  • threshold_map (String, Numeric) (defaults to: '2x2') —

    the threshold

Returns:



10350
10351
10352
10353
10354
10355
10356
10357
10358
10359
10360
10361
10362
10363
10364
10365
10366
10367
10368
10369
10370
10371
10372
10373
10374
10375
10376
10377
10378
10379
10380
10381
10382
10383
10384
10385
10386
10387
10388
10389
10390
10391
10392
10393
10394
10395
10396
10397
10398
10399
10400
10401
10402
10403
10404
 
# File 'ext/RMagick/rmimage.cpp', line 10350

VALUE
Image_ordered_dither(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    int order;
    const char *threshold_map = "2x2";
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }
    if (argc == 1)
    {
        if (TYPE(argv[0]) == T_STRING)
        {
            threshold_map = StringValueCStr(argv[0]);
        }
        else
        {
            order = NUM2INT(argv[0]);
            if (order == 3)
            {
                threshold_map = "3x3";
            }
            else if (order == 4)
            {
                threshold_map = "4x4";
            }
            else if (order != 2)
            {
                rb_raise(rb_eArgError, "order must be 2, 3, or 4 (%d given)", order);
            }
        }
    }

    new_image = rm_clone_image(image);

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(OrderedDitherImage) args = { new_image, threshold_map, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OrderedDitherImage), &args);
#else
    GVL_STRUCT_TYPE(OrderedPosterizeImage) args = { new_image, threshold_map, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OrderedPosterizeImage), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#orientation ⇒ Magick::OrientationType

Get the value of the Exif Orientation Tag.

Returns:

  • (Magick::OrientationType) —

    the orientation



10412
10413
10414
10415
10416
10417
 
# File 'ext/RMagick/rmimage.cpp', line 10412

VALUE
Image_orientation(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return OrientationType_find(image->orientation);
}

#orientation=(orientation) ⇒ Magick::OrientationType

Set the orientation attribute.

Parameters:

  • orientation (Magick::OrientationType) —

    the orientation

Returns:

  • (Magick::OrientationType) —

    the given value



10426
10427
10428
10429
10430
10431
10432
 
# File 'ext/RMagick/rmimage.cpp', line 10426

VALUE
Image_orientation_eq(VALUE self, VALUE orientation)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(orientation, image->orientation, OrientationType);
    return orientation;
}

#page ⇒ Magick::Rectangle

The page attribute getter.

Returns:

  • (Magick::Rectangle) —

    the page rectangle



10440
10441
10442
10443
10444
10445
 
# File 'ext/RMagick/rmimage.cpp', line 10440

VALUE
Image_page(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return Import_RectangleInfo(&image->page);
}

#page=(rect) ⇒ Magick::Rectangle

The page attribute setter.

Parameters:

  • rect (Magick::Rectangle) —

    the page rectangle

Returns:

  • (Magick::Rectangle) —

    the given value



10454
10455
10456
10457
10458
10459
10460
 
# File 'ext/RMagick/rmimage.cpp', line 10454

VALUE
Image_page_eq(VALUE self, VALUE rect)
{
    Image *image = rm_check_frozen(self);
    Export_RectangleInfo(&image->page, rect);
    return rect;
}

#paint_transparent(target, invert, fuzz, alpha: Magick::TransparentAlpha) ⇒ Magick::Image

Changes the opacity value of all the pixels that match color to the value specified by opacity. If invert is true, changes the pixels that don’t match color.

Returns a new image.

Parameters:

  • target (Magick::Pixel, String) —

    the color name

  • invert (Boolean) —

    If true, the target pixels are all the pixels that are not the target color.

  • fuzz (Float) —

    By default the pixel must match exactly, but you can specify a tolerance level by passing a positive value.

  • alpha (Numeric) (defaults to: Magick::TransparentAlpha) —

    The new alpha value, either an alpha value or a number between 0 and QuantumRange. The default is TransparentAlpha.

Returns:



10477
10478
10479
10480
10481
10482
10483
10484
10485
10486
10487
10488
10489
10490
10491
10492
10493
10494
10495
10496
10497
10498
10499
10500
10501
10502
10503
10504
10505
10506
10507
10508
10509
10510
10511
10512
10513
10514
10515
10516
10517
10518
10519
10520
10521
10522
10523
10524
10525
10526
10527
10528
10529
10530
10531
10532
10533
10534
10535
10536
10537
10538
10539
10540
10541
10542
10543
10544
10545
10546
10547
10548
10549
10550
10551
10552
10553
10554
10555
10556
10557
 
# File 'ext/RMagick/rmimage.cpp', line 10477

VALUE
Image_paint_transparent(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickPixel color;
    Quantum alpha = TransparentAlpha;
    double keep, fuzz;
    MagickBooleanType okay, invert;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    // Default fuzz value is image's fuzz attribute.
    fuzz = image->fuzz;
    invert = MagickFalse;

    switch (argc)
    {
        case 4:
            if (TYPE(argv[argc - 1]) == T_HASH)
            {
                fuzz = NUM2DBL(argv[2]);
            }
            else
            {
                fuzz = NUM2DBL(argv[3]);
            }
        case 3:
            if (TYPE(argv[argc - 1]) == T_HASH)
            {
                invert = (MagickBooleanType)RTEST(argv[1]);
            }
            else
            {
                invert = (MagickBooleanType)RTEST(argv[2]);
            }
        case 2:
            alpha = get_named_alpha_value(argv[argc - 1]);
        case 1:
            Color_to_MagickPixel(image, &color, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
            break;
    }

    new_image = rm_clone_image(image);

    // Use fuzz value from caller
    keep = new_image->fuzz;
    new_image->fuzz = fuzz;

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(TransparentPaintImage) args = { new_image, (const MagickPixel *)&color, alpha, invert, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    new_image->fuzz = keep;
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(TransparentPaintImage) args = { new_image, (const MagickPixel *)&color, (Quantum)(QuantumRange - alpha), invert };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    new_image->fuzz = keep;

    // Is it possible for TransparentPaintImage to silently fail?
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);
}

#palette? ⇒ Boolean

Return true if the image is PseudoClass and has 256 unique colors or less.

Returns:

  • (Boolean) —

    true if palette, otherwise false



10565
10566
10567
10568
10569
10570
10571
10572
10573
 
# File 'ext/RMagick/rmimage.cpp', line 10565

VALUE
Image_palette_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return has_image_attribute(self, IsPaletteImage);
#else
    return has_attribute(self, IsPaletteImage);
#endif
}

#pixel_color(x, y) ⇒ Magick::Pixel #pixel_color(x, y, color) ⇒ Magick::Pixel

Get/set the color of the pixel at x, y.

Overloads:

  • #pixel_color(x, y) ⇒ Magick::Pixel

    Get the color

    Parameters:

    • x (Numeric) —

      The x-coordinates of the pixel.

    • y (Numeric) —

      The y-coordinates of the pixel.

    Returns:

  • #pixel_color(x, y, color) ⇒ Magick::Pixel

    Set the color

    Parameters:

    • x (Numeric) —

      The x-coordinates of the pixel.

    • y (Numeric) —

      The y-coordinates of the pixel.

    • color (Magick::Pixel, String) —

      the color

    Returns:



10605
10606
10607
10608
10609
10610
10611
10612
10613
10614
10615
10616
10617
10618
10619
10620
10621
10622
10623
10624
10625
10626
10627
10628
10629
10630
10631
10632
10633
10634
10635
10636
10637
10638
10639
10640
10641
10642
10643
10644
10645
10646
10647
10648
10649
10650
10651
10652
10653
10654
10655
10656
10657
10658
10659
10660
10661
10662
10663
10664
10665
10666
10667
10668
10669
10670
10671
10672
10673
10674
10675
10676
10677
10678
10679
10680
10681
10682
10683
10684
10685
10686
10687
10688
10689
10690
10691
10692
10693
10694
10695
10696
10697
10698
10699
10700
10701
10702
10703
10704
10705
10706
10707
10708
10709
10710
10711
10712
10713
10714
10715
10716
10717
10718
10719
10720
10721
10722
10723
10724
10725
10726
10727
10728
10729
10730
10731
10732
10733
10734
10735
10736
10737
10738
10739
10740
10741
10742
10743
10744
10745
10746
10747
10748
10749
10750
10751
10752
10753
10754
10755
10756
10757
10758
10759
10760
10761
10762
10763
10764
10765
10766
10767
10768
10769
10770
10771
10772
10773
10774
10775
 
# File 'ext/RMagick/rmimage.cpp', line 10605

VALUE
Image_pixel_color(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    Pixel new_color;
    PixelPacket old_color;
    ExceptionInfo *exception;
    long x, y;
    unsigned int set = False;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    Quantum *pixel;
    const Quantum *old_pixel;
#else
    PixelPacket *pixel;
    const PixelPacket *old_pixel;
    MagickPixel mpp;
    IndexPacket *indexes;
#endif

    memset(&old_color, 0, sizeof(old_color));

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 3:
            rb_check_frozen(self);
            set = True;
            // Replace with new color? The arg can be either a color name or
            // a Magick::Pixel.
            Color_to_Pixel(&new_color, argv[2]);
        case 2:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    x = NUM2LONG(argv[0]);
    y = NUM2LONG(argv[1]);

    // Get the color of a pixel
    if (!set)
    {
        exception = AcquireExceptionInfo();
        GVL_STRUCT_TYPE(GetVirtualPixels) args = { image, x, y, 1, 1, exception };
        void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetVirtualPixels), &args);
        old_pixel = reinterpret_cast<decltype(old_pixel)>(ret);
        CHECK_EXCEPTION();

        DestroyExceptionInfo(exception);

#if defined(IMAGEMAGICK_7)
        old_color.red   = GetPixelRed(image, old_pixel);
        old_color.green = GetPixelGreen(image, old_pixel);
        old_color.blue  = GetPixelBlue(image, old_pixel);
        old_color.alpha = GetPixelAlpha(image, old_pixel);
        old_color.black = GetPixelBlack(image, old_pixel);
        return Pixel_from_PixelPacket(&old_color);
#else
        old_color = *old_pixel;
        indexes = GetAuthenticIndexQueue(image);
        // PseudoClass
        if (image->storage_class == PseudoClass)
        {
            old_color = image->colormap[(unsigned long)*indexes];
        }
        if (!image->matte)
        {
            old_color.opacity = OpaqueOpacity;
        }

        rm_init_magickpixel(image, &mpp);
        mpp.red = GetPixelRed(&old_color);
        mpp.green = GetPixelGreen(&old_color);
        mpp.blue = GetPixelBlue(&old_color);
        mpp.opacity = GetPixelOpacity(&old_color);
        if (indexes)
        {
            mpp.index = GetPixelIndex(indexes);
        }
        return Pixel_from_MagickPixel(&mpp);
#endif
    }

    // ImageMagick segfaults if the pixel location is out of bounds.
    // Do what IM does and return the background color.
    if (x < 0 || y < 0 || (unsigned long)x >= image->columns || (unsigned long)y >= image->rows)
    {
        return Pixel_from_PixelColor(&image->background_color);
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
#endif

    if (image->storage_class == PseudoClass)
    {
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, DirectClass, exception };
        void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
        okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
        CHECK_EXCEPTION();
        if (!okay)
        {
            DestroyExceptionInfo(exception);
            rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
        }
#else
        GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, DirectClass };
        void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
        okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
        rm_check_image_exception(image, RetainOnError);
        if (!okay)
        {
            rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
        }
#endif
    }

#if defined(IMAGEMAGICK_6)
    exception = AcquireExceptionInfo();
#endif

    GVL_STRUCT_TYPE(GetAuthenticPixels) args = { image, x, y, 1, 1, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetAuthenticPixels), &args);
    pixel = reinterpret_cast<decltype(pixel)>(ret);
    CHECK_EXCEPTION();

    if (pixel)
    {
#if defined(IMAGEMAGICK_7)
        old_color.red   = GetPixelRed(image, pixel);
        old_color.green = GetPixelGreen(image, pixel);
        old_color.blue  = GetPixelBlue(image, pixel);
        old_color.alpha = GetPixelAlpha(image, pixel);
        old_color.black = GetPixelBlack(image, pixel);

        SetPixelRed(image,   new_color.red,   pixel);
        SetPixelGreen(image, new_color.green, pixel);
        SetPixelBlue(image,  new_color.blue,  pixel);
        SetPixelAlpha(image, new_color.alpha, pixel);
        SetPixelBlack(image, new_color.black, pixel);
#else
        old_color = *pixel;
        indexes = GetAuthenticIndexQueue(image);
        if (!image->matte)
        {
            old_color.opacity = OpaqueOpacity;
        }

        SetPixelRed(pixel,     new_color.red);
        SetPixelGreen(pixel,   new_color.green);
        SetPixelBlue(pixel,    new_color.blue);
        SetPixelOpacity(pixel, new_color.opacity);
        if (indexes)
        {
            SetPixelIndex(indexes, new_color.black);
        }
#endif

        GVL_STRUCT_TYPE(SyncAuthenticPixels) args = { image, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SyncAuthenticPixels), &args);
        CHECK_EXCEPTION();
    }

    DestroyExceptionInfo(exception);

    return Pixel_from_PixelPacket(&old_color);
}

#pixel_interpolation_method ⇒ Magick::PixelInterpolateMethod

Get the “interpolate” field.

Returns:

  • (Magick::PixelInterpolateMethod) —

    the interpolate field

See Also:



10784
10785
10786
10787
10788
10789
 
# File 'ext/RMagick/rmimage.cpp', line 10784

VALUE
Image_pixel_interpolation_method(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return PixelInterpolateMethod_find(image->interpolate);
}

#pixel_interpolation_method=(method) ⇒ Magick::PixelInterpolateMethod

Set the “interpolate” field.

Parameters:

  • method (Magick::PixelInterpolateMethod) —

    the interpolate field

Returns:

  • (Magick::PixelInterpolateMethod) —

    the given method

See Also:



10799
10800
10801
10802
10803
10804
10805
 
# File 'ext/RMagick/rmimage.cpp', line 10799

VALUE
Image_pixel_interpolation_method_eq(VALUE self, VALUE method)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(method, image->interpolate, PixelInterpolateMethod);
    return method;
}

#polaroid(angle = -5.0) ⇒ Magick::Image #polaroid(angle = -5.0) {|Magick::Image::Info| ... } ⇒ Magick::Image

Produce an image that looks like a Polaroid instant picture. If the image has a “Caption” property, the value is used as a caption.

The following annotate attributes control the label rendering: align, decorate, density, encoding, fill, font, font_family, font_stretch, font_style, font_weight, gravity, pointsize, stroke, stroke_width, text_antialias, undercolor.

Overloads:

  • #polaroid(angle = -5.0) ⇒ Magick::Image

    Parameters:

    • angle (Float) (defaults to: -5.0) —

      The resulting image is rotated by this amount, measured in degrees.

  • #polaroid(angle = -5.0) {|Magick::Image::Info| ... } ⇒ Magick::Image

    If present a block, optional arguments may be specified in a block associated with the method. These arguments control the shadow color and how the label is rendered. By default the shadow color is gray75. To specify a different shadow color, use options.shadow_color. To specify a different border color (that is, the color of the image border) use options.border_color. Both of these methods accept either a color name or a Pixel argument.

    Parameters:

    • angle (Float) (defaults to: -5.0) —

      The resulting image is rotated by this amount, measured in degrees.

    Yields:

Returns:



10831
10832
10833
10834
10835
10836
10837
10838
10839
10840
10841
10842
10843
10844
10845
10846
10847
10848
10849
10850
10851
10852
10853
10854
10855
10856
10857
10858
10859
10860
10861
10862
10863
10864
10865
10866
10867
10868
10869
10870
10871
10872
10873
10874
10875
10876
10877
10878
10879
10880
 
# File 'ext/RMagick/rmimage.cpp', line 10831

VALUE
Image_polaroid(int argc, VALUE *argv, VALUE self)
{
    Image *image, *clone, *new_image;
    VALUE options;
    double angle = -5.0;
    Draw *draw;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    const char *caption;
#endif

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 1:
            angle = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    options = rm_polaroid_new();
    TypedData_Get_Struct(options, Draw, &rm_draw_data_type, draw);

    clone = rm_clone_image(image);
    clone->background_color = draw->shadow_color;
    clone->border_color = draw->info->border_color;

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    caption = GetImageProperty(clone, "Caption", exception);
    GVL_STRUCT_TYPE(PolaroidImage) args = { clone, draw->info, caption, angle, image->interpolate, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(PolaroidImage), &args);
#else
    GVL_STRUCT_TYPE(PolaroidImage) args = { clone, draw->info, angle, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(PolaroidImage), &args);
#endif
    rm_check_exception(exception, clone, DestroyOnError);

    DestroyImage(clone);
    DestroyExceptionInfo(exception);

    RB_GC_GUARD(options);

    return rm_image_new(new_image);
}

#posterize(levels = 4, dither = false) ⇒ Object

Reduces the image to a limited number of colors for a “poster” effect.

Returns a new image.

Parameters:

  • levels (Numeric) (defaults to: 4) —

    number of input arguments

  • dither (Boolean) (defaults to: false) —

    array of input arguments

Returns:

  • a new image



10891
10892
10893
10894
10895
10896
10897
10898
10899
10900
10901
10902
10903
10904
10905
10906
10907
10908
10909
10910
10911
10912
10913
10914
10915
10916
10917
10918
10919
10920
10921
10922
10923
10924
10925
10926
10927
10928
10929
10930
10931
10932
10933
 
# File 'ext/RMagick/rmimage.cpp', line 10891

VALUE
Image_posterize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType dither = MagickFalse;
    unsigned long levels = 4;
#if defined(IMAGEMAGICK_7)
    DitherMethod dither_method;
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 2:
            dither = (MagickBooleanType) RTEST(argv[1]);
            /* fall through */
        case 1:
            levels = NUM2ULONG(argv[0]);
            /* fall through */
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    dither_method = dither ? RiemersmaDitherMethod : NoDitherMethod;
    GVL_STRUCT_TYPE(PosterizeImage) args = { new_image, levels, dither_method, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(PosterizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(PosterizeImage) args = { new_image, levels, dither };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(PosterizeImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#preview(preview) ⇒ Magick::Image

Creates an image that contains 9 small versions of the receiver image. The center image is the unchanged receiver. The other 8 images are variations created by transforming the receiver according to the specified preview type with varying parameters.

Returns:



10943
10944
10945
10946
10947
10948
10949
10950
10951
10952
10953
10954
10955
10956
10957
10958
10959
10960
10961
 
# File 'ext/RMagick/rmimage.cpp', line 10943

VALUE
Image_preview(VALUE self, VALUE preview)
{
    Image *image, *new_image;
    PreviewType preview_type;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    VALUE_TO_ENUM(preview, preview_type, PreviewType);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(PreviewImage) args = { image, preview_type, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(PreviewImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#profile!(name, profile) ⇒ Magick::Image

Set the image profile. If “profile” is nil, deletes the profile. Otherwise “profile” must be a string containing the specified profile.

Parameters:

  • name (String) —

    The profile name, or “*” to represent all the profiles in the image.

  • profile (String) —

    The profile value, or nil to cause the profile to be removed.

Returns:



10972
10973
10974
10975
10976
10977
10978
10979
10980
10981
10982
10983
10984
10985
 
# File 'ext/RMagick/rmimage.cpp', line 10972

VALUE
Image_profile_bang(VALUE self, VALUE name, VALUE profile)
{

    if (profile == Qnil)
    {
        return Image_delete_profile(self, name);
    }
    else
    {
        return set_profile(self, StringValueCStr(name), profile);
    }

}

#properties ⇒ Hash #properties {|Magick::Image::Info| ... } ⇒ Magick::Image

If called with an associated block, properties runs the block once for each property defined for the image. The block arguments are the property name and its value. If there is no block, properties returns a hash with one element for each property. The hash key is the property name and the associated value is the property value.

Overloads:



12853
12854
12855
12856
12857
12858
12859
12860
12861
12862
12863
12864
12865
12866
12867
12868
12869
12870
12871
12872
12873
12874
12875
12876
12877
12878
12879
12880
12881
12882
12883
12884
12885
12886
12887
12888
12889
12890
12891
12892
12893
12894
12895
12896
12897
12898
12899
12900
12901
12902
12903
12904
12905
12906
12907
12908
12909
12910
12911
12912
12913
12914
12915
12916
12917
12918
12919
12920
12921
12922
12923
12924
12925
12926
12927
 
# File 'ext/RMagick/rmimage.cpp', line 12853

VALUE
Image_properties(VALUE self)
{
    Image *image;
    VALUE attr_hash, ary;
    const char *property, *value;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
#endif

    if (rb_block_given_p())
    {
        ary = rb_ary_new2(2);

        ResetImagePropertyIterator(image);
        property = GetNextImageProperty(image);
        while (property)
        {
#if defined(IMAGEMAGICK_7)
            value = GetImageProperty(image, property, exception);
#else
            value = GetImageProperty(image, property);
#endif
            rb_ary_store(ary, 0, rb_str_new2(property));
            rb_ary_store(ary, 1, rb_str_new2(value));
            rb_yield(ary);
            property = GetNextImageProperty(image);
        }
#if defined(IMAGEMAGICK_7)
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);
#else
        rm_check_image_exception(image, RetainOnError);
#endif

        RB_GC_GUARD(ary);

        return self;
    }

    // otherwise return properties hash
    else
    {
        attr_hash = rb_hash_new();
        ResetImagePropertyIterator(image);
        property = GetNextImageProperty(image);
        while (property)
        {
#if defined(IMAGEMAGICK_7)
            value = GetImageProperty(image, property, exception);
#else
            value = GetImageProperty(image, property);
#endif
            rb_hash_aset(attr_hash, rb_str_new2(property), rb_str_new2(value));
            property = GetNextImageProperty(image);
        }
#if defined(IMAGEMAGICK_7)
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);
#else
        rm_check_image_exception(image, RetainOnError);
#endif

        RB_GC_GUARD(attr_hash);

        return attr_hash;
    }

}

#quality ⇒ Numeric

Get image quality.

Returns:

  • (Numeric) —

    the quality



10993
10994
10995
10996
10997
 
# File 'ext/RMagick/rmimage.cpp', line 10993

VALUE
Image_quality(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, quality, ulong, &rm_image_data_type);
}

#quantize(number_colors = 256, colorspace = Magick::RGBColorspace, dither = true, tree_depth = 0, measure_error = false) ⇒ Magick::Image

Analyzes the colors within a reference image and chooses a fixed number of colors to represent the image. The goal of the algorithm is to minimize the difference between the input and output image while minimizing the processing time.

Returns a new image.

Parameters:

  • number_colors (Numeric) (defaults to: 256) —

    The maximum number of colors in the result image.

  • colorspace (Magick::ColorspaceType) (defaults to: Magick::RGBColorspace) —

    The colorspace to quantize in.

  • dither (Boolean) (defaults to: true) —

    If true, Magick::RiemersmaDitherMethod will be used as DitherMethod. otherwise NoDitherMethod.

  • tree_depth (Numeric) (defaults to: 0) —

    The tree depth to use while quantizing. The values 0 and 1 support automatic tree depth determination. The tree depth may be forced via values ranging from 2 to

    1. The ideal tree depth depends on the characteristics of the input image, and may be

    determined through experimentation.

  • measure_error (Boolean) (defaults to: false) —

    Set to true to calculate quantization errors when quantizing the image.

Returns:



11215
11216
11217
11218
11219
11220
11221
11222
11223
11224
11225
11226
11227
11228
11229
11230
11231
11232
11233
11234
11235
11236
11237
11238
11239
11240
11241
11242
11243
11244
11245
11246
11247
11248
11249
11250
11251
11252
11253
11254
11255
11256
11257
11258
11259
11260
11261
11262
11263
11264
11265
11266
11267
11268
11269
11270
11271
11272
11273
11274
11275
 
# File 'ext/RMagick/rmimage.cpp', line 11215

VALUE
Image_quantize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 5:
            quantize_info.measure_error = (MagickBooleanType) RTEST(argv[4]);
        case 4:
            quantize_info.tree_depth = NUM2UINT(argv[3]);
        case 3:
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
                quantize_info.dither = (MagickBooleanType)(quantize_info.dither_method != NoDitherMethod);
#endif
            }
            else
            {
#if defined(IMAGEMAGICK_7)
                quantize_info.dither_method = RTEST(argv[2]) ? RiemersmaDitherMethod : NoDitherMethod;
#else
                quantize_info.dither = (MagickBooleanType) RTEST(argv[2]);
#endif
            }
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.colorspace, ColorspaceType);
        case 1:
            quantize_info.number_colors = NUM2UINT(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(QuantizeImage) args = { &quantize_info, new_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(QuantizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(QuantizeImage) args = { &quantize_info, new_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(QuantizeImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#quantum_depth ⇒ Numeric

Return the image depth to the nearest Quantum (8, 16, or 32).

Returns:

  • (Numeric) —

    image depth



11005
11006
11007
11008
11009
11010
11011
11012
11013
11014
11015
 
# File 'ext/RMagick/rmimage.cpp', line 11005

VALUE
Image_quantum_depth(VALUE self)
{
    Image *image;
    unsigned long quantum_depth;

    image = rm_check_destroyed(self);
    quantum_depth = GetImageQuantumDepth(image, MagickFalse);

    return ULONG2NUM(quantum_depth);
}

#quantum_operator(quantum_expression_op, rvalue, channel = Magick::AllChannels) ⇒ Magick::Image #quantum_operator(quantum_expression_op, rvalue, *channels) ⇒ Magick::Image

Performs the requested integer arithmetic operation on the selected channel of the image. This method allows simple arithmetic operations on the component values of all pixels in an image. Of course, you could also do this in Ruby using get_pixels and store_pixels, or view, but quantum_operator will be faster, especially for large numbers of pixels, since it does not need to convert the pixels from C to Ruby.

Overloads:

  • #quantum_operator(quantum_expression_op, rvalue, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • quantum_expression_op (Magick::QuantumExpressionOperator) —

      the operator

    • rvalue (Float) —

      the operation rvalue.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #quantum_operator(quantum_expression_op, rvalue, *channels) ⇒ Magick::Image

    Parameters:

    • quantum_expression_op (Magick::QuantumExpressionOperator) —

      the operator

    • rvalue (Float) —

      the operation rvalue.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



11038
11039
11040
11041
11042
11043
11044
11045
11046
11047
11048
11049
11050
11051
11052
11053
11054
11055
11056
11057
11058
11059
11060
11061
11062
11063
11064
11065
11066
11067
11068
11069
11070
11071
11072
11073
11074
11075
11076
11077
11078
11079
11080
11081
11082
11083
11084
11085
11086
11087
11088
11089
11090
11091
11092
11093
11094
11095
11096
11097
11098
11099
11100
11101
11102
11103
11104
11105
11106
11107
11108
11109
11110
11111
11112
11113
11114
11115
11116
11117
11118
11119
11120
11121
11122
11123
11124
11125
11126
11127
11128
11129
11130
11131
11132
11133
11134
11135
11136
11137
11138
11139
11140
11141
11142
11143
11144
11145
11146
11147
11148
11149
11150
11151
11152
11153
11154
11155
11156
11157
11158
11159
11160
11161
11162
11163
11164
11165
11166
11167
11168
11169
11170
11171
11172
11173
11174
11175
11176
11177
11178
11179
11180
11181
11182
11183
11184
11185
11186
11187
11188
11189
11190
11191
11192
11193
11194
 
# File 'ext/RMagick/rmimage.cpp', line 11038

VALUE
Image_quantum_operator(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    QuantumExpressionOperator quantum_expression_op;
    MagickEvaluateOperator qop;
    double rvalue;
    ChannelType channel;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    // The default channel is AllChannels
    channel = AllChannels;

    /*
        If there are 3 arguments, argument 2 is a ChannelType argument.
        Arguments 1 and 0 are required and are the rvalue and operator,
        respectively.
    */
    switch (argc)
    {
        case 3:
            VALUE_TO_ENUM(argv[2], channel, ChannelType);
            /* Fall through */
        case 2:
            rvalue = NUM2DBL(argv[1]);
            VALUE_TO_ENUM(argv[0], quantum_expression_op, QuantumExpressionOperator);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    // Map QuantumExpressionOperator to MagickEvaluateOperator
    switch (quantum_expression_op)
    {
        default:
        case UndefinedQuantumOperator:
            qop = UndefinedEvaluateOperator;
            break;
        case AddQuantumOperator:
            qop = AddEvaluateOperator;
            break;
        case AndQuantumOperator:
            qop = AndEvaluateOperator;
            break;
        case DivideQuantumOperator:
            qop = DivideEvaluateOperator;
            break;
        case LShiftQuantumOperator:
            qop = LeftShiftEvaluateOperator;
            break;
        case MaxQuantumOperator:
            qop = MaxEvaluateOperator;
            break;
        case MinQuantumOperator:
            qop = MinEvaluateOperator;
            break;
        case MultiplyQuantumOperator:
            qop = MultiplyEvaluateOperator;
            break;
        case OrQuantumOperator:
            qop = OrEvaluateOperator;
            break;
        case RShiftQuantumOperator:
            qop = RightShiftEvaluateOperator;
            break;
        case SubtractQuantumOperator:
            qop = SubtractEvaluateOperator;
            break;
        case XorQuantumOperator:
            qop = XorEvaluateOperator;
            break;
        case PowQuantumOperator:
            qop = PowEvaluateOperator;
            break;
        case LogQuantumOperator:
            qop = LogEvaluateOperator;
            break;
        case ThresholdQuantumOperator:
            qop = ThresholdEvaluateOperator;
            break;
        case ThresholdBlackQuantumOperator:
            qop = ThresholdBlackEvaluateOperator;
            break;
        case ThresholdWhiteQuantumOperator:
            qop = ThresholdWhiteEvaluateOperator;
            break;
        case GaussianNoiseQuantumOperator:
            qop = GaussianNoiseEvaluateOperator;
            break;
        case ImpulseNoiseQuantumOperator:
            qop = ImpulseNoiseEvaluateOperator;
            break;
        case LaplacianNoiseQuantumOperator:
            qop = LaplacianNoiseEvaluateOperator;
            break;
        case MultiplicativeNoiseQuantumOperator:
            qop = MultiplicativeNoiseEvaluateOperator;
            break;
        case PoissonNoiseQuantumOperator:
            qop = PoissonNoiseEvaluateOperator;
            break;
        case UniformNoiseQuantumOperator:
            qop = UniformNoiseEvaluateOperator;
            break;
        case CosineQuantumOperator:
            qop = CosineEvaluateOperator;
            break;
        case SetQuantumOperator:
            qop = SetEvaluateOperator;
            break;
        case SineQuantumOperator:
            qop = SineEvaluateOperator;
            break;
        case AddModulusQuantumOperator:
            qop = AddModulusEvaluateOperator;
            break;
        case MeanQuantumOperator:
            qop = MeanEvaluateOperator;
            break;
        case AbsQuantumOperator:
            qop = AbsEvaluateOperator;
            break;
        case ExponentialQuantumOperator:
            qop = ExponentialEvaluateOperator;
            break;
        case MedianQuantumOperator:
            qop = MedianEvaluateOperator;
            break;
        case SumQuantumOperator:
            qop = SumEvaluateOperator;
            break;
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
        case RootMeanSquareQuantumOperator:
            qop = RootMeanSquareEvaluateOperator;
            break;
#endif
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channel);
    GVL_STRUCT_TYPE(EvaluateImage) args = { image, qop, rvalue, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EvaluateImage), &args);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(EvaluateImageChannel) args = { image, channel, qop, rvalue, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EvaluateImageChannel), &args);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return self;
}

#radial_blur(angle_obj) ⇒ Magick::Image

Applies a radial blur to the image.

Parameters:

  • angle_obj (Float) —

    the angle (in degrees)

Returns:



11284
11285
11286
11287
11288
11289
11290
11291
11292
11293
11294
11295
11296
11297
11298
11299
11300
11301
11302
11303
11304
11305
11306
11307
 
# File 'ext/RMagick/rmimage.cpp', line 11284

VALUE
Image_radial_blur(VALUE self, VALUE angle_obj)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    double angle = NUM2DBL(angle_obj);

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
    GVL_STRUCT_TYPE(RotationalBlurImage) args = { image, angle, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RotationalBlurImage), &args);
    new_image = reinterpret_cast<decltype(new_image)>(ret);
#else
    GVL_STRUCT_TYPE(RadialBlurImage) args = { image, angle, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RadialBlurImage), &args);
    new_image = reinterpret_cast<decltype(new_image)>(ret);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#radial_blur_channel(angle, channel = Magick::AllChannels) ⇒ Magick::Image #radial_blur_channel(angle, *channels) ⇒ Magick::Image

Applies a radial blur to the selected image channels.

Overloads:

  • #radial_blur_channel(angle, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • angle (Float) —

      the angle (in degrees)

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #radial_blur_channel(angle, *channels) ⇒ Magick::Image

    Parameters:

    • angle (Float) —

      the angle (in degrees)

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



11323
11324
11325
11326
11327
11328
11329
11330
11331
11332
11333
11334
11335
11336
11337
11338
11339
11340
11341
11342
11343
11344
11345
11346
11347
11348
11349
11350
11351
11352
11353
11354
11355
11356
11357
11358
11359
11360
11361
11362
11363
11364
 
# File 'ext/RMagick/rmimage.cpp', line 11323

VALUE
Image_radial_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    ChannelType channels;
    double angle;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    angle = NUM2DBL(argv[0]);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(RotationalBlurImage) args = { image, angle, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RotationalBlurImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#elif defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
    GVL_STRUCT_TYPE(RotationalBlurImageChannel) args = { image, channels, angle, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RotationalBlurImageChannel), &args);
#else
    GVL_STRUCT_TYPE(RadialBlurImageChannel) args = { image, channels, angle, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RadialBlurImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#raise(width = 6, height = 6, raised = true) ⇒ Magick::Image

Create a simulated three-dimensional button-like effect by lightening and darkening the edges of the image. The “width” and “height” arguments define the width of the vertical and horizontal edge of the effect. If “raised” is true, creates a raised effect, otherwise a lowered effect.

Returns a new image.

Parameters:

  • width (Numeric) (defaults to: 6) —

    The width of the raised edge in pixels.

  • height (Numeric) (defaults to: 6) —

    The height of the raised edge in pixels.

  • raised (Boolean) (defaults to: true) —

    If true, the image is raised, otherwise lowered.

Returns:



11448
11449
11450
11451
11452
11453
11454
11455
11456
11457
11458
11459
11460
11461
11462
11463
11464
11465
11466
11467
11468
11469
11470
11471
11472
11473
11474
11475
11476
11477
11478
11479
11480
11481
11482
11483
11484
11485
11486
11487
11488
11489
11490
11491
11492
11493
 
# File 'ext/RMagick/rmimage.cpp', line 11448

VALUE
Image_raise(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    RectangleInfo rect;
    MagickBooleanType raised = MagickTrue;      // default
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    memset(&rect, 0, sizeof(rect));
    rect.width = 6;         // default
    rect.height = 6;        // default

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 3:
            raised = (MagickBooleanType)RTEST(argv[2]);
        case 2:
            rect.height = NUM2ULONG(argv[1]);
        case 1:
            rect.width = NUM2ULONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(RaiseImage) args = { new_image, &rect, raised, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RaiseImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(RaiseImage) args = { new_image, &rect, raised };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RaiseImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#random_threshold_channel(geometry_str, channel = Magick::AllChannels) ⇒ Magick::Image #random_threshold_channel(geometry_str, *channels) ⇒ Magick::Image

Changes the value of individual pixels based on the intensity of each pixel compared to a random threshold. The result is a low-contrast, two color image.

Overloads:

  • #random_threshold_channel(geometry_str, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • geometry_str (String) —

      A geometry string containing LOWxHIGH thresholds.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #random_threshold_channel(geometry_str, *channels) ⇒ Magick::Image

    Parameters:

    • geometry_str (String) —

      A geometry string containing LOWxHIGH thresholds.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:

See Also:



11382
11383
11384
11385
11386
11387
11388
11389
11390
11391
11392
11393
11394
11395
11396
11397
11398
11399
11400
11401
11402
11403
11404
11405
11406
11407
11408
11409
11410
11411
11412
11413
11414
11415
11416
11417
11418
11419
11420
11421
11422
11423
11424
11425
11426
11427
11428
11429
11430
11431
11432
11433
11434
 
# File 'ext/RMagick/rmimage.cpp', line 11382

VALUE
Image_random_threshold_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    char *thresholds;
    VALUE geom_str;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // There must be 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "missing threshold argument");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    // Accept any argument that has a to_s method.
    geom_str = rb_String(argv[0]);
    thresholds = StringValueCStr(geom_str);

    new_image = rm_clone_image(image);

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(new_image, channels);
    {
        GeometryInfo geometry_info;

        ParseGeometry(thresholds, &geometry_info);
        GVL_STRUCT_TYPE(RandomThresholdImage) args = { new_image, geometry_info.rho, geometry_info.sigma, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RandomThresholdImage), &args);
    }
    END_CHANNEL_MASK(new_image);
#else
    GVL_STRUCT_TYPE(RandomThresholdImageChannel) args = { new_image, channels, thresholds, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RandomThresholdImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(geom_str);

    return rm_image_new(new_image);
}

#recolor(color_matrix) ⇒ Magick::Image

Use this method to translate, scale, shear, or rotate image colors. Although you can use variable sized matrices, typically you use a 5x5 for an RGBA image and a 6x6 for CMYKA. Populate the last row with normalized values to translate.

Parameters:

  • color_matrix (Array<Float>) —

    An array of Float values representing the recolor matrix.

Returns:



11632
11633
11634
11635
11636
11637
11638
11639
11640
11641
11642
11643
11644
11645
11646
11647
11648
11649
11650
11651
11652
11653
11654
11655
11656
11657
11658
11659
11660
11661
11662
11663
11664
11665
11666
11667
11668
11669
11670
11671
11672
11673
11674
11675
11676
11677
11678
11679
11680
11681
11682
11683
11684
11685
11686
11687
11688
11689
11690
11691
11692
11693
11694
11695
11696
11697
11698
11699
11700
 
# File 'ext/RMagick/rmimage.cpp', line 11632

VALUE
Image_recolor(VALUE self, VALUE color_matrix)
{
    Image *image, *new_image;
    unsigned long order;
    long x, len;
    double *matrix;
    ExceptionInfo *exception;
    KernelInfo *kernel_info;

    image = rm_check_destroyed(self);
    color_matrix = rm_check_ary_type(color_matrix);

    // Allocate color matrix from Ruby's memory
    len = RARRAY_LEN(color_matrix);
    matrix = ALLOC_N(double, len);

    for (x = 0; x < len; x++)
    {
        VALUE element = rb_ary_entry(color_matrix, x);
        if (rm_check_num2dbl(element))
        {
            matrix[x] = NUM2DBL(element);
        }
        else
        {
            xfree(matrix);
            rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
        }
    }

    order = (unsigned long)sqrt((double)(len + 1.0));

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    kernel_info = AcquireKernelInfo(NULL, exception);
    if (rm_should_raise_exception(exception, RetainExceptionRetention))
    {
        if (kernel_info != (KernelInfo *) NULL)
        {
            DestroyKernelInfo(kernel_info);
        }
        xfree((void *)matrix);
        rm_raise_exception(exception);
    }
#else
    kernel_info = AcquireKernelInfo(NULL);
#endif
    if (kernel_info == (KernelInfo *) NULL)
    {
        xfree((void *) matrix);
        DestroyExceptionInfo(exception);
        return Qnil;
    }
    kernel_info->width = order;
    kernel_info->height = order;
    kernel_info->values = (double *) matrix;

    GVL_STRUCT_TYPE(ColorMatrixImage) args = { image, kernel_info, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ColorMatrixImage), &args);
    kernel_info->values = (double *) NULL;
    DestroyKernelInfo(kernel_info);
    xfree((void *) matrix);

    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#reduce_noise(radius) ⇒ Magick::Image

Smooth the contours of an image while still preserving edge information.

Parameters:

  • radius (Numeric) —

    A neighbor is defined by radius. Use a radius of 0 and reduce_noise selects a suitable radius for you.

Returns:



11805
11806
11807
11808
11809
11810
11811
11812
11813
11814
11815
11816
11817
11818
11819
11820
11821
11822
 
# File 'ext/RMagick/rmimage.cpp', line 11805

VALUE
Image_reduce_noise(VALUE self, VALUE radius)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    size_t radius_size = NUM2SIZET(radius);

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(StatisticImage) args = { image, NonpeakStatistic, radius_size, radius_size, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(StatisticImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#remap(remap_image, dither_method = Magick::RiemersmaDitherMethod) ⇒ Object Also known as: affinity

Reduce the number of colors in img to the colors used by remap_image. If a dither method is specified then the given colors are dithered over the image as necessary, otherwise the closest color (in RGB colorspace) is selected to replace that pixel in the image.

Returns self.

Parameters:

  • remap_image (Magick::Image, Magick::ImageList) —

    The reference image or imagelist. If an imagelist, uses the current image.

  • dither_method (Magick::DitherMethod) (defaults to: Magick::RiemersmaDitherMethod) —

    this object

Returns:

  • self



11836
11837
11838
11839
11840
11841
11842
11843
11844
11845
11846
11847
11848
11849
11850
11851
11852
11853
11854
11855
11856
11857
11858
11859
11860
11861
11862
11863
11864
11865
11866
11867
11868
11869
11870
11871
11872
11873
11874
11875
11876
11877
11878
11879
 
# File 'ext/RMagick/rmimage.cpp', line 11836

VALUE
Image_remap(int argc, VALUE *argv, VALUE self)
{
    Image *image, *remap_image;
    QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
            quantize_info.dither = MagickTrue;
#endif
            break;
        case 1:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    remap_image = rm_check_destroyed(rm_cur_image(argv[0]));

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(RemapImage) args = { &quantize_info, image, remap_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemapImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(RemapImage) args = { &quantize_info, image, remap_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemapImage), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#rendering_intent ⇒ Magick::RenderingIntent

Get the type of rendering intent.

Returns:

  • (Magick::RenderingIntent) —

    the rendering intent



11887
11888
11889
11890
11891
11892
 
# File 'ext/RMagick/rmimage.cpp', line 11887

VALUE
Image_rendering_intent(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return RenderingIntent_find(image->rendering_intent);
}

#rendering_intent=(ri) ⇒ Magick::RenderingIntent

Set the type of rendering intent..

Parameters:

  • ri (Magick::RenderingIntent) —

    the rendering intent

Returns:

  • (Magick::RenderingIntent) —

    the given value



11901
11902
11903
11904
11905
11906
11907
 
# File 'ext/RMagick/rmimage.cpp', line 11901

VALUE
Image_rendering_intent_eq(VALUE self, VALUE ri)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(ri, image->rendering_intent, RenderingIntent);
    return ri;
}

#resample(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick

Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.

Resize the image so that its rendered size remains the same as the original at the specified target resolution. For example, if a 300 DPI image renders at 3 inches by 2 inches on a 300 DPI device, when the image has been resampled to 72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of storing the image resolution. For formats which do not support an image resolution, the original resolution of the image must be specified via the density attribute prior to specifying the resample resolution.

Returns a new image.

Parameters:

  • x_resolution (Float) (defaults to: 72.0) —

    the target horizontal resolution.

  • y_resolution (Float) (defaults to: 72.0) —

    the target vertical resolution.

  • filter (Magick::FilterType) (defaults to: self.filter) —

    the filter type

  • blur (Float) (defaults to: self.blur) —

    the blur size

Returns:

See Also:



12068
12069
12070
12071
12072
12073
 
# File 'ext/RMagick/rmimage.cpp', line 12068

VALUE
Image_resample(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return resample(False, argc, argv, self);
}

#resample!(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick

Resample image to specified horizontal resolution, vertical resolution, filter and blur factor. In-place form of #resample.

Returns a new image.

Parameters:

  • x_resolution (Float) (defaults to: 72.0) —

    the target horizontal resolution.

  • y_resolution (Float) (defaults to: 72.0) —

    the target vertical resolution.

  • filter (Magick::FilterType) (defaults to: self.filter) —

    the filter type

  • blur (Float) (defaults to: self.blur) —

    the blur size

Returns:

See Also:



12088
12089
12090
12091
12092
12093
 
# File 'ext/RMagick/rmimage.cpp', line 12088

VALUE
Image_resample_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return resample(True, argc, argv, self);
}

#resize(scale) ⇒ Magick::Image #resize(cols, rows, filter, blur) ⇒ Magick::Image

Scale an image to the desired dimensions using the specified filter and blur factor.

Overloads:

  • #resize(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #resize(cols, rows, filter, blur) ⇒ Magick::Image

    Parameters:

    • cols (Float) —

      The desired width

    • rows (Float) —

      The desired height.

    • filter (Magick::FilterType) —

      the filter type

    • blur (Float) —

      the blur size

Returns:

See Also:



12211
12212
12213
12214
12215
12216
 
# File 'ext/RMagick/rmimage.cpp', line 12211

VALUE
Image_resize(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return resize(False, argc, argv, self);
}

#resize!(scale) ⇒ Magick::Image #resize!(cols, rows, filter, blur) ⇒ Magick::Image

Scale an image to the desired dimensions using the specified filter and blur factor. In-place form of #resize.

Overloads:

  • #resize!(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #resize!(cols, rows, filter, blur) ⇒ Magick::Image

    Parameters:

    • cols (Float) —

      The desired width

    • rows (Float) —

      The desired height.

    • filter (Magick::FilterType) —

      the filter type

    • blur (Float) —

      the blur size

Returns:

See Also:



12237
12238
12239
12240
12241
12242
 
# File 'ext/RMagick/rmimage.cpp', line 12237

VALUE
Image_resize_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return resize(True, argc, argv, self);
}

#resize_to_fill(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object Also known as: crop_resized

Force an image to exact dimensions without changing the aspect ratio. Resize and crop if necessary. (Thanks to Jerett Taylor!)



976
977
978
 
# File 'lib/rmagick_internal.rb', line 976

def resize_to_fill(ncols, nrows = nil, gravity = CenterGravity)
  copy.resize_to_fill!(ncols, nrows, gravity)
end

#resize_to_fill!(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object Also known as: crop_resized! 



980
981
982
983
984
985
986
987
988
 
# File 'lib/rmagick_internal.rb', line 980

def resize_to_fill!(ncols, nrows = nil, gravity = CenterGravity)
  nrows ||= ncols
  if ncols != columns || nrows != rows
    scale = [ncols / columns.to_f, nrows / rows.to_f].max
    resize!(scale * columns + 0.5, scale * rows + 0.5)
  end
  crop!(gravity, ncols, nrows, true) if ncols != columns || nrows != rows
  self
end

#resize_to_fit(cols, rows = nil) ⇒ Object

Convenience method to resize retaining the aspect ratio. (Thanks to Robert Manni!)



996
997
998
999
1000
1001
 
# File 'lib/rmagick_internal.rb', line 996

def resize_to_fit(cols, rows = nil)
  rows ||= cols
  change_geometry(Geometry.new(cols, rows)) do |ncols, nrows|
    resize(ncols, nrows)
  end
end

#resize_to_fit!(cols, rows = nil) ⇒ Object 



1003
1004
1005
1006
1007
1008
 
# File 'lib/rmagick_internal.rb', line 1003

def resize_to_fit!(cols, rows = nil)
  rows ||= cols
  change_geometry(Geometry.new(cols, rows)) do |ncols, nrows|
    resize!(ncols, nrows)
  end
end

#roll(x_offset, y_offset) ⇒ Magick::Image

Offset an image as defined by x_offset and y_offset.

Parameters:

  • x_offset (Numeric) —

    the x offset

  • y_offset (Numeric) —

    the y offset

Returns:



12252
12253
12254
12255
12256
12257
12258
12259
12260
12261
12262
12263
12264
12265
12266
12267
12268
12269
 
# File 'ext/RMagick/rmimage.cpp', line 12252

VALUE
Image_roll(VALUE self, VALUE x_offset, VALUE y_offset)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    ssize_t x = NUM2LONG(x_offset);
    ssize_t y = NUM2LONG(y_offset);

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(RollImage) args = { image, x, y, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RollImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#rotate(degrees) ⇒ Magick::Image #rotate(degrees, qualifier) ⇒ Magick::Image

Rotate the receiver by the specified angle. Positive angles rotate clockwise while negative angles rotate counter-clockwise. New pixels introduced by the rotation are the same color as the current background color. Set the background color to “none” to make the new pixels transparent black.

Overloads:

  • #rotate(degrees) ⇒ Magick::Image

    Parameters:

    • degrees (Float) —

      The number of degrees to rotate the image.

  • #rotate(degrees, qualifier) ⇒ Magick::Image

    Parameters:

    • degrees (Float) —

      The number of degrees to rotate the image.

    • qualifier (String) —

      If present, either “>” or “<”. If “>”, rotates the image only if the image’s width exceeds its height. If “<” rotates the image only if its height exceeds its width. If this argument is omitted the image is always rotated.

Returns:

See Also:



12356
12357
12358
12359
12360
12361
 
# File 'ext/RMagick/rmimage.cpp', line 12356

VALUE
Image_rotate(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return rotate(False, argc, argv, self);
}

#rotate!(degrees) ⇒ Magick::Image #rotate!(degrees, qualifier) ⇒ Magick::Image

Rotate the image. In-place form of #rotate.

Overloads:

  • #rotate!(degrees) ⇒ Magick::Image

    Parameters:

    • degrees (Float) —

      The number of degrees to rotate the image.

  • #rotate!(degrees, qualifier) ⇒ Magick::Image

    Parameters:

    • degrees (Float) —

      The number of degrees to rotate the image.

    • qualifier (String) —

      If present, either “>” or “<”. If “>”, rotates the image only if the image’s width exceeds its height. If “<” rotates the image only if its height exceeds its width. If this argument is omitted the image is always rotated.

Returns:

See Also:



12380
12381
12382
12383
12384
12385
 
# File 'ext/RMagick/rmimage.cpp', line 12380

VALUE
Image_rotate_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return rotate(True, argc, argv, self);
}

#rows ⇒ Numeric

Return image rows.

Returns:

  • (Numeric) —

    the image rows



12393
12394
12395
12396
12397
 
# File 'ext/RMagick/rmimage.cpp', line 12393

VALUE
Image_rows(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, rows, int, &rm_image_data_type);
}

#sample(scale) ⇒ Magick::Image #sample(cols, rows) ⇒ Magick::Image

Scale an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.

Overloads:

  • #sample(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #sample(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width.

    • rows (Numeric) —

      The desired height.

Returns:

See Also:



12416
12417
12418
12419
12420
12421
 
# File 'ext/RMagick/rmimage.cpp', line 12416

VALUE
Image_sample(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return scale(False, argc, argv, self, GVL_FUNC(SampleImage));
}

#sample!(scale) ⇒ Magick::Image #sample!(cols, rows) ⇒ Magick::Image

Scale an image to the desired dimensions with pixel sampling. In-place form of #sample.

Overloads:

  • #sample!(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #sample!(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width.

    • rows (Numeric) —

      The desired height.

Returns:

See Also:



12440
12441
12442
12443
12444
12445
 
# File 'ext/RMagick/rmimage.cpp', line 12440

VALUE
Image_sample_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return scale(True, argc, argv, self, GVL_FUNC(SampleImage));
}

#scale(scale) ⇒ Magick::Image #scale(cols, rows) ⇒ Magick::Image

Change the size of an image to the given dimensions. Alias of #sample.

Overloads:

  • #scale(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #scale(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width.

    • rows (Numeric) —

      The desired height.

Returns:

See Also:



12464
12465
12466
12467
12468
12469
 
# File 'ext/RMagick/rmimage.cpp', line 12464

VALUE
Image_scale(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return scale(False, argc, argv, self, GVL_FUNC(ScaleImage));
}

#scale!(scale) ⇒ Magick::Image #scale!(cols, rows) ⇒ Magick::Image

Change the size of an image to the given dimensions. Alias of #sample!.

Overloads:

  • #scale!(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      You can use this argument instead of specifying the desired width and height. The percentage size change. For example, 1.25 makes the new image 125% of the size of the receiver. The scale factor 0.5 makes the new image 50% of the size of the receiver.

  • #scale!(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width.

    • rows (Numeric) —

      The desired height.

Returns:

See Also:



12488
12489
12490
12491
12492
12493
 
# File 'ext/RMagick/rmimage.cpp', line 12488

VALUE
Image_scale_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return scale(True, argc, argv, self, GVL_FUNC(ScaleImage));
}

#scene ⇒ Numeric

Return the scene number assigned to the image the last time the image was written to a multi-image image file.

Returns:

  • (Numeric) —

    the image scene



12583
12584
12585
12586
12587
 
# File 'ext/RMagick/rmimage.cpp', line 12583

VALUE
Image_scene(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, scene, ulong, &rm_image_data_type);
}

#segment(colorspace = Magick::RGBColorspace, cluster_threshold = 1.0, smoothing_threshold = 1.5, verbose = false) ⇒ Magick::Image

Segments an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique.

Returns a new image.

Parameters:

  • colorspace (Magick::ColorspaceType) (defaults to: Magick::RGBColorspace) —

    A ColorspaceType value. Empirical evidence suggests that distances in YUV or YIQ correspond to perceptual color differences more closely than do distances in RGB space. The image is then returned to RGB colorspace after color reduction.

  • cluster_threshold (Float) (defaults to: 1.0) —

    The number of pixels in each cluster must exceed the the cluster threshold to be considered valid.

  • smoothing_threshold (Float) (defaults to: 1.5) —

    The smoothing threshold eliminates noise in the second derivative of the histogram. As the value is increased, you can expect a smoother second derivative.

  • verbose (Boolean) (defaults to: false) —

    If true, segment prints detailed information about the identified classes.

Returns:



12792
12793
12794
12795
12796
12797
12798
12799
12800
12801
12802
12803
12804
12805
12806
12807
12808
12809
12810
12811
12812
12813
12814
12815
12816
12817
12818
12819
12820
12821
12822
12823
12824
12825
12826
12827
12828
12829
12830
12831
12832
12833
12834
12835
12836
12837
 
# File 'ext/RMagick/rmimage.cpp', line 12792

VALUE
Image_segment(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ColorspaceType colorspace   = RGBColorspace;    // These are the Magick++ defaults
    MagickBooleanType verbose   = MagickFalse;
    double cluster_threshold    = 1.0;
    double smoothing_threshold  = 1.5;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 4:
            verbose = (MagickBooleanType)RTEST(argv[3]);
        case 3:
            smoothing_threshold = NUM2DBL(argv[2]);
        case 2:
            cluster_threshold = NUM2DBL(argv[1]);
        case 1:
            VALUE_TO_ENUM(argv[0], colorspace, ColorspaceType);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SegmentImage) args = { new_image, colorspace, verbose, cluster_threshold, smoothing_threshold, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SegmentImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SegmentImage) args = { new_image, colorspace, verbose, cluster_threshold, smoothing_threshold };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SegmentImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#selective_blur_channel(radius, sigma, threshold, channel = Magick::AllChannels) ⇒ Magick::Image #selective_blur_channel(radius, sigma, threshold, *channels) ⇒ Magick::Image

Selectively blur pixels within a contrast threshold.

Overloads:

  • #selective_blur_channel(radius, sigma, threshold, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) —

      the radius value

    • sigma (Float) —

      the sigma value

    • threshold (Float, String) —

      Either a number between 0.0 and 1.0 or a string in the form “NN%”

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #selective_blur_channel(radius, sigma, threshold, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) —

      the radius value

    • sigma (Float) —

      the sigma value

    • threshold (Float, String) —

      Either a number between 0.0 and 1.0 or a string in the form “NN%”

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



12609
12610
12611
12612
12613
12614
12615
12616
12617
12618
12619
12620
12621
12622
12623
12624
12625
12626
12627
12628
12629
12630
12631
12632
12633
12634
12635
12636
12637
12638
12639
12640
12641
12642
12643
12644
12645
12646
12647
12648
12649
 
# File 'ext/RMagick/rmimage.cpp', line 12609

VALUE
Image_selective_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius, sigma, threshold;
    ExceptionInfo *exception;
    ChannelType channels;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 3)
    {
        raise_ChannelType_error(argv[argc-1]);
    }
    if (argc != 3)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 3 or more)", argc);
    }
    radius = NUM2DBL(argv[0]);
    sigma = NUM2DBL(argv[1]);

    // threshold is either a floating-point number or a string in the form "NN%".
    // Either way it's supposed to represent a percentage of the QuantumRange.
    threshold = rm_percentage(argv[2], 1.0) * QuantumRange;

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(SelectiveBlurImage) args = { image, radius, sigma, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SelectiveBlurImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(SelectiveBlurImageChannel) args = { image, channels, radius, sigma, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SelectiveBlurImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#separate(channel = Magick::AllChannels) ⇒ Magick::ImageList #separate(*channels) ⇒ Magick::ImageList

Constructs a grayscale image for each channel specified.

Overloads:

  • #separate(channel = Magick::AllChannels) ⇒ Magick::ImageList

    Parameters:

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #separate(*channels) ⇒ Magick::ImageList

    Parameters:

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



12703
12704
12705
12706
12707
12708
12709
12710
12711
12712
12713
12714
12715
12716
12717
12718
12719
12720
12721
12722
12723
12724
12725
12726
12727
12728
12729
12730
12731
12732
12733
12734
 
# File 'ext/RMagick/rmimage.cpp', line 12703

VALUE
Image_separate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_images;
    ChannelType channels = UndefinedChannel;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // All arguments are ChannelType enums
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(SeparateImages) args = { image, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SeparateImages), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_images);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(SeparateImages) args = { image, channels, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SeparateImages), &args);
#endif
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_imagelist_from_images(new_images);
}

#sepiatone(threshold = Magick::QuantumRange) ⇒ Magick::Image

Applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning.

Returns a new image.

Parameters:

  • threshold (Float) (defaults to: Magick::QuantumRange) —

    Threshold ranges from 0 to QuantumRange and is a measure of the extent of the sepia toning. A threshold of 80% is a good starting point for a reasonable tone.

Returns:



12746
12747
12748
12749
12750
12751
12752
12753
12754
12755
12756
12757
12758
12759
12760
12761
12762
12763
12764
12765
12766
12767
12768
12769
12770
12771
12772
12773
 
# File 'ext/RMagick/rmimage.cpp', line 12746

VALUE
Image_sepiatone(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double threshold = (double) QuantumRange;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 1:
            threshold = NUM2DBL(argv[0]);
            break;
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SepiaToneImage) args = { image, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SepiaToneImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#set_channel_depth(channel_arg, depth) ⇒ Object

Sets the depth of the image channel.

Parameters:

  • channel_arg (Magick::ChannelType) —

    the channel

  • depth (Numeric) —

    the depth

Returns:

  • self



12659
12660
12661
12662
12663
12664
12665
12666
12667
12668
12669
12670
12671
12672
12673
12674
12675
12676
12677
12678
12679
12680
12681
12682
12683
12684
12685
12686
12687
12688
12689
 
# File 'ext/RMagick/rmimage.cpp', line 12659

VALUE
Image_set_channel_depth(VALUE self, VALUE channel_arg, VALUE depth)
{
    Image *image;
    ChannelType channel;
    unsigned long channel_depth;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    VALUE_TO_ENUM(channel_arg, channel, ChannelType);
    channel_depth = NUM2ULONG(depth);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(image, channel);
    GVL_STRUCT_TYPE(SetImageDepth) args = { image, channel_depth, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageDepth), &args);
    END_CHANNEL_MASK(image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SetImageChannelDepth) args = { image, channel, channel_depth };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageChannelDepth), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#shade(shading = false, azimuth = 30.0, elevation = 30.0) ⇒ Magick::Image

Shine a distant light on an image to create a three-dimensional effect. You control the positioning of the light with azimuth and elevation; azimuth is measured in degrees off the x axis and elevation is measured in pixels above the Z axis.

Returns a new image.

Parameters:

  • shading (Boolean) (defaults to: false) —

    If true, shade shades the intensity of each pixel.

  • azimuth (Float) (defaults to: 30.0) —

    The light source direction. The azimuth is measured in degrees. 0 is at 9 o’clock. Increasing values move the light source counter-clockwise.

  • elevation (Float) (defaults to: 30.0) —

    The light source direction. The azimuth is measured in degrees. 0 is at 9 o’clock. Increasing values move the light source counter-clockwise.

Returns:



12943
12944
12945
12946
12947
12948
12949
12950
12951
12952
12953
12954
12955
12956
12957
12958
12959
12960
12961
12962
12963
12964
12965
12966
12967
12968
12969
12970
12971
12972
12973
12974
 
# File 'ext/RMagick/rmimage.cpp', line 12943

VALUE
Image_shade(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double azimuth = 30.0, elevation = 30.0;
    MagickBooleanType shading = MagickFalse;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 3:
            elevation = NUM2DBL(argv[2]);
        case 2:
            azimuth = NUM2DBL(argv[1]);
        case 1:
            shading = (MagickBooleanType)RTEST(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ShadeImage) args = { image, shading, azimuth, elevation, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ShadeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#Image ⇒ Magick::Image

Call ShadowImage. X- and y-offsets are the pixel offset. Alpha is either a number between 0 and 1 or a string “NN%”. Sigma is the std. dev. of the Gaussian, in pixels.

Returns a new image.

Parameters:

  • x_offset (Numeric) —

    The shadow x-offset

  • y_offset (Numeric) —

    The shadow y-offset

  • sigma (Float) —

    The standard deviation of the Gaussian operator used to produce the shadow. The higher the number, the “blurrier” the shadow, but the longer it takes to produce the shadow. Must be > 0.0.

  • alpha (String, Float) —

    The percent alpha of the shadow. The argument may be a floating-point numeric value or a string in the form “NN%”.

Returns:



12991
12992
12993
12994
12995
12996
12997
12998
12999
13000
13001
13002
13003
13004
13005
13006
13007
13008
13009
13010
13011
13012
13013
13014
13015
13016
13017
13018
13019
13020
13021
13022
13023
13024
13025
13026
13027
13028
13029
13030
13031
13032
13033
 
# File 'ext/RMagick/rmimage.cpp', line 12991

VALUE
Image_shadow(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double alpha = 100.0;
    double sigma = 4.0;
    long x_offset = 4L;
    long y_offset = 4L;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 4:
            alpha = rm_percentage(argv[3], 1.0);   // Clamp to 1.0 < x <= 100.0
            if (fabs(alpha) < 0.01)
            {
                rb_warning("shadow will be transparent - alpha %g very small", alpha);
            }
            alpha = FMIN(alpha, 1.0);
            alpha = FMAX(alpha, 0.01);
            alpha *= 100.0;
        case 3:
            sigma = NUM2DBL(argv[2]);
        case 2:
            y_offset = NUM2LONG(argv[1]);
        case 1:
            x_offset = NUM2LONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ShadowImage) args = { image, alpha, sigma, x_offset, y_offset, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ShadowImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Sharpen an image.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian operator.

  • sigma (Float) (defaults to: 1.0) —

    The sigma (standard deviation) of the Gaussian operator.

Returns:



13044
13045
13046
13047
13048
 
# File 'ext/RMagick/rmimage.cpp', line 13044

VALUE
Image_sharpen(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GVL_FUNC(SharpenImage));
}

#sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

Sharpen image on a channel.

Overloads:

  • #sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The sigma (standard deviation) of the Gaussian operator.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The sigma (standard deviation) of the Gaussian operator.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



13066
13067
13068
13069
13070
13071
13072
13073
13074
13075
13076
13077
13078
13079
13080
13081
13082
13083
13084
13085
13086
13087
13088
13089
13090
13091
13092
13093
13094
13095
13096
13097
13098
13099
13100
13101
13102
13103
13104
13105
13106
13107
13108
 
# File 'ext/RMagick/rmimage.cpp', line 13066

VALUE
Image_sharpen_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    ExceptionInfo *exception;
    double radius = 0.0, sigma = 1.0;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be 0, 1, or 2 remaining arguments.
    switch (argc)
    {
        case 2:
            sigma = NUM2DBL(argv[1]);
            /* Fall thru */
        case 1:
            radius = NUM2DBL(argv[0]);
            /* Fall thru */
        case 0:
            break;
        default:
            raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(SharpenImage) args = { image, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SharpenImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(SharpenImageChannel) args = { image, channels, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SharpenImageChannel), &args);
#endif

    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#shave(width, height) ⇒ Magick::Image

Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.

Parameters:

  • width (Numeric) —

    the width to leave

  • height (Numeric) —

    the hight to leave

Returns:

See Also:



13120
13121
13122
13123
13124
13125
 
# File 'ext/RMagick/rmimage.cpp', line 13120

VALUE
Image_shave(VALUE self, VALUE width, VALUE height)
{
    rm_check_destroyed(self);
    return xform_image(False, self, INT2FIX(0), INT2FIX(0), width, height, GVL_FUNC(ShaveImage));
}

#shave!(width, height) ⇒ Magick::Image

Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center. In-place form of #shave.

Parameters:

  • width (Numeric) —

    the width to leave

  • height (Numeric) —

    the hight to leave

Returns:

See Also:



13138
13139
13140
13141
13142
13143
 
# File 'ext/RMagick/rmimage.cpp', line 13138

VALUE
Image_shave_bang(VALUE self, VALUE width, VALUE height)
{
    rm_check_frozen(self);
    return xform_image(True, self, INT2FIX(0), INT2FIX(0), width, height, GVL_FUNC(ShaveImage));
}

#shear(x_shear, y_shear) ⇒ Magick::Image

Shearing slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x_shear is measured relative to the Y axis, and similarly, for Y direction shears y_shear is measured relative to the X axis. Empty triangles left over from shearing the image are filled with the background color.

Parameters:

  • x_shear (Float) —

    the x shear (in degrees)

  • y_shear (Float) —

    the y shear (in degrees)

Returns:



13158
13159
13160
13161
13162
13163
13164
13165
13166
13167
13168
13169
13170
13171
13172
13173
13174
13175
 
# File 'ext/RMagick/rmimage.cpp', line 13158

VALUE
Image_shear(VALUE self, VALUE x_shear, VALUE y_shear)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    double x = NUM2DBL(x_shear);
    double y = NUM2DBL(y_shear);

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(ShearImage) args = { image, x, y, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ShearImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, channel = Magick::AllChannels) ⇒ Magick::Image #sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, *channels) ⇒ Magick::Image

Adjusts the contrast of an image channel with a non-linear sigmoidal contrast algorithm. Increases the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows.

Overloads:

  • #sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • contrast (Float) (defaults to: 3.0) —

      indicates how much to increase the contrast (0 is none; 3 is typical; 20 is pushing it)

    • midpoint (Float) (defaults to: 50.0) —

      indicates where midtones fall in the resultant image (0 is white; 50% is middle-gray; 100% is black). Note that “50%” means “50% of the quantum range.” This argument is a number between 0 and QuantumRange. To specify “50%” use QuantumRange * 0.50.

    • sharpen (Boolean) (defaults to: false) —

      Set sharpen to true to increase the image contrast otherwise the contrast is reduced.

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, *channels) ⇒ Magick::Image

    Parameters:

    • contrast (Float) (defaults to: 3.0) —

      indicates how much to increase the contrast (0 is none; 3 is typical; 20 is pushing it)

    • midpoint (Float) (defaults to: 50.0) —

      indicates where midtones fall in the resultant image (0 is white; 50% is middle-gray; 100% is black). Note that “50%” means “50% of the quantum range.” This argument is a number between 0 and QuantumRange. To specify “50%” use QuantumRange * 0.50.

    • sharpen (Boolean) (defaults to: false) —

      Set sharpen to true to increase the image contrast otherwise the contrast is reduced.

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



13206
13207
13208
13209
13210
13211
13212
13213
13214
13215
13216
13217
13218
13219
13220
13221
13222
13223
13224
13225
13226
13227
13228
13229
13230
13231
13232
13233
13234
13235
13236
13237
13238
13239
13240
13241
13242
13243
13244
13245
13246
13247
13248
13249
13250
13251
13252
13253
 
# File 'ext/RMagick/rmimage.cpp', line 13206

VALUE
Image_sigmoidal_contrast_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType sharpen = MagickFalse;
    double contrast = 3.0;
    double midpoint = 50.0;
    ChannelType channels;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    switch (argc)
    {
        case 3:
            sharpen  = (MagickBooleanType) RTEST(argv[2]);
        case 2:
            midpoint = NUM2DBL(argv[1]);
        case 1:
            contrast = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            raise_ChannelType_error(argv[argc-1]);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    GVL_STRUCT_TYPE(SigmoidalContrastImage) args = { new_image, sharpen, contrast, midpoint, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SigmoidalContrastImage), &args);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SigmoidalContrastImageChannel) args = { new_image, channels, sharpen, contrast, midpoint };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SigmoidalContrastImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#signature ⇒ String?

Compute a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm.

Returns:

  • (String, nil) —

    the message digest



13262
13263
13264
13265
13266
13267
13268
13269
13270
13271
13272
13273
13274
13275
13276
13277
13278
13279
13280
13281
13282
13283
13284
13285
13286
13287
13288
13289
13290
 
# File 'ext/RMagick/rmimage.cpp', line 13262

VALUE
Image_signature(VALUE self)
{
    Image *image;
    const char *signature;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SignatureImage) args = { image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SignatureImage) args = { image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SignatureImage), &args);
    rm_check_image_exception(image, RetainOnError);
#endif
    signature = rm_get_property(image, "signature");
    if (!signature)
    {
        return Qnil;
    }
    return rb_str_new(signature, 64);
}

#sketch(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image

Simulates a pencil sketch. For best results start with a grayscale image.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation

  • angle (Float) (defaults to: 0.0) —

    The angle (in degrees)

Returns:

See Also:



13303
13304
13305
13306
13307
13308
 
# File 'ext/RMagick/rmimage.cpp', line 13303

VALUE
Image_sketch(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return motion_blur(argc, argv, self, GVL_FUNC(SketchImage));
}

#solarize(threshold = 50.0) ⇒ Object

Apply a special effect to the image, similar to the effect achieved in a photo darkroom by selectively exposing areas of photo sensitive paper to light. Threshold ranges from 0 to QuantumRange and is a measure of the extent of the solarization.

solarization.

Parameters:

  • threshold (Float) (defaults to: 50.0) —

    Ranges from 0 to QuantumRange and is a measure of the extent of the

Returns:

  • a new image



13321
13322
13323
13324
13325
13326
13327
13328
13329
13330
13331
13332
13333
13334
13335
13336
13337
13338
13339
13340
13341
13342
13343
13344
13345
13346
13347
13348
13349
13350
13351
13352
13353
13354
13355
13356
13357
13358
13359
13360
13361
 
# File 'ext/RMagick/rmimage.cpp', line 13321

VALUE
Image_solarize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double threshold = 50.0;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            threshold = NUM2DBL(argv[0]);
            if (threshold < 0.0 || threshold > QuantumRange)
            {
                rb_raise(rb_eArgError, "threshold out of range, must be >= 0.0 and < QuantumRange");
            }
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SolarizeImage) args = { new_image, threshold, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SolarizeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(SolarizeImage) args = { new_image, threshold };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SolarizeImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#sparse_color(method, x1, y1, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) ⇒ Magick::Image

Fills the image with the specified color or colors, starting at the x,y coordinates associated with the color and using the specified interpolation method.

Overloads:

  • #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) ⇒ Magick::Image

    Parameters:

    • method (Magick::SparseColorMethod) —

      the method

    • x1 (Float) —

      One or more x.

    • y1 (Float) —

      One or more y.

    • color (Magick::Pixel, String) —

      One or more color

    • channel (Magick::ChannelType) —

      one or more ChannelType arguments

Returns:



13493
13494
13495
13496
13497
13498
13499
13500
13501
13502
13503
13504
13505
13506
13507
13508
13509
13510
13511
13512
13513
13514
13515
13516
13517
13518
13519
13520
13521
13522
13523
13524
13525
13526
13527
13528
13529
13530
13531
13532
13533
13534
13535
13536
13537
13538
13539
13540
13541
13542
13543
13544
13545
13546
13547
13548
13549
13550
13551
13552
13553
13554
13555
13556
13557
13558
13559
13560
13561
13562
13563
13564
13565
13566
13567
13568
13569
13570
13571
13572
13573
13574
13575
13576
13577
13578
13579
13580
13581
13582
13583
13584
13585
13586
13587
13588
13589
13590
13591
13592
13593
 
# File 'ext/RMagick/rmimage.cpp', line 13493

VALUE
Image_sparse_color(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned long x, nargs, ncolors;
    SparseColorMethod method;
    int n, exp;
    double * volatile args;
    ChannelType channels;
    MagickPixel pp;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    n = argc;
    channels = extract_channels(&argc, argv);
    n -= argc;  // n is now the number of channel arguments

    // After the channel arguments have been removed, and not counting the first
    // (method) argument, the number of arguments should be a multiple of 3.
    if (argc < 4 || argc % 3 != 1)
    {
        exp = (argc + 2) / 3 * 3;
        exp = max(exp, 3);
        rb_raise(rb_eArgError, "wrong number of arguments (expected at least %d, got %d)", n+exp+1,  n+argc);
    }

    // Get the method from the argument list
    VALUE_TO_ENUM(argv[0], method, SparseColorMethod);
    argv += 1;
    argc -= 1;

    // A lot of the following code is based on SparseColorOption, in wand/mogrify.c
    ncolors = count_channels(image, &channels);
    nargs = (argc / 3) * (2 + ncolors);

    // Allocate args from Ruby's memory so that GC will collect it if one of
    // the type conversions below raises an exception.
    args = ALLOC_N(double, nargs);
    memset(args, 0, nargs * sizeof(double));

    x = 0;
    n = 0;
    while (n < argc)
    {
        VALUE elem1 = argv[n++];
        VALUE elem2 = argv[n++];
        if (rm_check_num2dbl(elem1) && rm_check_num2dbl(elem2))
        {
            args[x++] = NUM2DBL(elem1);
            args[x++] = NUM2DBL(elem2);
        }
        else
        {
            xfree((void *) args);
            rb_raise(rb_eTypeError, "type mismatch: %s and %s given", rb_class2name(CLASS_OF(elem1)), rb_class2name(CLASS_OF(elem2)));
        }
        Color_to_MagickPixel(NULL, &pp, argv[n++]);
        if (channels & RedChannel)
        {
            args[x++] = pp.red / QuantumRange;
        }
        if (channels & GreenChannel)
        {
            args[x++] = pp.green / QuantumRange;
        }
        if (channels & BlueChannel)
        {
            args[x++] = pp.blue / QuantumRange;
        }
        if (channels & IndexChannel)
        {
            args[x++] = pp.index / QuantumRange;
        }
        if (channels & OpacityChannel)
        {
#if defined(IMAGEMAGICK_7)
            args[x++] = pp.alpha / QuantumRange;
#else
            args[x++] = pp.opacity / QuantumRange;
#endif
        }
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(SparseColorImage) args_SparseColorImage = { image, method, nargs, args, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SparseColorImage), &args_SparseColorImage);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(SparseColorImage) args_SparseColorImage = { image, channels, method, nargs, args, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SparseColorImage), &args_SparseColorImage);
#endif
    xfree((void *) args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#splice(x, y, width, height, color = self.background_color) ⇒ Magick::Image

Splice a solid color into the part of the image specified by the x, y, width, and height arguments. If the color argument is specified it must be a color name or Pixel.

Returns a new image.

Parameters:

  • x (Numeric) —

    Describe the rectangle to be spliced.

  • y (Numeric) —

    Describe the rectangle to be spliced.

  • width (Numeric) —

    Describe the rectangle to be spliced.

  • height (Numeric) —

    Describe the rectangle to be spliced.

  • color (Magick::Pixel, String) (defaults to: self.background_color) —

    The color to be spliced.

Returns:

See Also:



13610
13611
13612
13613
13614
13615
13616
13617
13618
13619
13620
13621
13622
13623
13624
13625
13626
13627
13628
13629
13630
13631
13632
13633
13634
13635
13636
13637
13638
13639
13640
13641
13642
13643
13644
13645
13646
13647
13648
13649
13650
13651
13652
13653
 
# File 'ext/RMagick/rmimage.cpp', line 13610

VALUE
Image_splice(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelColor color, old_color;
    RectangleInfo rectangle;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 4:
            // use background color
            color = image->background_color;
            break;
        case 5:
            // Convert color argument to PixelColor
            Color_to_PixelColor(&color, argv[4]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 4 or 5)", argc);
            break;
    }

    rectangle.x      = NUM2LONG(argv[0]);
    rectangle.y      = NUM2LONG(argv[1]);
    rectangle.width  = NUM2ULONG(argv[2]);
    rectangle.height = NUM2ULONG(argv[3]);

    exception = AcquireExceptionInfo();

    // Swap in color for the duration of this call.
    old_color = image->background_color;
    image->background_color = color;
    GVL_STRUCT_TYPE(SpliceImage) args = { image, &rectangle, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SpliceImage), &args);
    image->background_color = old_color;

    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#spread(radius = 3.0) ⇒ Magick::Image

Randomly displace each pixel in a block defined by “radius”.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 3.0) —

    The radius

Returns:



13663
13664
13665
13666
13667
13668
13669
13670
13671
13672
13673
13674
13675
13676
13677
13678
13679
13680
13681
13682
13683
13684
13685
13686
13687
13688
13689
13690
13691
13692
13693
 
# File 'ext/RMagick/rmimage.cpp', line 13663

VALUE
Image_spread(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 3.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(SpreadImage) args = { image, image->interpolate, radius, exception };
#else
    GVL_STRUCT_TYPE(SpreadImage) args = { image, radius, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SpreadImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#start_loop ⇒ Boolean

Get the Boolean value that indicates the first image in an animation.

Returns:

  • (Boolean) —

    true or false



13701
13702
13703
13704
13705
 
# File 'ext/RMagick/rmimage.cpp', line 13701

VALUE
Image_start_loop(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, start_loop, boolean, &rm_image_data_type);
}

#start_loop=(val) ⇒ Boolean

Set the Boolean value that indicates the first image in an animation.

Parameters:

  • val (Boolean) —

    true or false

Returns:

  • (Boolean) —

    the given value



13713
13714
13715
13716
13717
 
# File 'ext/RMagick/rmimage.cpp', line 13713

VALUE
Image_start_loop_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, start_loop, boolean, &rm_image_data_type);
}

#stegano(watermark_image, offset) ⇒ Magick::Image

Hides a digital watermark in the receiver. You can retrieve the watermark by reading the file with the stegano: prefix, thereby proving the authenticity of the file.

The watermarked image must be saved in a lossless RGB format such as MIFF, or PNG. You cannot save a watermarked image in a lossy format such as JPEG or a pseudocolor format such as GIF. Once written, the file must not be modified or processed in any way.

Parameters:

  • watermark_image (Magick::Image, Magick::ImageList) —

    Either an imagelist or an image

  • offset (Numeric) —

    the start position within the image to hide the watermark.

Returns:



13732
13733
13734
13735
13736
13737
13738
13739
13740
13741
13742
13743
13744
13745
13746
13747
13748
13749
13750
13751
13752
13753
13754
13755
13756
13757
 
# File 'ext/RMagick/rmimage.cpp', line 13732

VALUE
Image_stegano(VALUE self, VALUE watermark_image, VALUE offset)
{
    Image *image, *new_image;
    VALUE wm_image;
    Image *watermark;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    wm_image = rm_cur_image(watermark_image);
    watermark = rm_check_destroyed(wm_image);

    image->offset = NUM2LONG(offset);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SteganoImage) args = { image, watermark, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SteganoImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(wm_image);

    return rm_image_new(new_image);
}

#stereo(offset_image_arg) ⇒ Magick::Image

Combine two images and produces a single image that is the composite of a left and right image of a stereo pair. Special red-green stereo glasses are required to view this effect.

Parameters:

Returns:



13767
13768
13769
13770
13771
13772
13773
13774
13775
13776
13777
13778
13779
13780
13781
13782
13783
13784
13785
13786
13787
13788
13789
13790
 
# File 'ext/RMagick/rmimage.cpp', line 13767

VALUE
Image_stereo(VALUE self, VALUE offset_image_arg)
{
    Image *image, *new_image;
    VALUE offset_image;
    Image *offset;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    offset_image = rm_cur_image(offset_image_arg);
    offset = rm_check_destroyed(offset_image);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(StereoImage) args = { image, offset, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(StereoImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(offset_image);

    return rm_image_new(new_image);
}

#store_pixels(x_arg, y_arg, cols_arg, rows_arg, new_pixels) ⇒ Magick::Image

Replace the pixels in the specified rectangle with the pixels in the pixels array.

  • This is the complement of get_pixels. The array object returned by get_pixels is suitable for use as the “new_pixels” argument.

Parameters:

  • x_arg (Numeric) —

    x position of start of region

  • y_arg (Numeric) —

    y position of start of region

  • cols_arg (Numeric) —

    width of region

  • rows_arg (Numeric) —

    height of region

  • new_pixels (Array<Magick::Pixel>) —

    the replacing pixels

Returns:



13890
13891
13892
13893
13894
13895
13896
13897
13898
13899
13900
13901
13902
13903
13904
13905
13906
13907
13908
13909
13910
13911
13912
13913
13914
13915
13916
13917
13918
13919
13920
13921
13922
13923
13924
13925
13926
13927
13928
13929
13930
13931
13932
13933
13934
13935
13936
13937
13938
13939
13940
13941
13942
13943
13944
13945
13946
13947
13948
13949
13950
13951
13952
13953
13954
13955
13956
13957
13958
13959
13960
13961
13962
13963
13964
13965
13966
13967
13968
13969
13970
13971
13972
13973
13974
13975
13976
13977
13978
13979
13980
13981
13982
13983
13984
13985
13986
13987
13988
13989
13990
13991
13992
13993
13994
13995
13996
13997
13998
13999
 
# File 'ext/RMagick/rmimage.cpp', line 13890

VALUE
Image_store_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg,
                   VALUE rows_arg, VALUE new_pixels)
{
    Image *image;
    Pixel *pixel;
    VALUE new_pixel;
    long n, size;
    long x, y;
    unsigned long cols, rows;
    MagickBooleanType okay;
    ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
    Quantum *pixels;
#else
    PixelPacket *pixels;
#endif

    image = rm_check_destroyed(self);

    x = NUM2LONG(x_arg);
    y = NUM2LONG(y_arg);
    cols = NUM2ULONG(cols_arg);
    rows = NUM2ULONG(rows_arg);
    if (x < 0 || y < 0 || x+cols > image->columns || y+rows > image->rows)
    {
        rb_raise(rb_eRangeError, "geometry (%lux%lu%+ld%+ld) exceeds image bounds",
                 cols, rows, x, y);
    }

    size = (long)(cols * rows);
    new_pixels = rb_Array(new_pixels);
    rm_check_ary_len(new_pixels, size);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, DirectClass, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    CHECK_EXCEPTION();
    if (!okay)
    {
        DestroyExceptionInfo(exception);
        rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
    }
#else
    GVL_STRUCT_TYPE(SetImageStorageClass) args = { image, DirectClass };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(image, RetainOnError);
    if (!okay)
    {
        rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
    }
    exception = AcquireExceptionInfo();
#endif

    // Get a pointer to the pixels. Replace the values with the PixelPackets
    // from the pixels argument.
    {
        GVL_STRUCT_TYPE(GetAuthenticPixels) args = { image, x, y, cols, rows, exception };
        void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetAuthenticPixels), &args);
        pixels = reinterpret_cast<decltype(pixels)>(ret);
        CHECK_EXCEPTION();

        if (pixels)
        {
#if defined(IMAGEMAGICK_6)
            IndexPacket *indexes = GetAuthenticIndexQueue(image);
#endif
            for (n = 0; n < size; n++)
            {
                new_pixel = rb_ary_entry(new_pixels, n);
                if (CLASS_OF(new_pixel) != Class_Pixel)
                {
                    DestroyExceptionInfo(exception);
                    rb_raise(rb_eTypeError, "Item in array should be a Pixel.");
                }
                TypedData_Get_Struct(new_pixel, Pixel, &rm_pixel_data_type, pixel);
#if defined(IMAGEMAGICK_7)
                SetPixelRed(image,   pixel->red,   pixels);
                SetPixelGreen(image, pixel->green, pixels);
                SetPixelBlue(image,  pixel->blue,  pixels);
                SetPixelAlpha(image, pixel->alpha, pixels);
                SetPixelBlack(image, pixel->black, pixels);
                pixels += GetPixelChannels(image);
#else
                SetPixelRed(pixels, pixel->red);
                SetPixelGreen(pixels, pixel->green);
                SetPixelBlue(pixels, pixel->blue);
                SetPixelOpacity(pixels, pixel->opacity);
                if (indexes)
                {
                    SetPixelIndex(indexes + n, pixel->black);
                }
                pixels++;
#endif
            }
            GVL_STRUCT_TYPE(SyncAuthenticPixels) args = { image, exception };
            CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SyncAuthenticPixels), &args);
            CHECK_EXCEPTION();
        }

        DestroyExceptionInfo(exception);
    }

    RB_GC_GUARD(new_pixel);

    return self;
}

#strip! ⇒ Magick::Image

Strips an image of all profiles and comments.

Returns:



14007
14008
14009
14010
14011
14012
14013
14014
14015
14016
14017
14018
14019
14020
14021
14022
14023
14024
14025
14026
 
# File 'ext/RMagick/rmimage.cpp', line 14007

VALUE
Image_strip_bang(VALUE self)
{
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    Image *image = rm_check_frozen(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    StripImage(image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    StripImage(image);
    rm_check_image_exception(image, RetainOnError);
#endif
    return self;
}

#swirl(degrees_obj) ⇒ Magick::Image

Swirl the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved. You get a more dramatic effect as the degrees move from 1 to 360.

Parameters:

  • degrees_obj (Float) —

    the degrees

Returns:



14037
14038
14039
14040
14041
14042
14043
14044
14045
14046
14047
14048
14049
14050
14051
14052
14053
14054
14055
14056
14057
14058
 
# File 'ext/RMagick/rmimage.cpp', line 14037

VALUE
Image_swirl(VALUE self, VALUE degrees_obj)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    double degrees = NUM2DBL(degrees_obj);

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(SwirlImage) args = { image, degrees, image->interpolate, exception };
#else
    GVL_STRUCT_TYPE(SwirlImage) args = { image, degrees, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SwirlImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#texture_fill_to_border(x, y, texture) ⇒ Object

Replace neighboring pixels to border color with texture pixels



1017
1018
1019
 
# File 'lib/rmagick_internal.rb', line 1017

def texture_fill_to_border(x, y, texture)
  texture_flood_fill(border_color, texture, x, y, FillToBorderMethod)
end

#texture_flood_fill(color_obj, texture_obj, x_obj, y_obj, method_obj) ⇒ Magick::Image

Emulates Magick++‘s floodFillTexture.

If the FloodfillMethod method is specified, flood-fills texture across pixels starting at the target pixel and matching the specified color.

If the FillToBorderMethod method is specified, flood-fills ‘texture across pixels starting at the target pixel and stopping at pixels matching the specified color.’

Parameters:

  • color_obj (Magick::Pixel, String) —

    the color

  • texture_obj (Magick::Image, Magick::ImageList) —

    the texture to fill

  • x_obj (Numeric) —

    the x position

  • y_obj (Numeric) —

    the y position

  • method_obj (Magick::PaintMethod) —

    the method to call (FloodfillMethod or FillToBorderMethod)

Returns:



14077
14078
14079
14080
14081
14082
14083
14084
14085
14086
14087
14088
14089
14090
14091
14092
14093
14094
14095
14096
14097
14098
14099
14100
14101
14102
14103
14104
14105
14106
14107
14108
14109
14110
14111
14112
14113
14114
14115
14116
14117
14118
14119
14120
14121
14122
14123
14124
14125
14126
14127
14128
14129
14130
14131
14132
14133
14134
14135
14136
14137
14138
14139
14140
14141
14142
14143
14144
14145
14146
14147
14148
14149
14150
14151
14152
14153
14154
14155
14156
14157
14158
14159
14160
 
# File 'ext/RMagick/rmimage.cpp', line 14077

VALUE
Image_texture_flood_fill(VALUE self, VALUE color_obj, VALUE texture_obj,
                         VALUE x_obj, VALUE y_obj, VALUE method_obj)
{
    Image *image, *new_image;
    Image *texture_image;
    PixelColor color;
    VALUE texture;
    DrawInfo *draw_info;
    long x, y;
    PaintMethod method;
    MagickPixel color_mpp;
    MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    Color_to_PixelColor(&color, color_obj);
    texture = rm_cur_image(texture_obj);
    texture_image = rm_check_destroyed(texture);

    x = NUM2LONG(x_obj);
    y = NUM2LONG(y_obj);

    if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
    {
        rb_raise(rb_eArgError, "target out of range. %ldx%ld given, image is %" RMIuSIZE "x%" RMIuSIZE "",
                 x, y, image->columns, image->rows);
    }

    VALUE_TO_ENUM(method_obj, method, PaintMethod);
    if (method != FillToBorderMethod && method != FloodfillMethod)
    {
        rb_raise(rb_eArgError, "paint method must be FloodfillMethod or "
                 "FillToBorderMethod (%d given)", (int)method);
    }

    draw_info = CloneDrawInfo(NULL, NULL);
    if (!draw_info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    draw_info->fill_pattern = rm_clone_image(texture_image);
    new_image = rm_clone_image(image);


    rm_init_magickpixel(new_image, &color_mpp);
    if (method == FillToBorderMethod)
    {
        invert = MagickTrue;
        color_mpp.red   = (MagickRealType) image->border_color.red;
        color_mpp.green = (MagickRealType) image->border_color.green;
        color_mpp.blue  = (MagickRealType) image->border_color.blue;
    }
    else
    {
        invert = MagickFalse;
        color_mpp.red   = (MagickRealType) color.red;
        color_mpp.green = (MagickRealType) color.green;
        color_mpp.blue  = (MagickRealType) color.blue;
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, draw_info, &color_mpp, x, y, invert, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, DefaultChannels, draw_info, &color_mpp, x, y, invert };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);

    DestroyDrawInfo(draw_info);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    RB_GC_GUARD(texture);

    return rm_image_new(new_image);
}

#texture_floodfill(x, y, texture) ⇒ Object

Replace matching neighboring pixels with texture pixels



1011
1012
1013
1014
 
# File 'lib/rmagick_internal.rb', line 1011

def texture_floodfill(x, y, texture)
  target = pixel_color(x, y)
  texture_flood_fill(target, texture, x, y, FloodfillMethod)
end

#threshold(threshold_obj) ⇒ Magick::Image

Change the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.

Parameters:

  • threshold_obj (Float) —

    the threshold

Returns:



14170
14171
14172
14173
14174
14175
14176
14177
14178
14179
14180
14181
14182
14183
14184
14185
14186
14187
14188
14189
14190
14191
14192
14193
14194
14195
 
# File 'ext/RMagick/rmimage.cpp', line 14170

VALUE
Image_threshold(VALUE self, VALUE threshold_obj)
{
    Image *image, *new_image;
    double threshold = NUM2DBL(threshold_obj);
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(BilevelImage) args = { new_image, threshold, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BilevelImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(BilevelImageChannel) args = { new_image, DefaultChannels, threshold };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BilevelImageChannel), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#thumbnail(scale) ⇒ Magick::Image #thumbnail(cols, rows) ⇒ Magick::Image

The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original.

Overloads:

  • #thumbnail(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      The desired size represented as a floating-point number. For example, to make a thumbnail that is 9.5% of the size of the original image, use 0.095.

  • #thumbnail(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width in pixels.

Returns:

See Also:



14365
14366
14367
14368
14369
14370
 
# File 'ext/RMagick/rmimage.cpp', line 14365

VALUE
Image_thumbnail(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return thumbnail(False, argc, argv, self);
}

#thumbnail!(scale) ⇒ Magick::Image #thumbnail!(cols, rows) ⇒ Magick::Image

The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original. In-place form of #thumbnail.

Overloads:

  • #thumbnail!(scale) ⇒ Magick::Image

    Parameters:

    • scale (Float) —

      The desired size represented as a floating-point number. For example, to make a thumbnail that is 9.5% of the size of the original image, use 0.095.

  • #thumbnail!(cols, rows) ⇒ Magick::Image

    Parameters:

    • cols (Numeric) —

      The desired width in pixels.

Returns:

See Also:



14387
14388
14389
14390
14391
14392
 
# File 'ext/RMagick/rmimage.cpp', line 14387

VALUE
Image_thumbnail_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return thumbnail(True, argc, argv, self);
}

#ticks_per_second ⇒ Numeric

Get the number of ticks per second. This attribute is used in conjunction with the delay attribute to establish the amount of time that must elapse between frames in an animation.The default is 100.

Returns:

  • (Numeric) —

    ticks per second



14402
14403
14404
14405
14406
14407
 
# File 'ext/RMagick/rmimage.cpp', line 14402

VALUE
Image_ticks_per_second(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return INT2FIX(image->ticks_per_second);
}

#ticks_per_second=(tps) ⇒ Numeric

Set the number of ticks per second. This attribute is used in conjunction with the delay attribute to establish the amount of time that must elapse between frames in an animation.The default is 100.

Parameters:

  • tps (Numeric) —

    ticks per second

Returns:

  • (Numeric) —

    the given value



14418
14419
14420
14421
14422
14423
14424
 
# File 'ext/RMagick/rmimage.cpp', line 14418

VALUE
Image_ticks_per_second_eq(VALUE self, VALUE tps)
{
    Image *image = rm_check_frozen(self);
    image->ticks_per_second = NUM2ULONG(tps);
    return tps;
}

#tint(tint, red_alpha, green_alpha = red_alpha, blue_alpha = red_alpha, alpha_alpha = 1.0) ⇒ Object

Applies a color vector to each pixel in the image.

  • Alpha values are percentages: 0.10 -> 10%.

Returns a new image.

Parameters:

  • tint (Magick::Pixel, String) —

    the color name

  • red_alpha (Float) —

    the red value

  • green_alpha (Float) (defaults to: red_alpha) —

    the green value

  • blue_alpha (Float) (defaults to: red_alpha) —

    the blue value

  • alpha_alpha (Float) (defaults to: 1.0) —

    the alpha value

Returns:

  • a new image



14440
14441
14442
14443
14444
14445
14446
14447
14448
14449
14450
14451
14452
14453
14454
14455
14456
14457
14458
14459
14460
14461
14462
14463
14464
14465
14466
14467
14468
14469
14470
14471
14472
14473
14474
14475
14476
14477
14478
14479
14480
14481
14482
14483
14484
14485
14486
14487
14488
14489
14490
14491
14492
14493
14494
14495
14496
14497
14498
14499
14500
14501
14502
 
# File 'ext/RMagick/rmimage.cpp', line 14440

VALUE
Image_tint(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelColor tint;
    double red_pct_opaque, green_pct_opaque, blue_pct_opaque;
    double alpha_pct_opaque = 1.0;
    char alpha[50];
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = blue_pct_opaque = red_pct_opaque;
            break;
        case 3:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = NUM2DBL(argv[2]);
            blue_pct_opaque  = red_pct_opaque;
            break;
        case 4:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            break;
        case 5:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            alpha_pct_opaque   = NUM2DBL(argv[4]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 5)", argc);
            break;
    }

    if (red_pct_opaque < 0.0 || green_pct_opaque < 0.0
        || blue_pct_opaque < 0.0 || alpha_pct_opaque < 0.0)
    {
        rb_raise(rb_eArgError, "alpha percentages must be non-negative.");
    }

    snprintf(alpha, sizeof(alpha),
            "%g,%g,%g,%g", red_pct_opaque*100.0, green_pct_opaque*100.0,
            blue_pct_opaque*100.0, alpha_pct_opaque*100.0);

    Color_to_PixelColor(&tint, argv[0]);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(TintImage) args = { image, alpha, &tint, exception };
#else
    GVL_STRUCT_TYPE(TintImage) args = { image, alpha, tint, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TintImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#to_blob ⇒ String

Return a “blob” (a String) from the image.

  • The magick member of the Image structure determines the format of the returned blob (GIG, JPEG, PNG, etc.)

Returns:

  • (String) —

    the blob

See Also:



14514
14515
14516
14517
14518
14519
14520
14521
14522
14523
14524
14525
14526
14527
14528
14529
14530
14531
14532
14533
14534
14535
14536
14537
14538
14539
14540
14541
14542
14543
14544
14545
14546
14547
14548
14549
14550
14551
14552
14553
14554
14555
14556
14557
14558
14559
14560
14561
14562
14563
14564
14565
14566
14567
14568
14569
14570
14571
14572
14573
14574
14575
14576
14577
14578
14579
14580
14581
14582
14583
14584
14585
14586
14587
14588
14589
14590
14591
14592
14593
14594
14595
14596
14597
14598
 
# File 'ext/RMagick/rmimage.cpp', line 14514

VALUE
Image_to_blob(VALUE self)
{
    Image *image;
    Info *info;
    const MagickInfo *magick_info;
    VALUE info_obj;
    VALUE blob_str;
    void *blob = NULL;
    size_t length = 2048;       // Do what Magick++ does
    ExceptionInfo *exception;

    // The user can specify the depth (8 or 16, if the format supports
    // both) and the image format by setting the depth and format
    // values in the info parm block.
    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();

    // Copy the depth and magick fields to the Image
    if (info->depth != 0)
    {
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(SetImageDepth) args = { image, info->depth, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageDepth), &args);
        CHECK_EXCEPTION();
#else
        GVL_STRUCT_TYPE(SetImageDepth) args = { image, info->depth };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageDepth), &args);
        rm_check_image_exception(image, RetainOnError);
#endif
    }

    if (*info->magick)
    {
        SetImageInfo(info, MagickTrue, exception);
        CHECK_EXCEPTION();

        if (*info->magick == '\0')
        {
            return Qnil;
        }
        strlcpy(image->magick, info->magick, sizeof(image->magick));
    }

    // Fix #2844 - libjpeg exits when image is 0x0
    magick_info = GetMagickInfo(image->magick, exception);
    CHECK_EXCEPTION();

    if (magick_info)
    {
        if (  (!rm_strcasecmp(magick_info->name, "JPEG")
               || !rm_strcasecmp(magick_info->name, "JPG"))
              && (image->rows == 0 || image->columns == 0))
        {
            rb_raise(rb_eRuntimeError, "Can't convert %" RMIuSIZE "x%" RMIuSIZE " %.4s image to a blob",
                     image->columns, image->rows, magick_info->name);
        }
    }

    rm_sync_image_options(image, info);

    GVL_STRUCT_TYPE(ImageToBlob) args = { info, image, &length, exception };
    blob = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImageToBlob), &args);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    if (length == 0 || !blob)
    {
        return Qnil;
    }

    blob_str = rb_str_new((const char *)blob, length);

    magick_free((void*)blob);

    RB_GC_GUARD(info_obj);
    RB_GC_GUARD(blob_str);

    return blob_str;
}

#to_color(pixel_arg) ⇒ String

Return a color name for the color intensity specified by the Magick::Pixel argument.

Parameters:

Returns:

  • (String) —

    the color name



14607
14608
14609
14610
14611
14612
14613
14614
14615
14616
14617
14618
14619
14620
14621
14622
14623
14624
14625
14626
14627
14628
14629
14630
14631
14632
14633
14634
14635
 
# File 'ext/RMagick/rmimage.cpp', line 14607

VALUE
Image_to_color(VALUE self, VALUE pixel_arg)
{
    Image *image;
    PixelColor pixel;
    ExceptionInfo *exception;
    char name[MaxTextExtent];

    image = rm_check_destroyed(self);
    Color_to_PixelColor(&pixel, pixel_arg);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    pixel.depth = MAGICKCORE_QUANTUM_DEPTH;
    pixel.colorspace = image->colorspace;
#endif

    // QueryColorname returns False if the color represented by the PixelPacket
    // doesn't have a "real" name, just a sequence of hex digits. We don't care
    // about that.

    QueryColorname(image, &pixel, AllCompliance, name, exception);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return rb_str_new2(name);

}

#total_colors ⇒ Numeric

Alias for #number_colors.

Returns:

  • (Numeric) —

    number of unique colors

See Also:



14644
14645
14646
14647
14648
 
# File 'ext/RMagick/rmimage.cpp', line 14644

VALUE
Image_total_colors(VALUE self)
{
    return Image_number_colors(self);
}

#total_ink_density ⇒ Float

Return the total ink density for a CMYK image.

Returns:

  • (Float) —

    the total ink density



14656
14657
14658
14659
14660
14661
14662
14663
14664
14665
14666
14667
14668
14669
14670
14671
14672
14673
14674
14675
14676
14677
14678
 
# File 'ext/RMagick/rmimage.cpp', line 14656

VALUE
Image_total_ink_density(VALUE self)
{
    Image *image;
    double density;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    density = GetImageTotalInkDensity(image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    density = GetImageTotalInkDensity(image);
    rm_check_image_exception(image, RetainOnError);
#endif

    return rb_float_new(density);
}

#transparent(color, alpha: Magick::TransparentAlpha) ⇒ Magick::Image

Changes the opacity value of all the pixels that match color to the value specified by opacity. By default the pixel must match exactly, but you can specify a tolerance level by setting the fuzz attribute on the image.

  • Default alpha is Magick::TransparentAlpha.

  • Can use Magick::OpaqueAlpha or Magick::TransparentAlpha, or any value >= 0 && <= QuantumRange.

  • Use Image#fuzz= to define the tolerance level.

Returns a new image.

Parameters:

  • color (Magick::Pixel, String) —

    The color

  • alpha (defaults to: Magick::TransparentAlpha) —

    alpha [Numeric] the alpha

Returns:



14696
14697
14698
14699
14700
14701
14702
14703
14704
14705
14706
14707
14708
14709
14710
14711
14712
14713
14714
14715
14716
14717
14718
14719
14720
14721
14722
14723
14724
14725
14726
14727
14728
14729
14730
14731
14732
14733
14734
14735
14736
14737
14738
14739
14740
14741
14742
14743
14744
14745
 
# File 'ext/RMagick/rmimage.cpp', line 14696

VALUE
Image_transparent(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickPixel color;
    Quantum alpha = TransparentAlpha;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif


    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            alpha = get_named_alpha_value(argv[1]);
        case 1:
            Color_to_MagickPixel(image, &color, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(TransparentPaintImage) args = { new_image, &color, alpha, MagickFalse, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(TransparentPaintImage) args = { new_image, &color, (Quantum)(QuantumRange - alpha), MagickFalse };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(new_image, DestroyOnError);
#endif
    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_magick_error("TransparentPaintImage failed with no explanation");
    }

    return rm_image_new(new_image);
}

#transparent_chroma(low, high, invert, alpha: Magick::TransparentAlpha) ⇒ Magick::Image

Changes the opacity value associated with any pixel between low and high to the value defined by opacity.

As there is one fuzz value for the all the channels, the transparent method is not suitable for the operations like chroma, where the tolerance for similarity of two color components (RGB) can be different, Thus we define this method take two target pixels (one low and one high) and all the pixels of an image which are lying between these two pixels are made transparent.

Returns a new image.

Parameters:

  • low (Magick::Pixel, String) —

    The low ends of the pixel range

  • high (Magick::Pixel, String) —

    The high ends of the pixel range

  • invert (Boolean) —

    If true, all pixels outside the range are set to opacity.

  • alpha (Numeric) (defaults to: Magick::TransparentAlpha) —

    The desired alpha.

Returns:



14764
14765
14766
14767
14768
14769
14770
14771
14772
14773
14774
14775
14776
14777
14778
14779
14780
14781
14782
14783
14784
14785
14786
14787
14788
14789
14790
14791
14792
14793
14794
14795
14796
14797
14798
14799
14800
14801
14802
14803
14804
14805
14806
14807
14808
14809
14810
14811
14812
14813
14814
14815
14816
14817
14818
14819
14820
14821
14822
14823
 
# File 'ext/RMagick/rmimage.cpp', line 14764

VALUE
Image_transparent_chroma(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    Quantum alpha = TransparentAlpha;
    MagickPixel low, high;
    MagickBooleanType invert = MagickFalse;
    MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 4:
            if (TYPE(argv[argc - 1]) == T_HASH)
            {
                invert = (MagickBooleanType)RTEST(argv[3]);
            }
            else
            {
                invert = (MagickBooleanType)RTEST(argv[2]);
            }
        case 3:
            alpha = get_named_alpha_value(argv[argc - 1]);
        case 2:
            Color_to_MagickPixel(image, &high, argv[1]);
            Color_to_MagickPixel(image, &low, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2, 3 or 4)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(TransparentPaintImageChroma) args = { new_image, &low, &high, alpha, invert, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImageChroma), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(TransparentPaintImageChroma) args = { new_image, &low, &high, (Quantum)(QuantumRange - alpha), invert };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TransparentPaintImageChroma), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_image_exception(new_image, DestroyOnError);
#endif
    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_magick_error("TransparentPaintImageChroma failed with no explanation");
    }

    return rm_image_new(new_image);
}

#transparent_color ⇒ String

Return the name of the transparent color as a String.

Returns:

  • (String) —

    the name of the transparent color



14831
14832
14833
14834
14835
14836
 
# File 'ext/RMagick/rmimage.cpp', line 14831

VALUE
Image_transparent_color(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return rm_pixelcolor_to_color_name(image, &image->transparent_color);
}

#transparent_color=(color) ⇒ Magick::Pixel, String

Set the the transparent color to the specified color spec.

Parameters:

Returns:



14845
14846
14847
14848
14849
14850
14851
 
# File 'ext/RMagick/rmimage.cpp', line 14845

VALUE
Image_transparent_color_eq(VALUE self, VALUE color)
{
    Image *image = rm_check_frozen(self);
    Color_to_PixelColor(&image->transparent_color, color);
    return color;
}

#transpose ⇒ Magick::Image

Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.

Returns:

See Also:



14861
14862
14863
14864
14865
14866
 
# File 'ext/RMagick/rmimage.cpp', line 14861

VALUE
Image_transpose(VALUE self)
{
    rm_check_destroyed(self);
    return crisscross(False, self, GVL_FUNC(TransposeImage));
}

#transpose! ⇒ Magick::Image

Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees. In-place form of #transpose.

Returns:

See Also:



14877
14878
14879
14880
14881
14882
 
# File 'ext/RMagick/rmimage.cpp', line 14877

VALUE
Image_transpose_bang(VALUE self)
{
    rm_check_frozen(self);
    return crisscross(True, self, GVL_FUNC(TransposeImage));
}

#transverse ⇒ Magick::Image

Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees

Returns:

See Also:



14892
14893
14894
14895
14896
14897
 
# File 'ext/RMagick/rmimage.cpp', line 14892

VALUE
Image_transverse(VALUE self)
{
    rm_check_destroyed(self);
    return crisscross(False, self, GVL_FUNC(TransverseImage));
}

#transverse! ⇒ Magick::Image

Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees In-place form of #transverse.

Returns:

See Also:



14907
14908
14909
14910
14911
14912
 
# File 'ext/RMagick/rmimage.cpp', line 14907

VALUE
Image_transverse_bang(VALUE self)
{
    rm_check_frozen(self);
    return crisscross(True, self, GVL_FUNC(TransverseImage));
}

#trim(reset = false) ⇒ Magick::Image

Removes the edges that are exactly the same color as the corner pixels. Use the fuzz attribute to make trim remove edges that are nearly the same color as the corner pixels.

Returns a new image.

Parameters:

  • reset (Boolean) (defaults to: false) —

    The trim method retains the offset information in the cropped image. This may cause the image to appear to be surrounded by blank or black space when viewed with an external viewer. This only occurs when the image is saved in a format (such as GIF) that saves offset information. To reset the offset data, use true as the argument to trim.

Returns:

See Also:



14987
14988
14989
14990
14991
14992
 
# File 'ext/RMagick/rmimage.cpp', line 14987

VALUE
Image_trim(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return trimmer(False, argc, argv, self);
}

#trim!(reset = false) ⇒ Magick::Image

Removes the edges that are exactly the same color as the corner pixels. Use the fuzz attribute to make trim remove edges that are nearly the same color as the corner pixels.

Returns a new image.

Parameters:

  • reset (Boolean) (defaults to: false) —

    The trim method retains the offset information in the cropped image. This may cause the image to appear to be surrounded by blank or black space when viewed with an external viewer. This only occurs when the image is saved in a format (such as GIF) that saves offset information. To reset the offset data, use true as the argument to trim.

Returns:

See Also:



15007
15008
15009
15010
15011
15012
 
# File 'ext/RMagick/rmimage.cpp', line 15007

VALUE
Image_trim_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return trimmer(True, argc, argv, self);
}

#undefine(artifact) ⇒ Magick::Image

Removes an artifact from the image and returns its value.

Parameters:

  • artifact (String) —

    the artifact

Returns:

See Also:



15106
15107
15108
15109
15110
15111
15112
15113
15114
15115
15116
 
# File 'ext/RMagick/rmimage.cpp', line 15106

VALUE
Image_undefine(VALUE self, VALUE artifact)
{
    Image *image;
    char *key;

    image = rm_check_frozen(self);
    key = StringValueCStr(artifact);
    DeleteImageArtifact(image, key);
    return self;
}

#unique_colors ⇒ Magick::Image

Constructs a new image with one pixel for each unique color in the image. The new image has 1 row. The row has 1 column for each unique pixel in the image.

Returns:



15125
15126
15127
15128
15129
15130
15131
15132
15133
15134
15135
15136
15137
15138
15139
15140
 
# File 'ext/RMagick/rmimage.cpp', line 15125

VALUE
Image_unique_colors(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(UniqueImageColors) args = { image, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(UniqueImageColors), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#units ⇒ Magick::ResolutionType

Get the units of image resolution.

Returns:

  • (Magick::ResolutionType) —

    the resolution type



15148
15149
15150
15151
15152
15153
 
# File 'ext/RMagick/rmimage.cpp', line 15148

VALUE
Image_units(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return ResolutionType_find(image->units);
}

#units=(restype) ⇒ Magick::ResolutionType

Set the units of image resolution.

Parameters:

  • restype (Magick::ResolutionType) —

    the resolution type

Returns:

  • (Magick::ResolutionType) —

    the given value



15162
15163
15164
15165
15166
15167
15168
15169
15170
15171
15172
15173
15174
15175
15176
15177
15178
15179
15180
15181
15182
15183
15184
15185
15186
15187
15188
15189
15190
15191
15192
15193
15194
15195
15196
15197
15198
15199
15200
15201
15202
15203
15204
15205
15206
15207
15208
15209
15210
15211
15212
15213
15214
15215
15216
 
# File 'ext/RMagick/rmimage.cpp', line 15162

VALUE
Image_units_eq(VALUE self, VALUE restype)
{
    ResolutionType units;
    Image *image = rm_check_frozen(self);

    VALUE_TO_ENUM(restype, units, ResolutionType);

    if (image->units != units)
    {
        switch (image->units)
        {
            case PixelsPerInchResolution:
                if (units == PixelsPerCentimeterResolution)
                {
#if defined(IMAGEMAGICK_7)
                    image->resolution.x /= 2.54;
                    image->resolution.y /= 2.54;
#else
                    image->x_resolution /= 2.54;
                    image->y_resolution /= 2.54;
#endif
                }
                break;

            case PixelsPerCentimeterResolution:
                if (units == PixelsPerInchResolution)
                {
#if defined(IMAGEMAGICK_7)
                    image->resolution.x *= 2.54;
                    image->resolution.y *= 2.54;
#else
                    image->x_resolution *= 2.54;
                    image->y_resolution *= 2.54;
#endif
                }
                break;

            default:
                // UndefinedResolution
#if defined(IMAGEMAGICK_7)
                image->resolution.x = 0.0;
                image->resolution.y = 0.0;
#else
                image->x_resolution = 0.0;
                image->y_resolution = 0.0;
#endif
                break;
        }

        image->units = units;
    }

    return restype;
}

#unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05) ⇒ Magick::Image

Sharpen an image. “amount” is the percentage of the difference between the original and the blur image that is added back into the original. “threshold” is the threshold in pixels needed to apply the diffence amount.

Returns a new image.

Parameters:

  • radius (Float) (defaults to: 0.0) —

    The radius of the Gaussian operator.

  • sigma (Float) (defaults to: 1.0) —

    The standard deviation of the Gaussian operator.

  • amount (Float) (defaults to: 1.0) —

    The percentage of the blurred image to be added to the receiver, specified as a fraction between 0 and 1.0

  • threshold (Float) (defaults to: 0.05) —

    The threshold needed to apply the amount, specified as a fraction between 0 and 1.0

Returns:



15289
15290
15291
15292
15293
15294
15295
15296
15297
15298
15299
15300
15301
15302
15303
15304
15305
15306
15307
 
# File 'ext/RMagick/rmimage.cpp', line 15289

VALUE
Image_unsharp_mask(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(UnsharpMaskImage) args = { image, radius, sigma, amount, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(UnsharpMaskImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, channel = Magick::AllChannels) ⇒ Magick::Image #unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, *channels) ⇒ Magick::Image

Sharpen an image. “amount” is the percentage of the difference between the original and the blur image that is added back into the original. “threshold” is the threshold in pixels needed to apply the diffence amount.

Only the specified channels are sharpened.

Overloads:

  • #unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Gaussian operator.

    • amount (Float) (defaults to: 1.0) —

      The percentage of the blurred image to be added to the receiver, specified as a fraction between 0 and 1.0

    • threshold (Float) (defaults to: 0.05) —

      The threshold needed to apply the amount, specified as a fraction between 0 and 1.0

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Float) (defaults to: 0.0) —

      The radius of the Gaussian operator.

    • sigma (Float) (defaults to: 1.0) —

      The standard deviation of the Gaussian operator.

    • amount (Float) (defaults to: 1.0) —

      The percentage of the blurred image to be added to the receiver, specified as a fraction between 0 and 1.0

    • threshold (Float) (defaults to: 0.05) —

      The threshold needed to apply the amount, specified as a fraction between 0 and 1.0

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



15337
15338
15339
15340
15341
15342
15343
15344
15345
15346
15347
15348
15349
15350
15351
15352
15353
15354
15355
15356
15357
15358
15359
15360
15361
15362
15363
15364
15365
15366
15367
15368
15369
 
# File 'ext/RMagick/rmimage.cpp', line 15337

VALUE
Image_unsharp_mask_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 4)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(UnsharpMaskImage) args = { image, radius, sigma, amount, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(UnsharpMaskImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(UnsharpMaskImageChannel) args = { image, channels, radius, sigma, amount, threshold, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(UnsharpMaskImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#view(x, y, width, height) ⇒ Object

Construct a view. If a block is present, yield and pass the view object, otherwise return the view object.



1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
 
# File 'lib/rmagick_internal.rb', line 1023

def view(x, y, width, height)
  view = View.new(self, x, y, width, height)

  return view unless block_given?

  begin
    yield(view)
  ensure
    view.sync
  end
  nil
end

#vignette(horz_radius = self.columns*0.1+0.5, vert_radius = self.rows*0.1+0.5, radius = 0.0, sigma = 1.0) ⇒ Magick::Image

Soften the edges of an image.

Returns a new image.

Parameters:

  • horz_radius (Float) (defaults to: self.columns*0.1+0.5) —

    Influences the amount of background color in the horizontal dimension.

  • vert_radius (Float) (defaults to: self.rows*0.1+0.5) —

    Influences the amount of background color in the vertical dimension.

  • radius (Float) (defaults to: 0.0) —

    Controls the amount of blurring.

  • sigma (Float) (defaults to: 1.0) —

    Controls the amount of blurring.

Returns:



15382
15383
15384
15385
15386
15387
15388
15389
15390
15391
15392
15393
15394
15395
15396
15397
15398
15399
15400
15401
15402
15403
15404
15405
15406
15407
15408
15409
15410
15411
15412
15413
15414
15415
15416
15417
15418
15419
15420
 
# File 'ext/RMagick/rmimage.cpp', line 15382

VALUE
Image_vignette(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    long horz_radius, vert_radius;
    double radius = 0.0, sigma = 10.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    horz_radius = (long)(image->columns * 0.10 + 0.5);
    vert_radius = (long)(image->rows * 0.10 + 0.5);

    switch (argc)
    {
        case 4:
            sigma = NUM2DBL(argv[3]);
        case 3:
            radius = NUM2DBL(argv[2]);
        case 2:
            vert_radius = NUM2INT(argv[1]);
        case 1:
            horz_radius = NUM2INT(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
            break;
    }

    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(VignetteImage) args = { image, radius, sigma, horz_radius, vert_radius, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(VignetteImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#virtual_pixel_method ⇒ Magick::VirtualPixelMethod

Get the “virtual pixels” behave. Virtual pixels are pixels that are outside the boundaries of the image.

Returns:

  • (Magick::VirtualPixelMethod) —

    the VirtualPixelMethod



15429
15430
15431
15432
15433
15434
15435
15436
15437
15438
 
# File 'ext/RMagick/rmimage.cpp', line 15429

VALUE
Image_virtual_pixel_method(VALUE self)
{
    Image *image;
    VirtualPixelMethod vpm;

    image = rm_check_destroyed(self);
    vpm = GetImageVirtualPixelMethod(image);
    return VirtualPixelMethod_find(vpm);
}

#virtual_pixel_method=(method) ⇒ Magick::VirtualPixelMethod

Specify how “virtual pixels” behave. Virtual pixels are pixels that are outside the boundaries of the image.

Parameters:

  • method (Magick::VirtualPixelMethod) —

    the VirtualPixelMethod

Returns:

  • (Magick::VirtualPixelMethod) —

    the given method



15448
15449
15450
15451
15452
15453
15454
15455
15456
15457
15458
15459
15460
15461
15462
15463
15464
15465
15466
15467
15468
15469
 
# File 'ext/RMagick/rmimage.cpp', line 15448

VALUE
Image_virtual_pixel_method_eq(VALUE self, VALUE method)
{
    Image *image;
    VirtualPixelMethod vpm;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);
    VALUE_TO_ENUM(method, vpm, VirtualPixelMethod);
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    SetImageVirtualPixelMethod(image, vpm, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageVirtualPixelMethod(image, vpm);
    rm_check_image_exception(image, RetainOnError);
#endif
    return method;
}

#watermark(mark, brightness = 1.0, saturation = 1.0, x_off = 0, y_off = 0) ⇒ Magick::Image #watermark(mark, brightness, saturation, gravity, x_off = 0, y_off = 0) ⇒ Magick::Image

Composites a watermark image on the target image using the Modulate composite operator. This composite operation operates in the HSL colorspace and combines part of the lightness, part of the saturation, and all of the hue of each pixel in the watermark with the corresponding pixel in the target image

Overloads:

  • #watermark(mark, brightness = 1.0, saturation = 1.0, x_off = 0, y_off = 0) ⇒ Magick::Image

    Parameters:

    • mark (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • brightness (Float) (defaults to: 1.0) —

      The fraction of the lightness component of the watermark pixels to be composited onto the target image. Must be a non-negative number or a string in the form “NN%”. If lightness is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. The default is 100%.

    • saturation (Float) (defaults to: 1.0) —

      The fraction of the saturation component of the watermark pixels to be composited onto the target image. Must be a non-negative number or a string in the form “NN%”. If lightness is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. The default is 100%.

    • x_off (Numeric) (defaults to: 0) —

      The offset of the watermark, measured from the left-hand side of the target image.

    • y_off (Numeri) (defaults to: 0) —

      The offset of the watermark, measured from the top of the target image.

  • #watermark(mark, brightness, saturation, gravity, x_off = 0, y_off = 0) ⇒ Magick::Image

    Parameters:

    • mark (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • brightness (Float) —

      The fraction of the lightness component of the watermark pixels to be composited onto the target image. Must be a non-negative number or a string in the form “NN%”. If lightness is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. The default is 100%.

    • saturation (Float) —

      The fraction of the saturation component of the watermark pixels to be composited onto the target image. Must be a non-negative number or a string in the form “NN%”. If lightness is a number it is interpreted as a percentage. Both 0.25 and “25%” mean 25%. The default is 100%.

    • gravity (Magick::GravityType) —

      the gravity for offset. the offsets are measured from the NorthWest corner by default.

    • x_off (Numeric) (defaults to: 0) —

      The offset of the watermark, measured from the left-hand side of the target image.

    • y_off (Numeri) (defaults to: 0) —

      The offset of the watermark, measured from the top of the target image.

Returns:



15512
15513
15514
15515
15516
15517
15518
15519
15520
15521
15522
15523
15524
15525
15526
15527
15528
15529
15530
15531
15532
15533
15534
15535
15536
15537
15538
15539
15540
15541
15542
15543
15544
15545
15546
15547
15548
15549
15550
15551
15552
15553
15554
15555
15556
15557
15558
15559
15560
15561
15562
15563
15564
15565
15566
15567
15568
15569
15570
15571
15572
15573
15574
15575
 
# File 'ext/RMagick/rmimage.cpp', line 15512

VALUE
Image_watermark(int argc, VALUE *argv, VALUE self)
{
    Image *image, *overlay, *new_image;
    double src_percent = 100.0, dst_percent = 100.0;
    long x_offset = 0L, y_offset = 0L;
    char geometry[20];
    VALUE ovly;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    if (argc < 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
    }

    ovly = rm_cur_image(argv[0]);
    overlay = rm_check_destroyed(ovly);

    if (argc > 3)
    {
        get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
        // There must be 3 arguments left
        argc = 3;
    }

    switch (argc)
    {
        case 3:
            dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
        case 2:
            src_percent = rm_percentage(argv[1], 1.0) * 100.0;
        case 1:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
            break;
    }

    blend_geometry(geometry, sizeof(geometry), src_percent, dst_percent);
    CloneString(&overlay->geometry, geometry);
    SetImageArtifact(overlay, "compose:args", geometry);

    new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CompositeImage) args = { new_image, overlay, ModulateCompositeOp, MagickTrue, x_offset, y_offset, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompositeImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(CompositeImage) args = { new_image, ModulateCompositeOp, overlay, x_offset, y_offset };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompositeImage), &args);

    rm_check_image_exception(new_image, DestroyOnError);
#endif

    RB_GC_GUARD(ovly);

    return rm_image_new(new_image);
}

#wave(amplitude = 25.0, wavelength = 150.0) ⇒ Magick::Image

Create a “ripple” effect in the image by shifting the pixels vertically along a sine wave whose amplitude and wavelength is specified by the given parameters.

Returns a new image.

Parameters:

  • amplitude (Float) (defaults to: 25.0) —

    the amplitude

  • wavelength (Float) (defaults to: 150.0) —

    the wave length

Returns:



15587
15588
15589
15590
15591
15592
15593
15594
15595
15596
15597
15598
15599
15600
15601
15602
15603
15604
15605
15606
15607
15608
15609
15610
15611
15612
15613
15614
15615
15616
15617
15618
15619
 
# File 'ext/RMagick/rmimage.cpp', line 15587

VALUE
Image_wave(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double amplitude = 25.0, wavelength = 150.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 2:
            wavelength = NUM2DBL(argv[1]);
        case 1:
            amplitude = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(WaveImage) args = { image, amplitude, wavelength, image->interpolate, exception };
#else
    GVL_STRUCT_TYPE(WaveImage) args = { image, amplitude, wavelength, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(WaveImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#wet_floor(initial = 0.5, rate = 1.0) ⇒ Magick::Image

Creates a “wet floor” reflection. The reflection is an inverted copy of the image that changes from partially transparent to entirely transparent. By default only the bottom third of the image appears in the reflection.

Returns a new image.

Parameters:

  • initial (Float) (defaults to: 0.5) —

    A value between 0.0 and 1.0 that specifies the initial percentage of transparency. Higher values cause the top of the reflection to be more transparent, lower values less transparent. The default is 0.5, which means that the top of the reflection is 50% transparent.

  • rate (Float) (defaults to: 1.0) —

    A non-negative value that specifies how rapidly the reflection transitions from the initial level of transparency to entirely transparent. The default value is 1.0, which means that the transition occurs in 1/3 the image height. Values greater than 1.0 speed up the transition (the reflection will have fewer rows), values lower than 1.0 slow down the transition (the reflection will have more rows). A value of 0.0 means that the level of transparency will not change.

Returns:

See Also:



15641
15642
15643
15644
15645
15646
15647
15648
15649
15650
15651
15652
15653
15654
15655
15656
15657
15658
15659
15660
15661
15662
15663
15664
15665
15666
15667
15668
15669
15670
15671
15672
15673
15674
15675
15676
15677
15678
15679
15680
15681
15682
15683
15684
15685
15686
15687
15688
15689
15690
15691
15692
15693
15694
15695
15696
15697
15698
15699
15700
15701
15702
15703
15704
15705
15706
15707
15708
15709
15710
15711
15712
15713
15714
15715
15716
15717
15718
15719
15720
15721
15722
15723
15724
15725
15726
15727
15728
15729
15730
15731
15732
15733
15734
15735
15736
15737
15738
15739
15740
15741
15742
15743
15744
15745
15746
15747
15748
15749
15750
15751
15752
15753
15754
15755
15756
15757
15758
15759
15760
15761
15762
15763
15764
15765
15766
15767
15768
15769
15770
15771
15772
15773
15774
15775
15776
15777
15778
15779
15780
15781
15782
15783
15784
15785
15786
15787
15788
15789
15790
15791
15792
15793
15794
15795
15796
15797
15798
15799
15800
15801
15802
15803
15804
15805
15806
 
# File 'ext/RMagick/rmimage.cpp', line 15641

VALUE
Image_wet_floor(int argc, VALUE *argv, VALUE self)
{
    Image *image, *reflection, *flip_image;
#if defined(IMAGEMAGICK_7)
    const Quantum *p;
    Quantum *q;
#else
    const PixelPacket *p;
    PixelPacket *q;
#endif
    RectangleInfo geometry;
    long x, y, max_rows;
    double initial = 0.5;
    double rate = 1.0;
    double opacity, step;
    const char *func;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 2:
            rate = NUM2DBL(argv[1]);
        case 1:
            initial = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
            break;
    }


    if (initial < 0.0 || initial > 1.0)
    {
        rb_raise(rb_eArgError, "Initial transparency must be in the range 0.0-1.0 (%g)", initial);
    }
    if (rate < 0.0)
    {
        rb_raise(rb_eArgError, "Transparency change rate must be >= 0.0 (%g)", rate);
    }

#if defined(IMAGEMAGICK_7)
    initial *= QuantumRange;
#else
    initial *= TransparentOpacity;
#endif

    // The number of rows in which to transition from the initial level of
    // transparency to complete transparency. rate == 0.0 -> no change.
    if (rate > 0.0)
    {
        max_rows = (long)((double)image->rows) / (3.0 * rate);
        max_rows = (long)min((unsigned long)max_rows, image->rows);
#if defined(IMAGEMAGICK_7)
        step =  (QuantumRange - initial) / max_rows;
#else
        step =  (TransparentOpacity - initial) / max_rows;
#endif
    }
    else
    {
        max_rows = (long)image->rows;
        step = 0.0;
    }


    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(FlipImage) args_FlipImage = { image, exception };
    flip_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FlipImage), &args_FlipImage);
    CHECK_EXCEPTION();


    geometry.x = 0;
    geometry.y = 0;
    geometry.width = image->columns;
    geometry.height = max_rows;
    GVL_STRUCT_TYPE(CropImage) args_CropImage = { flip_image, &geometry, exception };
    reflection = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CropImage), &args_CropImage);
    DestroyImage(flip_image);
    CHECK_EXCEPTION();


#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(SetImageStorageClass) args_SetImageStorageClass = { reflection, DirectClass, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args_SetImageStorageClass);
    rm_check_exception(exception, reflection, DestroyOnError);
    GVL_STRUCT_TYPE(SetImageAlphaChannel) args_SetImageAlphaChannel = { reflection, ActivateAlphaChannel, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageAlphaChannel), &args_SetImageAlphaChannel);
    rm_check_exception(exception, reflection, DestroyOnError);
#else
    GVL_STRUCT_TYPE(SetImageStorageClass) args_SetImageStorageClass = { reflection, DirectClass };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SetImageStorageClass), &args_SetImageStorageClass);
    rm_check_image_exception(reflection, DestroyOnError);


    reflection->matte = MagickTrue;
#endif
    opacity = initial;

    for (y = 0; y < max_rows; y++)
    {
#if defined(IMAGEMAGICK_7)
        if (opacity > QuantumRange)
        {
            opacity = QuantumRange;
        }
#else
        if (opacity > TransparentOpacity)
        {
            opacity = TransparentOpacity;
        }
#endif

        GVL_STRUCT_TYPE(GetVirtualPixels) args_GetVirtualPixels = { reflection, 0, y, image->columns, 1, exception };
        void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetVirtualPixels), &args_GetVirtualPixels);
        p = reinterpret_cast<decltype(p)>(ret);
        rm_check_exception(exception, reflection, DestroyOnError);
        if (!p)
        {
            func = "AcquireImagePixels";
            goto error;
        }

        q = QueueAuthenticPixels(reflection, 0, y, image->columns, 1, exception);

        rm_check_exception(exception, reflection, DestroyOnError);
        if (!q)
        {
            func = "SetImagePixels";
            goto error;
        }

        for (x = 0; x < (long) image->columns; x++)
        {
            // Never make a pixel *less* transparent than it already is.
#if defined(IMAGEMAGICK_7)
            *q = *p;
            SetPixelAlpha(reflection, min(GetPixelAlpha(image, q), QuantumRange - (Quantum)opacity), q);

            p += GetPixelChannels(reflection);
            q += GetPixelChannels(reflection);
#else
            q[x] = p[x];
            q[x].opacity = max(q[x].opacity, (Quantum)opacity);
#endif
        }

        GVL_STRUCT_TYPE(SyncAuthenticPixels) args_SyncAuthenticPixels = { reflection, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SyncAuthenticPixels), &args_SyncAuthenticPixels);
        rm_check_exception(exception, reflection, DestroyOnError);

        opacity += step;
    }


    DestroyExceptionInfo(exception);
    return rm_image_new(reflection);

    error:
    DestroyExceptionInfo(exception);
    DestroyImage(reflection);
    rb_raise(rb_eRuntimeError, "%s failed on row %lu", func, y);
    return(VALUE)0;
}

#white_threshold(red, green, blue, alpha: alpha) ⇒ Magick::Image

Forces all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

Returns a new image.

Parameters:

  • red (Float) —

    the number for red channel

  • green (Float) —

    the number for green channel

  • blue (Float) —

    the number for blue channel

  • alpha (Numeric) (defaults to: alpha) —

    the number for alpha channel

Returns:

See Also:



15821
15822
15823
15824
15825
 
# File 'ext/RMagick/rmimage.cpp', line 15821

VALUE
Image_white_threshold(int argc, VALUE *argv, VALUE self)
{
    return threshold_image(argc, argv, self, GVL_FUNC(WhiteThresholdImage));
}

#write(file) ⇒ Magick::Image

Write the image to the file.

Parameters:

  • file (File, String) —

    the file

Returns:



15928
15929
15930
15931
15932
15933
15934
15935
15936
15937
15938
15939
15940
15941
15942
15943
15944
15945
15946
15947
15948
15949
15950
15951
15952
15953
15954
15955
15956
15957
15958
15959
15960
15961
15962
15963
15964
15965
15966
15967
15968
15969
15970
15971
15972
15973
15974
15975
15976
15977
15978
15979
15980
15981
15982
15983
 
# File 'ext/RMagick/rmimage.cpp', line 15928

VALUE
Image_write(VALUE self, VALUE file)
{
    Image *image;
    Info *info;
    VALUE info_obj;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

    if (TYPE(file) == T_FILE)
    {
        rb_io_t *fptr;

        // Ensure file is open - raise error if not
        GetOpenFile(file, fptr);
        rb_io_check_writable(fptr);

        add_format_prefix(info, rm_io_path(file));
#if defined(_WIN32)
        SetImageInfoFile(info, NULL);
#else
        SetImageInfoFile(info, rb_io_stdio_file(fptr));
#endif
    }
    else
    {
        add_format_prefix(info, file);
        SetImageInfoFile(info, NULL);
    }
    strlcpy(image->filename, info->filename, sizeof(image->filename));

    rm_sync_image_options(image, info);

    info->adjoin = MagickFalse;
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(WriteImage) args = { info, image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(WriteImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(WriteImage) args = { info, image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(WriteImage), &args);
    rm_check_image_exception(image, RetainOnError);
#endif

    RB_GC_GUARD(info_obj);

    return self;
}

#x_resolution ⇒ Float

Get the horizontal resolution of the image.

Returns:

  • (Float) —

    the resolution



16037
16038
16039
16040
16041
 
# File 'ext/RMagick/rmimage.cpp', line 16037

VALUE
Image_x_resolution(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, x_resolution, dbl, &rm_image_data_type);
}

#x_resolution=(val) ⇒ Float

Set the horizontal resolution of the image.

Parameters:

  • val (Float) —

    the resolution

Returns:

  • (Float) —

    the given resolution



16049
16050
16051
16052
16053
 
# File 'ext/RMagick/rmimage.cpp', line 16049

VALUE
Image_x_resolution_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, x_resolution, dbl, &rm_image_data_type);
}

#y_resolution ⇒ Float

Get the vertical resolution of the image.

Returns:

  • (Float) —

    the resolution



16060
16061
16062
16063
16064
 
# File 'ext/RMagick/rmimage.cpp', line 16060

VALUE
Image_y_resolution(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Image, y_resolution, dbl, &rm_image_data_type);
}

#y_resolution=(val) ⇒ Float

Set the vertical resolution of the image.

Parameters:

  • val (Float) —

    the resolution

Returns:

  • (Float) —

    the given resolution



16072
16073
16074
16075
16076
 
# File 'ext/RMagick/rmimage.cpp', line 16072

VALUE
Image_y_resolution_eq(VALUE self, VALUE val)
{
    IMPLEMENT_TYPED_ATTR_WRITER(Image, y_resolution, dbl, &rm_image_data_type);
}