Class: Magick::Image

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

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.


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
9467
9468
9469
9470
9471
9472
9473
9474
9475
9476
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
9504
9505
9506
9507
9508
9509
9510
9511
9512
# File 'ext/RMagick/rmimage.c', line 9439

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();
    Data_Get_Struct(info_obj, Info, 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();
    SetImageExtent(image, cols, rows, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageExtent(image, cols, rows);
#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();
        SetImageBackgroundColor(image, exception);
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);
#else
        SetImageBackgroundColor(image);
#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:


8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
# File 'ext/RMagick/rmimage.c', line 8464

VALUE
Image__load(VALUE class ATTRIBUTE_UNUSED, VALUE str)
{
    Image *image;
    ImageInfo *info;
    DumpedImage mi;
    ExceptionInfo *exception;
    char *blob;
    long 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 <= (long)(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;
    image = BlobToImage(info, blob, (size_t) length, exception);
    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

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 {
  self.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

    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:


2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
# File 'ext/RMagick/rmimage.c', line 2001

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();
    Data_Get_Struct(info_obj, Info, 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:


4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
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
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
# File 'ext/RMagick/rmimage.c', line 4035

VALUE
Image_constitute(VALUE class ATTRIBUTE_UNUSED, VALUE width_arg, VALUE height_arg,
                 VALUE map_arg, VALUE pixels_arg)
{
    Image *new_image;
    VALUE pixel, pixel0;
    long width, height, x, npixels, 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);

    width = NUM2LONG(width_arg);
    height = NUM2LONG(height_arg);

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

    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();
    SetImageExtent(new_image, width, height, exception);
#else
    SetImageExtent(new_image, width, height);
    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)
    SetImageBackgroundColor(new_image, exception);
#else
    SetImageBackgroundColor(new_image);
    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)
    ImportImagePixels(new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v, exception);
    xfree(pixels.v);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    ImportImagePixels(new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v);
    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) { ... } ⇒ 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) { ... } ⇒ Array<Magick::Image>

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

    Parameters:

    • blob (String)

      the blob data

    Yields:

Returns:

See Also:


6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
# File 'ext/RMagick/rmimage.c', line 6890

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

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

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

    exception = AcquireExceptionInfo();
    images = BlobToImage(info,  blob, (size_t)length, exception);
    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:


10120
10121
10122
10123
10124
# File 'ext/RMagick/rmimage.c', line 10120

VALUE
Image_ping(VALUE class, VALUE file_arg)
{
    return rd_image(class, file_arg, 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


11011
11012
11013
11014
11015
# File 'ext/RMagick/rmimage.c', line 11011

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

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

Read a Base64-encoded image.

Parameters:

  • content (String)

    the content

Returns:


11213
11214
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
# File 'ext/RMagick/rmimage.c', line 11213

VALUE
Image_read_inline(VALUE self ATTRIBUTE_UNUSED, VALUE content)
{
    VALUE info_obj;
    Image *images;
    ImageInfo *info;
    char *image_data;
    long 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;
    }

    blob = Base64Decode(image_data, &blob_l);
    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();
    Data_Get_Struct(info_obj, Info, info);

    images = BlobToImage(info, blob, blob_l, exception);
    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


12834
12835
12836
12837
12838
12839
12840
12841
12842
12843
12844
12845
12846
12847
12848
12849
12850
12851
12852
12853
12854
12855
12856
12857
12858
12859
12860
12861
12862
12863
12864
12865
12866
12867
12868
12869
12870
12871
12872
12873
12874
12875
12876
# File 'ext/RMagick/rmimage.c', line 12834

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();
    SignatureImage(imageA, exception);
    CHECK_EXCEPTION();
    SignatureImage(imageB, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SignatureImage(imageA);
    SignatureImage(imageB);
#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:


726
727
728
729
730
731
732
733
734
735
736
737
738
739
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
# File 'ext/RMagick/rmimage.c', line 726

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:


781
782
783
784
785
786
787
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
# File 'ext/RMagick/rmimage.c', line 781

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


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
5755
5756
5757
5758
5759
5760
5761
5762
5763
# File 'ext/RMagick/rmimage.c', line 5710

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();
    blob = ImageToBlob(info, image, &length, exception);

    // 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:


214
215
216
217
218
# File 'ext/RMagick/rmimage.c', line 214

VALUE
Image_adaptive_blur(int argc, VALUE *argv, VALUE self)
{
    return adaptive_method(argc, argv, self, 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:


237
238
239
240
241
242
243
244
245
# File 'ext/RMagick/rmimage.c', line 237

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


262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
# File 'ext/RMagick/rmimage.c', line 262

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();
    new_image = AdaptiveResizeImage(image, columns, rows, exception);
    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:


323
324
325
326
327
# File 'ext/RMagick/rmimage.c', line 323

VALUE
Image_adaptive_sharpen(int argc, VALUE *argv, VALUE self)
{
    return adaptive_method(argc, argv, self, 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:


346
347
348
349
350
351
352
353
354
# File 'ext/RMagick/rmimage.c', line 346

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

#adaptive_threshold(width = 3, height = 3, offset = 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.

  • offset (Numeric) (defaults to: 0)

    the mean offset

Returns:


369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
# File 'ext/RMagick/rmimage.c', line 369

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

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 3:
            offset = NUM2LONG(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();
    new_image = AdaptiveThresholdImage(image, width, height, offset, exception);
    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:


413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
# File 'ext/RMagick/rmimage.c', line 413

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();
    NegateImage(clip_mask, MagickFalse, exception);
    rm_check_exception(exception, clip_mask, DestroyOnError);
    SetImageMask(image, CompositePixelMask, clip_mask, exception);
    DestroyImage(clip_mask);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    // Delete any previously-existing mask image.
    // Store a clone of the new mask image.
    SetImageMask(image, mask_image);
    NegateImage(image->mask, MagickFalse);

    // 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:


459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
# File 'ext/RMagick/rmimage.c', line 459

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)
    new_image = AddNoiseImage(image, noise_type, 1.0, exception);
#else
    new_image = AddNoiseImage(image, noise_type, exception);
#endif
    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:


495
496
497
498
499
500
501
502
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
# File 'ext/RMagick/rmimage.c', line 495

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 &= ~OpacityChannel;

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    new_image = AddNoiseImage(image, noise_type, 1.0, exception);
    END_CHANNEL_MASK(new_image);
#else
    new_image = AddNoiseImageChannel(image, channels, noise_type, exception);
#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:


541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
# File 'ext/RMagick/rmimage.c', line 541

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)
            ProfileImage(image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), exception);
            if (rm_should_raise_exception(exception, RetainExceptionRetention))
#else
            ProfileImage(image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), MagickFalse);
            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:


693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
# File 'ext/RMagick/rmimage.c', line 693

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();
    new_image = AffineTransformImage(image, &matrix, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#alphaBoolean #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:

  • #alphaBoolean

    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


631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
# File 'ext/RMagick/rmimage.c', line 631

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();
    SetImageAlphaChannel(image, alpha, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageAlphaChannel(image, alpha);
    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


675
676
677
678
679
680
681
682
683
684
# File 'ext/RMagick/rmimage.c', line 675

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.


823
824
825
826
827
# File 'lib/rmagick_internal.rb', line 823

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:


922
923
924
925
926
927
928
929
930
# File 'ext/RMagick/rmimage.c', line 922

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


944
945
946
947
948
949
950
951
952
# File 'ext/RMagick/rmimage.c', line 944

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

#auto_orientMagick::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:


1033
1034
1035
1036
1037
1038
# File 'ext/RMagick/rmimage.c', line 1033

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:


1050
1051
1052
1053
1054
1055
# File 'ext/RMagick/rmimage.c', line 1050

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

#background_colorString

Return the name of the background color as a String.

Returns:

  • (String)

    the background color


1063
1064
1065
1066
1067
1068
# File 'ext/RMagick/rmimage.c', line 1063

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:


1077
1078
1079
1080
1081
1082
1083
# File 'ext/RMagick/rmimage.c', line 1077

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_columnsNumeric

Return the number of rows (before transformations).

Returns:

  • (Numeric)

    the number of rows


1091
1092
1093
1094
1095
1096
# File 'ext/RMagick/rmimage.c', line 1091

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

#base_filenameString

Return the image filename (before transformations).

Returns:

  • (String)

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


1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
# File 'ext/RMagick/rmimage.c', line 1103

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_rowsNumeric

Return the number of rows (before transformations).

Returns:

  • (Numeric)

    the number of rows


1122
1123
1124
1125
1126
1127
# File 'ext/RMagick/rmimage.c', line 1122

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

#biasFloat

Get image bias (used when convolving an image).

Returns:

  • (Float)

    the image bias


1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
# File 'ext/RMagick/rmimage.c', line 1135

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


1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
# File 'ext/RMagick/rmimage.c', line 1169

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:


1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
# File 'ext/RMagick/rmimage.c', line 1205

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);
    BilevelImage(new_image, threshold, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    BilevelImageChannel(new_image, channels, threshold);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#black_point_compensationBoolean

Return current black point compensation attribute.

Returns:

  • (Boolean)

    true or false


1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
# File 'ext/RMagick/rmimage.c', line 1251

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


1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
# File 'ext/RMagick/rmimage.c', line 1282

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:


1322
1323
1324
1325
1326
# File 'ext/RMagick/rmimage.c', line 1322

VALUE
Image_black_threshold(int argc, VALUE *argv, VALUE self)
{
    return threshold_image(argc, argv, self, 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:


1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
# File 'ext/RMagick/rmimage.c', line 1668

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:


1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
# File 'ext/RMagick/rmimage.c', line 1724

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();
    new_image = BlueShiftImage(image, factor, exception);
    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:


1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
# File 'ext/RMagick/rmimage.c', line 1770

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);
    new_image = BlurImage(image, radius, sigma, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = BlurImageChannel(image, channels, radius, sigma, exception);
#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:


1819
1820
1821
1822
1823
# File 'ext/RMagick/rmimage.c', line 1819

VALUE
Image_blur_image(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, 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:


1905
1906
1907
1908
1909
1910
# File 'ext/RMagick/rmimage.c', line 1905

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


1889
1890
1891
1892
1893
1894
# File 'ext/RMagick/rmimage.c', line 1889

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

#border_colorString

Return the name of the border color as a String.

Returns:

  • (String)

    the name of the border color


1918
1919
1920
1921
1922
1923
# File 'ext/RMagick/rmimage.c', line 1918

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:


1932
1933
1934
1935
1936
1937
1938
# File 'ext/RMagick/rmimage.c', line 1932

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_boxMagick::Rectangle

Returns the bounding box of an image canvas.

Returns:

  • (Magick::Rectangle)

    the bounding box


1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
# File 'ext/RMagick/rmimage.c', line 1946

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:

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:


2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
# File 'ext/RMagick/rmimage.c', line 2078

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:

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:


2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
# File 'ext/RMagick/rmimage.c', line 2078

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


2118
2119
2120
2121
2122
2123
2124
# File 'ext/RMagick/rmimage.c', line 2118

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:


2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
# File 'ext/RMagick/rmimage.c', line 2134

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();
    new_image = SeparateImage(image, channel, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    new_image = rm_clone_image(image);
    SeparateImageChannel(new_image, channel);

    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) { ... } ⇒ Array #compare_channel(image, metric, *channels) ⇒ Array #compare_channel(image, metric, *channels) { ... } ⇒ 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) { ... } ⇒ Array

    If present a block, compare_channel yields to a block in which you can set optional arguments by setting attributes on self.

    • self.highlight_color = color

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

    • self.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) { ... } ⇒ Array

    If present a block, compare_channel yields to a block in which you can set optional arguments by setting attributes on self.

    • self.highlight_color = color

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

    • self.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.


3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
# File 'ext/RMagick/rmimage.c', line 3143

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);
    difference_image = CompareImages(image, r_image, metric_type, &distortion, exception);
    END_CHANNEL_MASK(image);
#else
    difference_image = CompareImageChannels(image, r_image, channels, metric_type, &distortion, exception);
#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


2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
# File 'ext/RMagick/rmimage.c', line 2174

VALUE
Image_channel_depth(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    ChannelType channels;
    unsigned long 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);
    channel_depth = GetImageDepth(image, exception);
    END_CHANNEL_MASK(image);
#else
    channel_depth = GetImageChannelDepth(image, channels, exception);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return ULONG2NUM(channel_depth);
}

#channel_entropy(*args) ⇒ Object


2364
2365
2366
2367
2368
# File 'ext/RMagick/rmimage.c', line 2364

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.


2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
# File 'ext/RMagick/rmimage.c', line 2220

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);
    GetImageExtrema(image, &min, &max, exception);
    END_CHANNEL_MASK(image);
#else
    GetImageChannelExtrema(image, channels, &min, &max, exception);
#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.


2273
2274
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
# File 'ext/RMagick/rmimage.c', line 2273

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);
    GetImageMean(image, &mean, &stddev, exception);
    END_CHANNEL_MASK(image);
#else
    GetImageChannelMean(image, channels, &mean, &stddev, exception);
#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:


2379
2380
2381
2382
2383
# File 'ext/RMagick/rmimage.c', line 2379

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

#check_destroyednil

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

Returns:

  • (nil)

    nil

Raises:


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

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:


2409
2410
2411
2412
2413
2414
# File 'ext/RMagick/rmimage.c', line 2409

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, ChopImage);
}

#chromaticityMagick::Chromaticity

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

Returns:

  • (Magick::Chromaticity)

    the chromaticity values


2422
2423
2424
2425
2426
2427
# File 'ext/RMagick/rmimage.c', line 2422

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


2436
2437
2438
2439
2440
2441
2442
# File 'ext/RMagick/rmimage.c', line 2436

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

#class_typeMagick::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


13254
13255
13256
13257
13258
13259
# File 'ext/RMagick/rmimage.c', line 13254

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


13268
13269
13270
13271
13272
13273
13274
13275
13276
13277
13278
13279
13280
13281
13282
13283
13284
13285
13286
13287
13288
13289
13290
13291
13292
13293
13294
13295
13296
13297
13298
13299
13300
13301
13302
13303
13304
13305
13306
13307
13308
13309
13310
13311
13312
13313
13314
13315
13316
13317
13318
13319
13320
13321
13322
# File 'ext/RMagick/rmimage.c', line 13268

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)
        SyncImage(image, exception);
        CHECK_EXCEPTION();
#else
        SyncImage(image);
#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)
        QuantizeImage(&qinfo, image, exception);
        CHECK_EXCEPTION();
#else
        QuantizeImage(&qinfo, image);
#endif
    }

#if defined(IMAGEMAGICK_7)
    SetImageStorageClass(image, class_type, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageStorageClass(image, class_type);
#endif
    return new_class_type;
}

#cloneMagick::Image

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

Returns:


2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
# File 'ext/RMagick/rmimage.c', line 2451

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:


2491
2492
2493
2494
2495
2496
2497
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.c', line 2491

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);
    }

    Data_Get_Struct(argv[0], Image, clut);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(image, channels);
    okay = ClutImage(image, clut, image->interpolate, exception);
    END_CHANNEL_MASK(image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    okay = ClutImageChannel(image, channels, clut);
    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


845
846
847
# File 'lib/rmagick_internal.rb', line 845

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:


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
2827
2828
2829
2830
2831
2832
2833
2834
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
# File 'ext/RMagick/rmimage.c', line 2785

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();
    FloodfillPaintImage(new_image, draw_info, &target_mpp, x, y, invert, exception);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    FloodfillPaintImage(new_image, DefaultChannels, draw_info, &target_mpp, x, y, invert);

    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


838
839
840
841
# File 'lib/rmagick_internal.rb', line 838

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

#color_histogramHash

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.


2547
2548
2549
2550
2551
2552
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
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
# File 'ext/RMagick/rmimage.c', line 2547

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)
        SetImageStorageClass(dc_copy, DirectClass, exception);
#else
        SetImageStorageClass(dc_copy, DirectClass);
#endif
        image = dc_copy;
    }

    histogram = GetImageHistogram(image, &colors, exception);

    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


830
831
832
833
834
# File 'lib/rmagick_internal.rb', line 830

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

#color_profileString?

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


2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
# File 'ext/RMagick/rmimage.c', line 2735

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


2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
# File 'ext/RMagick/rmimage.c', line 2762

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


851
852
853
854
855
856
857
858
859
860
861
862
863
# File 'lib/rmagick_internal.rb', line 851

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:


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
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
# File 'ext/RMagick/rmimage.c', line 2884

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)
    new_image = ColorizeImage(image, opacity, &target, exception);
#else
    new_image = ColorizeImage(image, opacity, target, exception);
#endif
    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


2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
# File 'ext/RMagick/rmimage.c', line 2947

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);
}

#colorsNumeric

Get the number of colors in the colormap.

Returns:

  • (Numeric)

    the number of colors


3029
3030
3031
3032
3033
# File 'ext/RMagick/rmimage.c', line 3029

VALUE
Image_colors(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, colors, ulong);
}

#colorspaceMagick::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


3042
3043
3044
3045
3046
3047
3048
3049
# File 'ext/RMagick/rmimage.c', line 3042

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


3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
# File 'ext/RMagick/rmimage.c', line 3058

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();
    TransformImageColorspace(image, new_cs, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    TransformImageColorspace(image, new_cs);
    rm_check_image_exception(image, RetainOnError);
#endif

    return colorspace;
}

#columnsNumeric

Get image columns.

Returns:

  • (Numeric)

    the columns


3089
3090
3091
3092
3093
# File 'ext/RMagick/rmimage.c', line 3089

VALUE
Image_columns(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, columns, int);
}

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

    If present a block, compare_channel yields to a block in which you can set optional arguments by setting attributes on self.

    • self.highlight_color = color

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

    • self.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) { ... } ⇒ Array

    If present a block, compare_channel yields to a block in which you can set optional arguments by setting attributes on self.

    • self.highlight_color = color

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

    • self.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.


3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
# File 'ext/RMagick/rmimage.c', line 3143

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);
    difference_image = CompareImages(image, r_image, metric_type, &distortion, exception);
    END_CHANNEL_MASK(image);
#else
    difference_image = CompareImageChannels(image, r_image, channels, metric_type, &distortion, exception);
#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;
}

#composeMagick::CompositeOperator

Return the composite operator attribute.

Returns:

  • (Magick::CompositeOperator)

    the composite operator


3200
3201
3202
3203
3204
3205
# File 'ext/RMagick/rmimage.c', line 3200

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


3214
3215
3216
3217
3218
3219
3220
# File 'ext/RMagick/rmimage.c', line 3214

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:


3483
3484
3485
3486
3487
# File 'ext/RMagick/rmimage.c', line 3483

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:


3443
3444
3445
3446
3447
# File 'ext/RMagick/rmimage.c', line 3443

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:


3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
# File 'ext/RMagick/rmimage.c', line 3497

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();
    DrawAffineImage(new_image, composite_image, &affine, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    DrawAffineImage(new_image, composite_image, &affine);
    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:


3631
3632
3633
3634
3635
# File 'ext/RMagick/rmimage.c', line 3631

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:


3706
3707
3708
3709
3710
# File 'ext/RMagick/rmimage.c', line 3706

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:


3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
# File 'ext/RMagick/rmimage.c', line 3754

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:


3919
3920
3921
3922
3923
# File 'ext/RMagick/rmimage.c', line 3919

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:


3946
3947
3948
3949
3950
# File 'ext/RMagick/rmimage.c', line 3946

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:


3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
# File 'ext/RMagick/rmimage.c', line 3986

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();
    okay = CompressImageColormap(image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    okay = CompressImageColormap(image);
    rm_check_image_exception(image, RetainOnError);
#endif
    if (!okay)
    {
        rb_warning("CompressImageColormap failed (probably DirectClass image)");
    }

    return self;
}

#compressionMagick::CompressionType

Get the compression attribute.

Returns:

  • (Magick::CompressionType)

    the compression


3958
3959
3960
3961
3962
3963
# File 'ext/RMagick/rmimage.c', line 3958

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


3971
3972
3973
3974
3975
3976
3977
# File 'ext/RMagick/rmimage.c', line 3971

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:


4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
# File 'ext/RMagick/rmimage.c', line 4194

VALUE
Image_contrast(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned int sharpen = 0;
#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 = RTEST(argv[0]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    ContrastImage(new_image, sharpen, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    ContrastImage(new_image, sharpen);
    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:


4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
# File 'ext/RMagick/rmimage.c', line 4317

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);
    ContrastStretchImage(new_image, black_point, white_point, exception);
    END_CHANNEL_MASK(new_image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    ContrastStretchImageChannel(new_image, channels, black_point, white_point);
    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:


4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
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
# File 'ext/RMagick/rmimage.c', line 4488

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

    image = rm_check_destroyed(self);

    order = NUM2INT(order_arg);

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

    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)
    new_image = ConvolveImage(image, kernel, exception);
    DestroyKernelInfo(kernel);
#else
    new_image = ConvolveImage(image, order, kernel, exception);
    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:


4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
# File 'ext/RMagick/rmimage.c', line 4566

VALUE
Image_convolve_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    VALUE ary;
    int 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);
    }

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

    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);
    new_image = ConvolveImage(image, kernel, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
    DestroyKernelInfo(kernel);
#else
    new_image = ConvolveImageChannel(image, channels, order, kernel, exception);
    xfree((void *)kernel);
#endif

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

    RB_GC_GUARD(ary);

    return rm_image_new(new_image);
}

#copyMagick::Image

Alias for #dup.

Returns:


4653
4654
4655
4656
4657
# File 'ext/RMagick/rmimage.c', line 4653

VALUE
Image_copy(VALUE self)
{
    return rb_funcall(self, rm_ID_dup, 0);
}

#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.

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:


4708
4709
4710
4711
4712
4713
# File 'ext/RMagick/rmimage.c', line 4708

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:


4744
4745
4746
4747
4748
4749
# File 'ext/RMagick/rmimage.c', line 4744

VALUE
Image_crop_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return cropper(True, argc, argv, self);
}

#cur_imageObject

Used by ImageList methods - see ImageList#cur_image


866
867
868
# File 'lib/rmagick_internal.rb', line 866

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:


4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
# File 'ext/RMagick/rmimage.c', line 4761

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();
    CycleColormapImage(new_image, amt, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    CycleColormapImage(new_image, amt);
    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:


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
# File 'ext/RMagick/rmimage.c', line 4902

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);

    okay = DecipherImage(new_image, pf, exception);
    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`


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
# File 'ext/RMagick/rmimage.c', line 4943

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;
}

#delayNumeric

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.


4980
4981
4982
4983
4984
# File 'ext/RMagick/rmimage.c', line 4980

VALUE
Image_delay(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, delay, ulong);
}

#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


4993
4994
4995
4996
4997
# File 'ext/RMagick/rmimage.c', line 4993

VALUE
Image_delay_eq(VALUE self, VALUE val)
{
    IMPLEMENT_ATTR_WRITER(Image, delay, ulong);
}

#delete_compose_maskMagick::Image

Delete the image composite mask.

Returns:

See Also:


5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
# File 'ext/RMagick/rmimage.c', line 5006

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();
    SetImageMask(image, CompositePixelMask, NULL, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageMask(image, NULL);
    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:


5038
5039
5040
5041
5042
5043
5044
5045
# File 'ext/RMagick/rmimage.c', line 5038

VALUE
Image_delete_profile(VALUE self, VALUE name)
{
    Image *image = rm_check_frozen(self);
    DeleteImageProfile(image, StringValueCStr(name));

    return self;
}

#densityString

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:


4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
# File 'ext/RMagick/rmimage.c', line 4796

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:


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
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
# File 'ext/RMagick/rmimage.c', line 4827

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;
}

#depthNumeric

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


5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
# File 'ext/RMagick/rmimage.c', line 5056

VALUE
Image_depth(VALUE self)
{
    Image *image;
    unsigned long depth = 0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    depth = GetImageDepth(image, exception);
    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:


5085
5086
5087
5088
5089
5090
5091
5092
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
# File 'ext/RMagick/rmimage.c', line 5085

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();
    new_image = DeskewImage(image, threshold, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#despeckleMagick::Image

Reduce the speckle noise in an image while preserving the edges of the original image.

Returns:


5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
# File 'ext/RMagick/rmimage.c', line 5126

VALUE
Image_despeckle(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    new_image = DespeckleImage(image, exception);
    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:


5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
# File 'ext/RMagick/rmimage.c', line 5148

VALUE
Image_destroy_bang(VALUE self)
{
    Image *image;

    rb_check_frozen(self);
    Data_Get_Struct(self, Image, 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


5166
5167
5168
5169
5170
5171
5172
5173
# File 'ext/RMagick/rmimage.c', line 5166

VALUE
Image_destroyed_q(VALUE self)
{
    Image *image;

    Data_Get_Struct(self, Image, 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.


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
# File 'ext/RMagick/rmimage.c', line 5193

VALUE
Image_difference(VALUE self, VALUE other)
{
    Image *image;
    Image *image2;
    VALUE mean, nmean, nmax;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    other = rm_cur_image(other);
    image2 = rm_check_destroyed(other);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    IsImagesEqual(image, image2, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    IsImagesEqual(image, image2);
    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);
}

#directoryString

Get image directory.

Returns:

  • (String)

    the directory


5234
5235
5236
5237
5238
# File 'ext/RMagick/rmimage.c', line 5234

VALUE
Image_directory(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, directory, str);
}

#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


5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
# File 'ext/RMagick/rmimage.c', line 5318

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;
    long 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();

    Data_Get_Struct(self, Image, image);

    exception = AcquireExceptionInfo();
    okay = ExportImagePixels(image, x, y, columns, rows, map, stg_type, (void *)pixels.v, exception);

    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:


5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
# File 'ext/RMagick/rmimage.c', line 5256

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);
}

#displayMagick::Image Also known as: __display__

Display the image to an X window screen.

Returns:


5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
# File 'ext/RMagick/rmimage.c', line 5406

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();
    Data_Get_Struct(info_obj, Info, 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;
}

#disposeMagick::DisposeType

Return the dispose attribute as a DisposeType enum.

Returns:

  • (Magick::DisposeType)

    the dispose


5447
5448
5449
5450
5451
5452
# File 'ext/RMagick/rmimage.c', line 5447

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


5461
5462
5463
5464
5465
5466
5467
# File 'ext/RMagick/rmimage.c', line 5461

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:


5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
# File 'ext/RMagick/rmimage.c', line 5493

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::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
  self.define "distort:viewport", "44x44+15+0"
  self.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::Image

    If present a block, distort yields to a block in which you can set optional arguments by setting attributes on self.

    • self.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.

    • self.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).

    • self.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:


5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
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
# File 'ext/RMagick/rmimage.c', line 5582

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 = 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();
    new_image = DistortImage(image, distortion_method, npoints, points, bestfit, exception);
    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


5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
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
# File 'ext/RMagick/rmimage.c', line 5657

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);
    difference_image = CompareImages(image, reconstruct, metric, &distortion, exception);
    END_CHANNEL_MASK(image);
    DestroyImage(difference_image);
#else
    GetImageChannelDistortion(image, reconstruct, channels, metric, &distortion, exception);
#endif

    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    RB_GC_GUARD(rec);

    return rb_float_new(distortion);
}

#dupMagick::Image

Duplicates a image.

Returns:


5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
# File 'ext/RMagick/rmimage.c', line 5771

VALUE
Image_dup(VALUE self)
{
    VALUE dup;

    rm_check_destroyed(self);
    dup = Data_Wrap_Struct(CLASS_OF(self), NULL, rm_image_destroy, NULL);
    RB_GC_GUARD(dup);

    return rb_funcall(dup, rm_ID_initialize_copy, 1, self);
}

#each_iptc_datasetObject

Iterate over IPTC record number:dataset tags, yield for each non-nil dataset


926
927
928
929
930
931
932
933
934
935
# File 'lib/rmagick_internal.rb', line 926

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_pixelObject

Thanks to Russell Norris!


871
872
873
874
875
876
# File 'lib/rmagick_internal.rb', line 871

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


5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
# File 'ext/RMagick/rmimage.c', line 5792

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:


5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
# File 'ext/RMagick/rmimage.c', line 5838

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();

    new_image = EdgeImage(image, radius, exception);
    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:


5922
5923
5924
5925
5926
# File 'ext/RMagick/rmimage.c', line 5922

VALUE
Image_emboss(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, 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:


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
# File 'ext/RMagick/rmimage.c', line 5937

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);

    okay = EncipherImage(new_image, pf, exception);
    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);
}

#endianMagick::EndianType

Return endian option for images that support it.

Returns:

  • (Magick::EndianType)

    the endian option


5971
5972
5973
5974
5975
5976
# File 'ext/RMagick/rmimage.c', line 5971

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


5985
5986
5987
5988
5989
5990
5991
# File 'ext/RMagick/rmimage.c', line 5985

VALUE
Image_endian_eq(VALUE self, VALUE type)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(type, image->endian, EndianType);
    return type;
}

#enhanceMagick::Image

Apply a digital filter that improves the quality of a noisy image.

Returns:


5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
# File 'ext/RMagick/rmimage.c', line 5998

VALUE
Image_enhance(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    new_image = EnhanceImage(image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#equalizeMagick::Image

Apply a histogram equalization to the image.

Returns:


6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
# File 'ext/RMagick/rmimage.c', line 6020

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();
    EqualizeImage(new_image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    EqualizeImage(new_image);
    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:


6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
# File 'ext/RMagick/rmimage.c', line 6056

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);
    EqualizeImage(new_image, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    EqualizeImageChannel(new_image, channels);

    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:


6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
# File 'ext/RMagick/rmimage.c', line 6096

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();
    SetImageBackgroundColor(image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageBackgroundColor(image);
    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:


6188
6189
6190
6191
6192
6193
# File 'ext/RMagick/rmimage.c', line 6188

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:


6213
6214
6215
6216
6217
6218
# File 'ext/RMagick/rmimage.c', line 6213

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


6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
# File 'ext/RMagick/rmimage.c', line 6238

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;
    unsigned int 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();

    okay = ExportImagePixels(image, x_off, y_off, cols, rows, map, QuantumPixel, (void *)pixels, exception);
    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


6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
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
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
# File 'ext/RMagick/rmimage.c', line 6401

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;
    unsigned int 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();

    okay = ExportImagePixels(image, x_off, y_off, cols, rows, map, type, (void *)RSTRING_PTR(string), exception);
    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:


6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
# File 'ext/RMagick/rmimage.c', line 6331

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);
        }
    }


    Data_Get_Struct(self, Image, image);
    exception = AcquireExceptionInfo();

    new_image = ExtentImage(image, &geometry, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#extract_infoMagick::Rectangle

The extract_info attribute reader.

Returns:

  • (Magick::Rectangle)

    the Rectangle object


6506
6507
6508
6509
6510
6511
# File 'ext/RMagick/rmimage.c', line 6506

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


6520
6521
6522
6523
6524
6525
6526
# File 'ext/RMagick/rmimage.c', line 6520

VALUE
Image_extract_info_eq(VALUE self, VALUE rect)
{
    Image *image = rm_check_frozen(self);
    Export_RectangleInfo(&image->extract_info, rect);
    return rect;
}

#filenameString

Get image filename.

Returns:

  • (String)

    the filename


6534
6535
6536
6537
6538
# File 'ext/RMagick/rmimage.c', line 6534

VALUE
Image_filename(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, filename, str);
}

#filesizeNumeric

Return the image file size.

Returns:

  • (Numeric)

    the file size


6546
6547
6548
6549
6550
# File 'ext/RMagick/rmimage.c', line 6546

VALUE Image_filesize(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return INT2FIX(GetBlobSize(image));
}

#filterMagick::FilterType

Get filter type.

Returns:

  • (Magick::FilterType)

    the filter


6558
6559
6560
6561
6562
6563
# File 'ext/RMagick/rmimage.c', line 6558

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


6572
6573
6574
6575
6576
6577
6578
# File 'ext/RMagick/rmimage.c', line 6572

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.


6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
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
# File 'ext/RMagick/rmimage.c', line 6597

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;
    unsigned int 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();
    okay = IsEquivalentImage(image, target, &x, &y, exception);
    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;
}

#flipMagick::Image

Create a vertical mirror image by reflecting the pixels around the central x-axis.

Returns:

See Also:


6691
6692
6693
6694
6695
6696
# File 'ext/RMagick/rmimage.c', line 6691

VALUE
Image_flip(VALUE self)
{
    rm_check_destroyed(self);
    return flipflop(False, self, 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:


6708
6709
6710
6711
6712
6713
# File 'ext/RMagick/rmimage.c', line 6708

VALUE
Image_flip_bang(VALUE self)
{
    rm_check_frozen(self);
    return flipflop(True, self, FlipImage);
}

#flopMagick::Image

Create a horizonal mirror image by reflecting the pixels around the central y-axis.

Returns:

See Also:


6724
6725
6726
6727
6728
6729
# File 'ext/RMagick/rmimage.c', line 6724

VALUE
Image_flop(VALUE self)
{
    rm_check_destroyed(self);
    return flipflop(False, self, 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:


6741
6742
6743
6744
6745
6746
# File 'ext/RMagick/rmimage.c', line 6741

VALUE
Image_flop_bang(VALUE self)
{
    rm_check_frozen(self);
    return flipflop(True, self, FlopImage);
}

#formatString?

Return the image encoding format. For example, “GIF” or “PNG”.

Returns:

  • (String, nil)

    the encoding format


6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
# File 'ext/RMagick/rmimage.c', line 6754

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


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
# File 'ext/RMagick/rmimage.c', line 6782

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:


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
# File 'ext/RMagick/rmimage.c', line 6824

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)
    new_image = FrameImage(image, &frame_info, image->compose, exception);
#else
    new_image = FrameImage(image, &frame_info, exception);
#endif
    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:


6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
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
# File 'ext/RMagick/rmimage.c', line 6942

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);
    FunctionImage(new_image, function, nparms, parms, exception);
    END_CHANNEL_MASK(new_image);
#else
    FunctionImageChannel(new_image, channels, function, nparms, parms, exception);
#endif
    xfree(parms);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#fuzzFloat

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:


7028
7029
7030
7031
7032
# File 'ext/RMagick/rmimage.c', line 7028

VALUE
Image_fuzz(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, fuzz, dbl);
}

#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:


7043
7044
7045
7046
7047
7048
7049
# File 'ext/RMagick/rmimage.c', line 7043

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:


7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
# File 'ext/RMagick/rmimage.c', line 7065

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);
    new_image = FxImage(image, expression, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = FxImageChannel(image, channels, expression, exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#gammaFloat

Get the gamma level of the image.

Returns:

  • (Float)

    the gamma level


7108
7109
7110
7111
7112
# File 'ext/RMagick/rmimage.c', line 7108

VALUE
Image_gamma(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, gamma, dbl);
}

#gamma=(val) ⇒ Float

Set the gamma level of the image.

Parameters:

  • val (Float)

    the gamma level

Returns:

  • (Float)

    the gamma level


7120
7121
7122
7123
7124
# File 'ext/RMagick/rmimage.c', line 7120

VALUE
Image_gamma_eq(VALUE self, VALUE val)
{
    IMPLEMENT_ATTR_WRITER(Image, gamma, dbl);
}

#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:


7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
# File 'ext/RMagick/rmimage.c', line 7142

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);
    GammaImage(new_image, gamma, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GammaImageChannel(new_image, channels, gamma);
    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:


7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
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
7265
7266
7267
# File 'ext/RMagick/rmimage.c', line 7190

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));
        GammaImage(new_image, red_gamma, exception);
        END_CHANNEL_MASK(new_image);
#else
        GammaImageChannel(new_image, (ChannelType) (RedChannel | GreenChannel | BlueChannel), red_gamma);
#endif
    }
    else
    {
#if defined(IMAGEMAGICK_7)
        BEGIN_CHANNEL_MASK(new_image, RedChannel);
        GammaImage(new_image, red_gamma, exception);
        END_CHANNEL_MASK(new_image);

        BEGIN_CHANNEL_MASK(new_image, GreenChannel);
        GammaImage(new_image, green_gamma, exception);
        END_CHANNEL_MASK(new_image);

        BEGIN_CHANNEL_MASK(new_image, BlueChannel);
        GammaImage(new_image, blue_gamma, exception);
        END_CHANNEL_MASK(new_image);
#else
        GammaImageChannel(new_image, RedChannel, red_gamma);
        GammaImageChannel(new_image, GreenChannel, green_gamma);
        GammaImageChannel(new_image, BlueChannel, blue_gamma);
#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:


7278
7279
7280
7281
7282
# File 'ext/RMagick/rmimage.c', line 7278

VALUE
Image_gaussian_blur(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, 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:


7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
# File 'ext/RMagick/rmimage.c', line 7300

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);
    new_image = GaussianBlurImage(image, radius, sigma, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
    rm_check_exception(exception, new_image, DestroyOnError);
#else
    new_image = GaussianBlurImageChannel(image, channels, radius, sigma, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
#endif

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#geometryString

Get the preferred size of the image when encoding.

Returns:

  • (String)

    the geometry

See Also:


7350
7351
7352
7353
7354
# File 'ext/RMagick/rmimage.c', line 7350

VALUE
Image_geometry(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, geometry, str);
}

#geometry=(geometry) ⇒ String

Set the preferred size of the image when encoding.

Parameters:

  • geometry (String)

    the geometry

Returns:

  • (String)

    the given geometry

See Also:


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
# File 'ext/RMagick/rmimage.c', line 7364

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.


882
883
884
885
886
887
888
889
890
891
892
893
894
895
# File 'lib/rmagick_internal.rb', line 882

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.


898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
# File 'lib/rmagick_internal.rb', line 898

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.


921
922
923
# File 'lib/rmagick_internal.rb', line 921

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:


7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
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
# File 'ext/RMagick/rmimage.c', line 7406

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();
    pixels = GetVirtualPixels(image, x, y, columns, rows, exception);
    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;
}

#gravityMagick::GravityType

Get the direction that the image gravitates within the composite.

Returns:

  • (Magick::GravityType)

    the image gravity


14437
14438
14439
14440
14441
# File 'ext/RMagick/rmimage.c', line 14437

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


14450
14451
14452
14453
14454
14455
# File 'ext/RMagick/rmimage.c', line 14450

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


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
# File 'ext/RMagick/rmimage.c', line 7545

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


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
# File 'ext/RMagick/rmimage.c', line 7545

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


7580
7581
7582
7583
7584
# File 'ext/RMagick/rmimage.c', line 7580

VALUE
Image_histogram_q(VALUE self)
{
    return has_attribute(self, IsHistogramImage);
}

#image_typeMagick::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


14465
14466
14467
14468
14469
14470
14471
14472
14473
14474
14475
14476
14477
14478
14479
14480
14481
14482
14483
14484
14485
# File 'ext/RMagick/rmimage.c', line 14465

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


14494
14495
14496
14497
14498
14499
14500
14501
14502
14503
14504
14505
14506
14507
14508
14509
14510
14511
14512
14513
# File 'ext/RMagick/rmimage.c', line 14494

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:


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
# File 'ext/RMagick/rmimage.c', line 7593

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)
    new_image = ImplodeImage(image, amount, image->interpolate, exception);
#else
    new_image = ImplodeImage(image, amount, exception);
#endif
    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:


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
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
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
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
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
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
# File 'ext/RMagick/rmimage.c', line 7642

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;
    long 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;
    unsigned int 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();
    okay = ImportImagePixels(image, x_off, y_off, cols, rows, map, stg_type, buffer, exception);
#else
    okay = ImportImagePixels(image, x_off, y_off, cols, rows, map, stg_type, buffer);
#endif

    // 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:


4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
# File 'ext/RMagick/rmimage.c', line 4668

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;
}

#inspectString

Override Object#inspect - return a string description of the image.

Returns:

  • (String)

    the string


7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
# File 'ext/RMagick/rmimage.c', line 7978

VALUE
Image_inspect(VALUE self)
{
    Image *image;
    char buffer[MaxTextExtent];          // image description buffer

    Data_Get_Struct(self, Image, image);
    if (!image)
    {
        return rb_str_new2("#<Magick::Image: (destroyed)>");
    }
    build_inspect_string(image, buffer, sizeof(buffer));
    return rb_str_new2(buffer);
}

#interlaceMagick::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


8004
8005
8006
8007
8008
8009
# File 'ext/RMagick/rmimage.c', line 8004

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


8018
8019
8020
8021
8022
8023
8024
# File 'ext/RMagick/rmimage.c', line 8018

VALUE
Image_interlace_eq(VALUE self, VALUE interlace)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(interlace, image->interlace, InterlaceType);
    return interlace;
}

#iptc_profileString?

Return the IPTC profile as a String.

Returns:

  • (String, nil)

    the IPTC profile if it exists, otherwise nil


8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
# File 'ext/RMagick/rmimage.c', line 8032

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


8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
# File 'ext/RMagick/rmimage.c', line 8057

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;
}

#iterationsObject

These are undocumented methods. The writer is called only by Image#iterations=. The reader is only used by the unit tests!


8074
8075
8076
8077
8078
# File 'ext/RMagick/rmimage.c', line 8074

VALUE
Image_iterations(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, iterations, int);
}

#iterations=(val) ⇒ Object

do not document! Only used by Image#iterations=


8079
8080
8081
8082
8083
# File 'ext/RMagick/rmimage.c', line 8079

VALUE
Image_iterations_eq(VALUE self, VALUE val)
{
    IMPLEMENT_ATTR_WRITER(Image, iterations, int);
}

#level(black_point = 0.0, white_point = nil, gamma = nil) ⇒ Object

(Thanks to Al Evans for the suggestion.)


950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
# File 'lib/rmagick_internal.rb', line 950

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:


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
# File 'ext/RMagick/rmimage.c', line 8095

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();
    LevelImage(new_image, black_point, white_point, gamma_val, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    snprintf(level, sizeof(level), "%gx%g+%g", black_point, white_point, gamma_val);
    LevelImage(new_image, level);
    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:


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
# File 'ext/RMagick/rmimage.c', line 8157

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);
    LevelImage(new_image, black_point, white_point, gamma_val, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    LevelImageChannel(new_image, channel, black_point, white_point, gamma_val);
    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:


8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
# File 'ext/RMagick/rmimage.c', line 8229

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 status;
#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 = 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);
    status = LevelImageColors(new_image, &black_color, &white_color, invert, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    status = LevelColorsImageChannel(new_image, channels, &black_color, &white_color, invert);
    rm_check_image_exception(new_image, DestroyOnError);
#endif
    if (!status)
    {
        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:


8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
# File 'ext/RMagick/rmimage.c', line 8312

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 status;
#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);
    status = LevelizeImage(new_image, black_point, white_point, gamma, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    status = LevelizeImageChannel(new_image, channels, black_point, white_point, gamma);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    if (!status)
    {
        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:


8384
8385
8386
8387
8388
8389
8390
8391
8392
8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
8407
8408
# File 'ext/RMagick/rmimage.c', line 8384

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();
    LinearStretchImage(new_image, black_point, white_point, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    LinearStretchImage(new_image, black_point, white_point);
    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:


8422
8423
8424
8425
8426
8427
8428
8429
8430
8431
8432
8433
8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
# File 'ext/RMagick/rmimage.c', line 8422

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();
    new_image = LiquidRescaleImage(image, cols, rows, delta_x, rigidity, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#magnifyMagick::Image

Scale an image proportionally to twice its size.

Returns:

See Also:


8570
8571
8572
8573
8574
8575
# File 'ext/RMagick/rmimage.c', line 8570

VALUE
Image_magnify(VALUE self)
{
    rm_check_destroyed(self);
    return magnify(False, self, MagnifyImage);
}

#magnify!Magick::Image

Scale an image proportionally to twice its size. In-place form of #magnify.

Returns:

See Also:


8585
8586
8587
8588
8589
8590
# File 'ext/RMagick/rmimage.c', line 8585

VALUE
Image_magnify_bang(VALUE self)
{
    rm_check_frozen(self);
    return magnify(True, self, MagnifyImage);
}

#marshal_dumpArray<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.


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
8627
8628
8629
8630
8631
8632
# File 'ext/RMagick/rmimage.c', line 8599

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();
    blob = ImageToBlob(info, image, &length, exception);

    // 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


8641
8642
8643
8644
8645
8646
8647
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
# File 'ext/RMagick/rmimage.c', line 8641

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));
    }
    image = BlobToImage(info, RSTRING_PTR(blob), RSTRING_LEN(blob), exception);

    // Destroy info before raising an exception
    DestroyImageInfo(info);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    UPDATE_DATA_PTR(self, image);

    return self;
}

#maskMagick::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:


8862
8863
8864
8865
8866
8867
8868
8869
8870
8871
8872
8873
8874
8875
8876
8877
8878
8879
8880
8881
# File 'ext/RMagick/rmimage.c', line 8862

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_colorString

Return the matte color.

Returns:

  • (String)

    the matte color


8889
8890
8891
8892
8893
8894
# File 'ext/RMagick/rmimage.c', line 8889

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:


8902
8903
8904
8905
8906
8907
8908
# File 'ext/RMagick/rmimage.c', line 8902

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.


1001
1002
1003
1004
1005
# File 'lib/rmagick_internal.rb', line 1001

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

#ImageMagick::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:


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
8956
8957
8958
8959
8960
8961
8962
8963
8964
8965
8966
8967
8968
8969
8970
8971
8972
8973
8974
8975
8976
8977
8978
8979
8980
8981
8982
8983
8984
8985
8986
8987
8988
8989
8990
8991
8992
8993
8994
8995
8996
8997
8998
8999
9000
9001
9002
9003
9004
9005
9006
9007
# File 'ext/RMagick/rmimage.c', line 8922

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)
    draw_info->fill.alpha = 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;
    }
    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();
    BEGIN_CHANNEL_MASK(new_image, OpacityChannel);
    FloodfillPaintImage(new_image, draw_info, &target_mpp, x, y, invert, exception);
    END_CHANNEL_MASK(new_image);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    FloodfillPaintImage(new_image, OpacityChannel, draw_info, &target_mpp, x, y, invert);
    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.


993
994
995
996
997
998
# File 'lib/rmagick_internal.rb', line 993

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.


973
974
975
976
977
978
979
980
# File 'lib/rmagick_internal.rb', line 973

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).


984
985
986
987
988
989
# File 'lib/rmagick_internal.rb', line 984

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.


1008
1009
1010
1011
# File 'lib/rmagick_internal.rb', line 1008

def matte_reset!
  alpha(TransparentAlphaChannel)
  self
end

#mean_error_per_pixelFloat

Get the mean error per pixel computed when a image is color reduced.

Returns:

  • (Float)

    the mean error per pixel


9051
9052
9053
9054
9055
# File 'ext/RMagick/rmimage.c', line 9051

VALUE
Image_mean_error_per_pixel(VALUE self)
{
    IMPLEMENT_ATTR_READERF(Image, mean_error_per_pixel, error.mean_error_per_pixel, dbl);
}

#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:


9018
9019
9020
9021
9022
9023
9024
9025
9026
9027
9028
9029
9030
9031
9032
9033
9034
9035
9036
9037
9038
9039
9040
9041
9042
9043
# File 'ext/RMagick/rmimage.c', line 9018

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();
    new_image = StatisticImage(image, MedianStatistic, (size_t)radius, (size_t)radius, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#mime_typeString?

Return the officially registered (or de facto) MIME media-type corresponding to the image format.

Returns:

  • (String, nil)

    the mime type


9063
9064
9065
9066
9067
9068
9069
9070
9071
9072
9073
9074
9075
9076
9077
9078
9079
9080
9081
9082
9083
9084
# File 'ext/RMagick/rmimage.c', line 9063

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;
}

#minifyMagick::Image

Scale an image proportionally to half its size.

Returns:

See Also:


9093
9094
9095
9096
9097
9098
# File 'ext/RMagick/rmimage.c', line 9093

VALUE
Image_minify(VALUE self)
{
    rm_check_destroyed(self);
    return magnify(False, self, MinifyImage);
}

#minify!Magick::Image

Scale an image proportionally to half its size. In-place form of #minify.

Returns:

See Also:


9107
9108
9109
9110
9111
9112
# File 'ext/RMagick/rmimage.c', line 9107

VALUE
Image_minify_bang(VALUE self)
{
    rm_check_frozen(self);
    return magnify(True, self, 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:


9124
9125
9126
9127
9128
9129
9130
9131
9132
9133
9134
9135
9136
9137
9138
9139
9140
9141
9142
9143
9144
9145
9146
9147
9148
9149
9150
9151
9152
9153
9154
9155
9156
9157
9158
9159
9160
9161
9162
9163
9164
9165
9166
9167
9168
9169
9170
9171
9172
# File 'ext/RMagick/rmimage.c', line 9124

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();
    ModulateImage(new_image, modulate, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    ModulateImage(new_image, modulate);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#monitor=(monitor) ⇒ Proc

Establish a progress monitor.

  • A progress monitor is a callable object. Save the monitor proc as the client_data and establish `progress_monitor' as the monitor exit. When `progress_monitor' is called, retrieve the proc and call it.

Examples:

img.monitor = Proc.new do |method, offset, span|
  print "%s is %3.0f%% complete.\n", method, (offset.to_f/span)*100)
  true
end

Parameters:

  • monitor (Proc)

    the progress monitor

Returns:

  • (Proc)

    the given value


9190
9191
9192
9193
9194
9195
9196
9197
9198
9199
9200
9201
9202
9203
9204
9205
# File 'ext/RMagick/rmimage.c', line 9190

VALUE
Image_monitor_eq(VALUE self, VALUE monitor)
{
    Image *image = rm_check_frozen(self);

    if (NIL_P(monitor))
    {
        image->progress_monitor = NULL;
    }
    else
    {
        SetImageProgressMonitor(image, rm_progress_monitor, (void *)monitor);
    }

    return monitor;
}

#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


9214
9215
9216
9217
9218
9219
9220
9221
9222
# File 'ext/RMagick/rmimage.c', line 9214

VALUE
Image_monochrome_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
    return has_image_attribute(self, IsImageMonochrome);
#else
    return has_attribute(self, IsMonochromeImage);
#endif
}

#montageString

Tile size and offset within an image montage. Only valid for montage images.

Returns:

  • (String)

    the tile size and offset


9230
9231
9232
9233
9234
# File 'ext/RMagick/rmimage.c', line 9230

VALUE
Image_montage(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, montage, str);
}

#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:


4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
# File 'ext/RMagick/rmimage.c', line 4365

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:


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
# File 'ext/RMagick/rmimage.c', line 4391

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");
    }

    Data_Get_Struct(kernel_v, KernelInfo, kernel);

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channel);
    new_image = MorphologyImage(image, method, NUM2LONG(iterations), kernel, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = MorphologyImageChannel(image, channel, method, NUM2LONG(iterations), kernel, exception);
#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:


9303
9304
9305
9306
9307
9308
# File 'ext/RMagick/rmimage.c', line 9303

VALUE
Image_motion_blur(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return motion_blur(argc, argv, self, 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:


9319
9320
9321
9322
9323
9324
9325
9326
9327
9328
9329
9330
9331
9332
9333
9334
9335
9336
9337
9338
9339
9340
9341
9342
9343
9344
9345
9346
9347
9348
9349
9350
9351
# File 'ext/RMagick/rmimage.c', line 9319

VALUE
Image_negate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned int grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    if (argc == 1)
    {
        grayscale = 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();
    NegateImage(new_image, grayscale, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    NegateImage(new_image, grayscale);
    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:


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
# File 'ext/RMagick/rmimage.c', line 9371

VALUE
Image_negate_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    unsigned int 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 = RTEST(argv[0]);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, channels);
    NegateImage(new_image, grayscale, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    NegateImageChannel(new_image, channels, grayscale);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#normalizeMagick::Image

Enhance the contrast of a color image by adjusting the pixels color to span the entire range of colors available.

Returns:


9544
9545
9546
9547
9548
9549
9550
9551
9552
9553
9554
9555
9556
9557
9558
9559
9560
9561
9562
9563
9564
9565
9566
# File 'ext/RMagick/rmimage.c', line 9544

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();
    NormalizeImage(new_image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    NormalizeImage(new_image);
    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:


9577
9578
9579
9580
9581
9582
9583
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
# File 'ext/RMagick/rmimage.c', line 9577

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);
    NormalizeImage(new_image, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    NormalizeImageChannel(new_image, channels);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#normalized_maximum_errorFloat

Get The normalized maximum error per pixel computed when an image is color reduced.

Returns:

  • (Float)

    the normalized maximum error


9628
9629
9630
9631
9632
# File 'ext/RMagick/rmimage.c', line 9628

VALUE
Image_normalized_maximum_error(VALUE self)
{
    IMPLEMENT_ATTR_READERF(Image, normalized_maximum_error, error.normalized_maximum_error, dbl);
}

#normalized_mean_errorFloat

Get the normalized mean error per pixel computed when an image is color reduced.

Returns:

  • (Float)

    the normalized mean error


9617
9618
9619
9620
9621
# File 'ext/RMagick/rmimage.c', line 9617

VALUE
Image_normalized_mean_error(VALUE self)
{
    IMPLEMENT_ATTR_READERF(Image, normalized_mean_error, error.normalized_mean_error, dbl);
}

#number_colorsNumeric

Return the number of unique colors in the image.

Returns:

  • (Numeric)

    number of unique colors


9640
9641
9642
9643
9644
9645
9646
9647
9648
9649
9650
9651
9652
9653
9654
9655
9656
# File 'ext/RMagick/rmimage.c', line 9640

VALUE
Image_number_colors(VALUE self)
{
    Image *image;
    ExceptionInfo *exception;
    unsigned long n = 0;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    n = (unsigned long) GetNumberColors(image, NULL, exception);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return ULONG2NUM(n);
}

#offsetNumber

Get the number of bytes to skip over when reading raw image.

Returns:

  • (Number)

    the offset


9664
9665
9666
9667
9668
# File 'ext/RMagick/rmimage.c', line 9664

VALUE
Image_offset(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, offset, long);
}

#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


9676
9677
9678
9679
9680
# File 'ext/RMagick/rmimage.c', line 9676

VALUE
Image_offset_eq(VALUE self, VALUE val)
{
    IMPLEMENT_ATTR_WRITER(Image, offset, long);
}

#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:


9690
9691
9692
9693
9694
9695
9696
9697
9698
9699
9700
9701
9702
9703
9704
9705
9706
9707
9708
9709
9710
9711
9712
9713
9714
9715
9716
9717
9718
9719
9720
9721
9722
9723
# File 'ext/RMagick/rmimage.c', line 9690

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)
    new_image = OilPaintImage(image, radius, sigma, exception);
#else
    new_image = OilPaintImage(image, radius, exception);
#endif
    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:


9738
9739
9740
9741
9742
9743
9744
9745
9746
9747
9748
9749
9750
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
# File 'ext/RMagick/rmimage.c', line 9738

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();
    okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, MagickFalse, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    okay = OpaquePaintImageChannel(new_image, DefaultChannels, &target_pp, &fill_pp, MagickFalse);
    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


9877
9878
9879
9880
9881
9882
9883
9884
9885
# File 'ext/RMagick/rmimage.c', line 9877

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:


9800
9801
9802
9803
9804
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
9846
9847
9848
9849
9850
9851
9852
9853
9854
9855
9856
9857
9858
9859
9860
9861
9862
9863
9864
9865
9866
9867
9868
9869
# File 'ext/RMagick/rmimage.c', line 9800

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 = 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);
    okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, invert, exception);
    END_CHANNEL_MASK(new_image);
    new_image->fuzz = keep;
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    okay = OpaquePaintImageChannel(new_image, channels, &target_pp, &fill_pp, invert);

    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:


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
# File 'ext/RMagick/rmimage.c', line 9898

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();

    OrderedDitherImage(new_image, threshold_map, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#orientationMagick::OrientationType

Get the value of the Exif Orientation Tag.

Returns:

  • (Magick::OrientationType)

    the orientation


9954
9955
9956
9957
9958
9959
# File 'ext/RMagick/rmimage.c', line 9954

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


9968
9969
9970
9971
9972
9973
9974
# File 'ext/RMagick/rmimage.c', line 9968

VALUE
Image_orientation_eq(VALUE self, VALUE orientation)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(orientation, image->orientation, OrientationType);
    return orientation;
}

#pageMagick::Rectang

The page attribute getter.

Returns:

  • (Magick::Rectang)

    the page rectangle


9982
9983
9984
9985
9986
9987
# File 'ext/RMagick/rmimage.c', line 9982

VALUE
Image_page(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return Import_RectangleInfo(&image->page);
}

#page=(rect) ⇒ Magick::Rectang

The page attribute setter.

Parameters:

  • rect (Magick::Rectang)

    the page rectangle

Returns:

  • (Magick::Rectang)

    the given value


9996
9997
9998
9999
10000
10001
10002
# File 'ext/RMagick/rmimage.c', line 9996

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:


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
10052
10053
10054
10055
10056
10057
10058
10059
10060
10061
10062
10063
10064
10065
10066
10067
10068
10069
10070
10071
10072
10073
10074
10075
10076
10077
10078
10079
10080
10081
10082
10083
10084
10085
10086
10087
10088
10089
10090
10091
10092
10093
10094
10095
# File 'ext/RMagick/rmimage.c', line 10019

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 = RTEST(argv[1]);
            }
            else
            {
                invert = 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();
    okay = TransparentPaintImage(new_image, (const MagickPixel *)&color, alpha, invert, exception);
    new_image->fuzz = keep;
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    okay = TransparentPaintImage(new_image, (const MagickPixel *)&color, QuantumRange - alpha, invert);
    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


10103
10104
10105
10106
10107
10108
10109
10110
10111
# File 'ext/RMagick/rmimage.c', line 10103

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:


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
10168
10169
10170
10171
10172
10173
10174
10175
10176
10177
10178
10179
10180
10181
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
10224
10225
10226
10227
10228
10229
10230
10231
10232
10233
10234
10235
10236
10237
10238
10239
10240
10241
10242
10243
10244
10245
10246
10247
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
# File 'ext/RMagick/rmimage.c', line 10143

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();
        old_pixel = GetVirtualPixels(image, x, y, 1, 1, exception);
        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)
        okay = SetImageStorageClass(image, DirectClass, exception);
        CHECK_EXCEPTION();
        if (!okay)
        {
            DestroyExceptionInfo(exception);
            rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
        }
#else
        okay = SetImageStorageClass(image, DirectClass);
        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

    pixel = GetAuthenticPixels(image, x, y, 1, 1, exception);
    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

        SyncAuthenticPixels(image, exception);
        CHECK_EXCEPTION();
    }

    DestroyExceptionInfo(exception);

    return Pixel_from_PixelPacket(&old_color);
}

#pixel_interpolation_methodMagick::PixelInterpolateMethod

Get the “interpolate” field.

Returns:

  • (Magick::PixelInterpolateMethod)

    the interpolate field

See Also:


10313
10314
10315
10316
10317
10318
# File 'ext/RMagick/rmimage.c', line 10313

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:


10328
10329
10330
10331
10332
10333
10334
# File 'ext/RMagick/rmimage.c', line 10328

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

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

    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 self.shadow_color. To specify a different border color (that is, the color of the image border) use self.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:


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
10405
10406
10407
# File 'ext/RMagick/rmimage.c', line 10360

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();
    Data_Get_Struct(options, Draw, 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);
    new_image = PolaroidImage(clone, draw->info, caption, angle, image->interpolate, exception);
#else
    new_image = PolaroidImage(clone, draw->info, angle, exception);
#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


10418
10419
10420
10421
10422
10423
10424
10425
10426
10427
10428
10429
10430
10431
10432
10433
10434
10435
10436
10437
10438
10439
10440
10441
10442
10443
10444
10445
10446
10447
10448
10449
10450
10451
10452
10453
10454
10455
10456
10457
10458
# File 'ext/RMagick/rmimage.c', line 10418

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;
    PosterizeImage(new_image, levels, dither_method, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    PosterizeImage(new_image, levels, dither);
    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:


10468
10469
10470
10471
10472
10473
10474
10475
10476
10477
10478
10479
10480
10481
10482
10483
10484
10485
# File 'ext/RMagick/rmimage.c', line 10468

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();
    new_image = PreviewImage(image, preview_type, exception);
    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:


10496
10497
10498
10499
10500
10501
10502
10503
10504
10505
10506
10507
10508
10509
# File 'ext/RMagick/rmimage.c', line 10496

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);
    }

}

#propertiesHash #properties { ... } ⇒ 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:

  • #propertiesHash

    Returns the properties.

    Returns:

    • (Hash)

      the properties

  • #properties { ... } ⇒ Magick::Image

    Returns self.

    Yields:

    Returns:


12328
12329
12330
12331
12332
12333
12334
12335
12336
12337
12338
12339
12340
12341
12342
12343
12344
12345
12346
12347
12348
12349
12350
12351
12352
12353
12354
12355
12356
12357
12358
12359
12360
12361
12362
12363
12364
12365
12366
12367
12368
12369
12370
12371
12372
12373
12374
12375
12376
12377
12378
12379
12380
12381
12382
12383
12384
12385
12386
12387
12388
12389
12390
12391
12392
12393
12394
12395
12396
12397
12398
12399
12400
12401
12402
# File 'ext/RMagick/rmimage.c', line 12328

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;
    }

}

#qualityNumeric

Get image quality.

Returns:

  • (Numeric)

    the quality


10517
10518
10519
10520
10521
# File 'ext/RMagick/rmimage.c', line 10517

VALUE
Image_quality(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, quality, ulong);
}

#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:


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
10776
10777
10778
10779
10780
10781
10782
10783
10784
10785
10786
10787
10788
10789
10790
10791
10792
10793
10794
10795
# File 'ext/RMagick/rmimage.c', line 10737

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 = 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();
    QuantizeImage(&quantize_info, new_image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    QuantizeImage(&quantize_info, new_image);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#quantum_depthNumeric

Return the image depth to the nearest Quantum (8, 16, or 32).

Returns:

  • (Numeric)

    image depth


10529
10530
10531
10532
10533
10534
10535
10536
10537
10538
10539
# File 'ext/RMagick/rmimage.c', line 10529

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(operator, rvalue, channel = Magick::AllChannels) ⇒ Magick::Image #quantum_operator(operator, 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(operator, rvalue, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • operator (Magick::QuantumExpressionOperator)

      the operator

    • rvalue (Float)

      the operation rvalue.

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

      a ChannelType arguments.

  • #quantum_operator(operator, rvalue, *channels) ⇒ Magick::Image

    Parameters:

    • operator (Magick::QuantumExpressionOperator)

      the operator

    • rvalue (Float)

      the operation rvalue.

    • *channels (Magick::ChannelType)

      one or more ChannelType arguments.

Returns:


10562
10563
10564
10565
10566
10567
10568
10569
10570
10571
10572
10573
10574
10575
10576
10577
10578
10579
10580
10581
10582
10583
10584
10585
10586
10587
10588
10589
10590
10591
10592
10593
10594
10595
10596
10597
10598
10599
10600
10601
10602
10603
10604
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
# File 'ext/RMagick/rmimage.c', line 10562

VALUE
Image_quantum_operator(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    QuantumExpressionOperator operator;
    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], operator, QuantumExpressionOperator);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    // Map QuantumExpressionOperator to MagickEvaluateOperator
    switch (operator)
    {
        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);
    EvaluateImage(image, qop, rvalue, exception);
    END_CHANNEL_MASK(image);
#else
    EvaluateImageChannel(image, channel, qop, rvalue, exception);
#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:


10804
10805
10806
10807
10808
10809
10810
10811
10812
10813
10814
10815
10816
10817
10818
10819
10820
10821
10822
10823
# File 'ext/RMagick/rmimage.c', line 10804

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)
    new_image = RotationalBlurImage(image, angle, exception);
#else
    new_image = RadialBlurImage(image, angle, exception);
#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:


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
# File 'ext/RMagick/rmimage.c', line 10839

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);
    new_image = RotationalBlurImage(image, angle, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#elif defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
    new_image = RotationalBlurImageChannel(image, channels, angle, exception);
#else
    new_image = RadialBlurImageChannel(image, channels, angle, exception);
#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:


10959
10960
10961
10962
10963
10964
10965
10966
10967
10968
10969
10970
10971
10972
10973
10974
10975
10976
10977
10978
10979
10980
10981
10982
10983
10984
10985
10986
10987
10988
10989
10990
10991
10992
10993
10994
10995
10996
10997
10998
10999
11000
11001
11002
# File 'ext/RMagick/rmimage.c', line 10959

VALUE
Image_raise(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    RectangleInfo rect;
    int 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 = 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();
    RaiseImage(new_image, &rect, raised, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    RaiseImage(new_image, &rect, raised);
    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:


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
10934
10935
10936
10937
10938
10939
10940
10941
10942
10943
10944
10945
# File 'ext/RMagick/rmimage.c', line 10895

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);
        RandomThresholdImage(new_image, geometry_info.rho, geometry_info.sigma, exception);
    }
    END_CHANNEL_MASK(new_image);
#else
    RandomThresholdImageChannel(new_image, channels, thresholds, exception);
#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:


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
11195
11196
11197
11198
11199
11200
11201
11202
11203
11204
# File 'ext/RMagick/rmimage.c', line 11137

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;

    new_image = ColorMatrixImage(image, kernel_info, exception);
    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:


11307
11308
11309
11310
11311
11312
11313
11314
11315
11316
11317
11318
11319
11320
11321
11322
11323
# File 'ext/RMagick/rmimage.c', line 11307

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();
    new_image = StatisticImage(image, NonpeakStatistic, radius_size, radius_size, exception);
    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


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
11365
11366
11367
11368
11369
11370
11371
11372
11373
11374
11375
11376
11377
11378
# File 'ext/RMagick/rmimage.c', line 11337

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();
    RemapImage(&quantize_info, image, remap_image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    RemapImage(&quantize_info, image, remap_image);
    rm_check_image_exception(image, RetainOnError);
#endif

    return self;
}

#rendering_intentMagick::RenderingIntent

Get the type of rendering intent.

Returns:

  • (Magick::RenderingIntent)

    the rendering intent


11386
11387
11388
11389
11390
11391
# File 'ext/RMagick/rmimage.c', line 11386

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


11400
11401
11402
11403
11404
11405
11406
# File 'ext/RMagick/rmimage.c', line 11400

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:


11563
11564
11565
11566
11567
11568
# File 'ext/RMagick/rmimage.c', line 11563

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:


11583
11584
11585
11586
11587
11588
# File 'ext/RMagick/rmimage.c', line 11583

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:


11701
11702
11703
11704
11705
11706
# File 'ext/RMagick/rmimage.c', line 11701

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:


11727
11728
11729
11730
11731
11732
# File 'ext/RMagick/rmimage.c', line 11727

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!)


1015
1016
1017
# File 'lib/rmagick_internal.rb', line 1015

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!


1019
1020
1021
1022
1023
1024
1025
1026
1027
# File 'lib/rmagick_internal.rb', line 1019

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!)


1035
1036
1037
1038
1039
1040
# File 'lib/rmagick_internal.rb', line 1035

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


1042
1043
1044
1045
1046
1047
# File 'lib/rmagick_internal.rb', line 1042

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:


11742
11743
11744
11745
11746
11747
11748
11749
11750
11751
11752
11753
11754
11755
11756
11757
11758
# File 'ext/RMagick/rmimage.c', line 11742

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();
    new_image = RollImage(image, x, y, exception);
    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:


11844
11845
11846
11847
11848
11849
# File 'ext/RMagick/rmimage.c', line 11844

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:


11868
11869
11870
11871
11872
11873
# File 'ext/RMagick/rmimage.c', line 11868

VALUE
Image_rotate_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return rotate(True, argc, argv, self);
}

#rowsNumeric

Return image rows.

Returns:

  • (Numeric)

    the image rows


11881
11882
11883
11884
11885
# File 'ext/RMagick/rmimage.c', line 11881

VALUE
Image_rows(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, rows, int);
}

#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:


11904
11905
11906
11907
11908
11909
# File 'ext/RMagick/rmimage.c', line 11904

VALUE
Image_sample(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return scale(False, argc, argv, self, 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:


11928
11929
11930
11931
11932
11933
# File 'ext/RMagick/rmimage.c', line 11928

VALUE
Image_sample_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return scale(True, argc, argv, self, 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:


11952
11953
11954
11955
11956
11957
# File 'ext/RMagick/rmimage.c', line 11952

VALUE
Image_scale(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return scale(False, argc, argv, self, 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:


11976
11977
11978
11979
11980
11981
# File 'ext/RMagick/rmimage.c', line 11976

VALUE
Image_scale_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return scale(True, argc, argv, self, ScaleImage);
}

#sceneNumeric

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


12067
12068
12069
12070
12071
# File 'ext/RMagick/rmimage.c', line 12067

VALUE
Image_scene(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, scene, ulong);
}

#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:


12269
12270
12271
12272
12273
12274
12275
12276
12277
12278
12279
12280
12281
12282
12283
12284
12285
12286
12287
12288
12289
12290
12291
12292
12293
12294
12295
12296
12297
12298
12299
12300
12301
12302
12303
12304
12305
12306
12307
12308
12309
12310
12311
12312
# File 'ext/RMagick/rmimage.c', line 12269

VALUE
Image_segment(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    int colorspace              = RGBColorspace;    // These are the Magick++ defaults
    unsigned int 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 = 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();
    SegmentImage(new_image, colorspace, verbose, cluster_threshold, smoothing_threshold, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    SegmentImage(new_image, colorspace, verbose, cluster_threshold, smoothing_threshold);
    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:


12093
12094
12095
12096
12097
12098
12099
12100
12101
12102
12103
12104
12105
12106
12107
12108
12109
12110
12111
12112
12113
12114
12115
12116
12117
12118
12119
12120
12121
12122
12123
12124
12125
12126
12127
12128
12129
12130
12131
# File 'ext/RMagick/rmimage.c', line 12093

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);
    new_image = SelectiveBlurImage(image, radius, sigma, threshold, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = SelectiveBlurImageChannel(image, channels, radius, sigma, threshold, exception);
#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:


12183
12184
12185
12186
12187
12188
12189
12190
12191
12192
12193
12194
12195
12196
12197
12198
12199
12200
12201
12202
12203
12204
12205
12206
12207
12208
12209
12210
12211
12212
# File 'ext/RMagick/rmimage.c', line 12183

VALUE
Image_separate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_images;
    ChannelType channels = 0;
    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);
    new_images = SeparateImages(image, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_images);
    END_CHANNEL_MASK(image);
#else
    new_images = SeparateImages(image, channels, exception);
#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:


12224
12225
12226
12227
12228
12229
12230
12231
12232
12233
12234
12235
12236
12237
12238
12239
12240
12241
12242
12243
12244
12245
12246
12247
12248
12249
12250
# File 'ext/RMagick/rmimage.c', line 12224

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();
    new_image = SepiaToneImage(image, threshold, exception);
    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


12141
12142
12143
12144
12145
12146
12147
12148
12149
12150
12151
12152
12153
12154
12155
12156
12157
12158
12159
12160
12161
12162
12163
12164
12165
12166
12167
12168
12169
# File 'ext/RMagick/rmimage.c', line 12141

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);
    SetImageDepth(image, channel_depth, exception);
    END_CHANNEL_MASK(image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SetImageChannelDepth(image, channel, channel_depth);
    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:


12418
12419
12420
12421
12422
12423
12424
12425
12426
12427
12428
12429
12430
12431
12432
12433
12434
12435
12436
12437
12438
12439
12440
12441
12442
12443
12444
12445
12446
12447
12448
# File 'ext/RMagick/rmimage.c', line 12418

VALUE
Image_shade(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double azimuth = 30.0, elevation = 30.0;
    unsigned int 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 = RTEST(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    new_image = ShadeImage(image, shading, azimuth, elevation, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#ImageMagick::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:


12465
12466
12467
12468
12469
12470
12471
12472
12473
12474
12475
12476
12477
12478
12479
12480
12481
12482
12483
12484
12485
12486
12487
12488
12489
12490
12491
12492
12493
12494
12495
12496
12497
12498
12499
12500
12501
12502
12503
12504
12505
12506
# File 'ext/RMagick/rmimage.c', line 12465

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();
    new_image = ShadowImage(image, alpha, sigma, x_offset, y_offset, exception);
    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:


12517
12518
12519
12520
12521
# File 'ext/RMagick/rmimage.c', line 12517

VALUE
Image_sharpen(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, 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:


12539
12540
12541
12542
12543
12544
12545
12546
12547
12548
12549
12550
12551
12552
12553
12554
12555
12556
12557
12558
12559
12560
12561
12562
12563
12564
12565
12566
12567
12568
12569
12570
12571
12572
12573
12574
12575
12576
12577
12578
12579
# File 'ext/RMagick/rmimage.c', line 12539

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);
    new_image = SharpenImage(image, radius, sigma, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = SharpenImageChannel(image, channels, radius, sigma, exception);
#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:


12591
12592
12593
12594
12595
12596
# File 'ext/RMagick/rmimage.c', line 12591

VALUE
Image_shave(VALUE self, VALUE width, VALUE height)
{
    rm_check_destroyed(self);
    return xform_image(False, self, INT2FIX(0), INT2FIX(0), width, height, 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:


12609
12610
12611
12612
12613
12614
# File 'ext/RMagick/rmimage.c', line 12609

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, 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:


12629
12630
12631
12632
12633
12634
12635
12636
12637
12638
12639
12640
12641
12642
12643
12644
12645
# File 'ext/RMagick/rmimage.c', line 12629

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();
    new_image = ShearImage(image, x, y, exception);
    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:


12676
12677
12678
12679
12680
12681
12682
12683
12684
12685
12686
12687
12688
12689
12690
12691
12692
12693
12694
12695
12696
12697
12698
12699
12700
12701
12702
12703
12704
12705
12706
12707
12708
12709
12710
12711
12712
12713
12714
12715
12716
12717
12718
12719
12720
12721
# File 'ext/RMagick/rmimage.c', line 12676

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);
    SigmoidalContrastImage(new_image, sharpen, contrast, midpoint, exception);
    END_CHANNEL_MASK(new_image);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    SigmoidalContrastImageChannel(new_image, channels, sharpen, contrast, midpoint);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}

#signatureString?

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


12730
12731
12732
12733
12734
12735
12736
12737
12738
12739
12740
12741
12742
12743
12744
12745
12746
12747
12748
12749
12750
12751
12752
12753
12754
12755
12756
# File 'ext/RMagick/rmimage.c', line 12730

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();
    SignatureImage(image, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    SignatureImage(image);
    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:


12769
12770
12771
12772
12773
12774
# File 'ext/RMagick/rmimage.c', line 12769

VALUE
Image_sketch(int argc, VALUE *argv, VALUE self)
{
    rm_check_destroyed(self);
    return motion_blur(argc, argv, self, 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


12787
12788
12789
12790
12791
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
# File 'ext/RMagick/rmimage.c', line 12787

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();
    SolarizeImage(new_image, threshold, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    SolarizeImage(new_image, threshold);
    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:


12953
12954
12955
12956
12957
12958
12959
12960
12961
12962
12963
12964
12965
12966
12967
12968
12969
12970
12971
12972
12973
12974
12975
12976
12977
12978
12979
12980
12981
12982
12983
12984
12985
12986
12987
12988
12989
12990
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
13034
13035
13036
13037
13038
13039
13040
13041
13042
13043
13044
13045
13046
13047
13048
13049
13050
13051
# File 'ext/RMagick/rmimage.c', line 12953

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);
    new_image = SparseColorImage(image, method, nargs, args, exception);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    new_image = SparseColorImage(image, channels, method, nargs, args, exception);
#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:


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
13109
13110
# File 'ext/RMagick/rmimage.c', line 13068

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;
    new_image = SpliceImage(image, &rectangle, exception);
    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:


13120
13121
13122
13123
13124
13125
13126
13127
13128
13129
13130
13131
13132
13133
13134
13135
13136
13137
13138
13139
13140
13141
13142
13143
13144
13145
13146
13147
13148
13149
# File 'ext/RMagick/rmimage.c', line 13120

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)
    new_image = SpreadImage(image, image->interpolate, radius, exception);
#else
    new_image = SpreadImage(image, radius, exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#start_loopBoolean

Get the Boolean value that indicates the first image in an animation.

Returns:

  • (Boolean)

    true or false


13157
13158
13159
13160
13161
# File 'ext/RMagick/rmimage.c', line 13157

VALUE
Image_start_loop(VALUE self)
{
    IMPLEMENT_ATTR_READER(Image, start_loop, boolean);
}

#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


13169
13170
13171
13172
13173
# File 'ext/RMagick/rmimage.c', line 13169

VALUE
Image_start_loop_eq(VALUE self, VALUE val)
{
    IMPLEMENT_ATTR_WRITER(Image, start_loop, boolean);
}

#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:


13188
13189
13190
13191
13192
13193
13194
13195
13196
13197
13198
13199
13200
13201
13202
13203
13204
13205
13206
13207
13208
13209
13210
13211
13212
# File 'ext/RMagick/rmimage.c', line 13188

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();
    new_image = SteganoImage(image, watermark, exception);
    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:


13222
13223
13224
13225
13226
13227
13228
13229
13230
13231
13232
13233
13234
13235
13236
13237
13238
13239
13240
13241
13242
13243
13244
# File 'ext/RMagick/rmimage.c', line 13222

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();
    new_image = StereoImage(image, offset, exception);
    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:


13338
13339
13340
13341
13342
13343
13344
13345
13346
13347
13348
13349
13350
13351
13352
13353
13354
13355
13356
13357
13358
13359
13360
13361
13362
13363
13364
13365
13366
13367
13368
13369
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
13417
13418
13419
13420
13421
13422
13423
13424
13425
13426
13427
13428
13429
13430
13431
13432
13433
13434
13435
13436
13437
13438
13439
13440
# File 'ext/RMagick/rmimage.c', line 13338

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;
    unsigned int 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();
    okay = SetImageStorageClass(image, DirectClass, exception);
    CHECK_EXCEPTION();
    if (!okay)
    {
        DestroyExceptionInfo(exception);
        rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
    }
#else
    okay = SetImageStorageClass(image, DirectClass);
    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.
    {
        pixels = GetAuthenticPixels(image, x, y, cols, rows, exception);
        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.");
                }
                Data_Get_Struct(new_pixel, Pixel, 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
            }
            SyncAuthenticPixels(image, exception);
            CHECK_EXCEPTION();
        }

        DestroyExceptionInfo(exception);
    }

    RB_GC_GUARD(new_pixel);

    return self;
}

#strip!Magick::Image

Strips an image of all profiles and comments.

Returns:


13448
13449
13450
13451
13452
13453
13454
13455
13456
13457
13458
13459
13460
13461
13462
13463
13464
13465
13466
13467
# File 'ext/RMagick/rmimage.c', line 13448

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:


13478
13479
13480
13481
13482
13483
13484
13485
13486
13487
13488
13489
13490
13491
13492
13493
13494
13495
13496
13497
13498
# File 'ext/RMagick/rmimage.c', line 13478

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)
    new_image = SwirlImage(image, degrees, image->interpolate, exception);
#else
    new_image = SwirlImage(image, degrees, exception);
#endif
    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


1056
1057
1058
# File 'lib/rmagick_internal.rb', line 1056

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:


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
13594
13595
13596
13597
13598
# File 'ext/RMagick/rmimage.c', line 13517

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();
    FloodfillPaintImage(new_image, draw_info, &color_mpp, x, y, invert, exception);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    FloodfillPaintImage(new_image, DefaultChannels, draw_info, &color_mpp, x, y, invert);

    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


1050
1051
1052
1053
# File 'lib/rmagick_internal.rb', line 1050

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:


13608
13609
13610
13611
13612
13613
13614
13615
13616
13617
13618
13619
13620
13621
13622
13623
13624
13625
13626
13627
13628
13629
13630
13631
# File 'ext/RMagick/rmimage.c', line 13608

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();
    BilevelImage(new_image, threshold, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    BilevelImageChannel(new_image, DefaultChannels, threshold);
    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:


13795
13796
13797
13798
13799
13800
# File 'ext/RMagick/rmimage.c', line 13795

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:


13817
13818
13819
13820
13821
13822
# File 'ext/RMagick/rmimage.c', line 13817

VALUE
Image_thumbnail_bang(int argc, VALUE *argv, VALUE self)
{
    rm_check_frozen(self);
    return thumbnail(True, argc, argv, self);
}

#ticks_per_secondNumeric

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


13832
13833
13834
13835
13836
13837
# File 'ext/RMagick/rmimage.c', line 13832

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


13848
13849
13850
13851
13852
13853
13854
# File 'ext/RMagick/rmimage.c', line 13848

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