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(*args) ⇒ Object

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

Ruby usage:

- @verbatim Image#initialize(cols,rows) @endverbatim
- @verbatim Image#initialize(cols,rows,fill) @endverbatim

Notes:

- Default fill is false

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object


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# File 'ext/RMagick/rmimage.c', line 9189

VALUE
Image_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE fill = 0;
    Info *info;
    VALUE info_obj;
    Image *image;
    unsigned long cols, rows;

    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 = AcquireImage(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);

    SetImageExtent(image, cols, rows);

    // 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 (!fill)
    {
        (void) SetImageBackgroundColor(image);
    }
    // fillobj.fill(self)
    else
    {
        (void) rb_funcall(fill, rm_ID_fill, 1, self);
    }

    RB_GC_GUARD(fill);
    RB_GC_GUARD(info_obj);

    return self;
}

Class Method Details

._load(str) ⇒ Object

Implement marshalling.

Ruby usage:

- @verbatim Image._load @endverbatim

Notes:

- calls BlobToImage

Parameters:

  • class

    Ruby class for Image

  • str

    the marshalled string

Returns:

  • a new image

See Also:

  • Image__dump

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# File 'ext/RMagick/rmimage.c', line 8050

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

    class = class;  // Suppress "never referenced" message from icc

    info = CloneImageInfo(NULL);

    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)");
    }

    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);
    (void) DestroyImageInfo(info);

    rm_check_exception(exception, image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(image);

    return rm_image_new(image);
}

.capture(*args) ⇒ Object

do a screen capture.

Ruby usage:

- @verbatim Image.capture @endverbatim
- @verbatim Image.capture(silent) { optional parms } @endverbatim
- @verbatim Image.capture(silent,frame) { optional parms } @endverbatim
- @verbatim Image.capture(silent,frame,descend) { optional parms } @endverbatim
- @verbatim Image.capture(silent,frame,descend,screen) { optional parms } @endverbatim
- @verbatim Image.capture(silent,frame,descend,screen,borders) { optional parms } @endverbatim

Notes:

- Default silent is false
- Default frame is false
- Default descent is false
- Default screen is false
- Default borders if false

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 2035

VALUE
Image_capture(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    ImageInfo *image_info;
    VALUE info_obj;
    XImportInfo ximage_info;

    self = self;  // Suppress "never referenced" message from icc

    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.
    image = XImportImage(image_info, &ximage_info);
    rm_check_image_exception(image, DestroyOnError);
    rm_ensure_result(image);

    rm_set_user_artifact(image, image_info);

    RB_GC_GUARD(info_obj);

    return rm_image_new(image);
}

.combineObject

.constitute(width_arg, height_arg, map_arg, pixels_arg) ⇒ Object

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.

Ruby usage:

- @verbatim Image.constitute(width, height, map, pixels) @endverbatim

Parameters:

  • class

    the Ruby class for an Image (unused)

  • width_arg

    the width of the array

  • height_arg

    the height of the array

  • map_arg

    the map (expected ordering of the pixel array)

  • pixels_arg

    the pixel array

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 3851

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

    class = class;  // Suppress "never referenced" message from icc

            // 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 = NUM2ULONG(width_arg);
    height = NUM2ULONG(height_arg);

    if (width == 0 || height == 0)
    {
        rb_raise(rb_eArgError, "width and height must be non-zero");
    }

    map = rm_str2cstr(map_arg, &map_l);

    npixels = (long)(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)
        {
            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)
            {
                rb_raise(rb_eArgError, "element %ld is out of range [0..1]: %f", x, pixels.f[x]);
            }
        }
        else
        {
            pixels.i[x] = NUM2QUANTUM(pixel);
        }
    }

    exception = AcquireExceptionInfo();

    // This is based on ConstituteImage in IM 5.5.7
    image = AcquireImage(NULL);
    if (!image)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue.");
    }

    SetImageExtent(image, width, height);
    rm_check_image_exception(image, DestroyOnError);

    (void) SetImageBackgroundColor(image);
    rm_check_image_exception(image, DestroyOnError);

    (void) ImportImagePixels(image, 0, 0, width, height, map, stg_type, (const void *)pixels.v);
    xfree(pixels.v);
    rm_check_image_exception(image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);
#if defined(HAVE_DESTROYCONSTITUTE) || defined(HAVE_CONSTITUTECOMPONENTTERMINUS)
    DestroyConstitute();
#endif

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

    return rm_image_new(image);
}

.from_blob(blob_arg) ⇒ Object

Call BlobToImage.

Ruby usage:

- @verbatim Image.from_blob(blob) <{ parm block }> @endverbatim

Parameters:

  • class

    the Ruby Image class (unused)

  • blob_arg

    the blog as a Ruby string

Returns:

  • an array of new images


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# File 'ext/RMagick/rmimage.c', line 6608

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

    class = class;          // defeat gcc message
            blob_arg = blob_arg;    // defeat gcc message

    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);

    (void) 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) ⇒ Object

Call ImagePing.

Ruby usage:

- @verbatim Image.ping(file) @endverbatim

Parameters:

  • class

    the Ruby class for an Image

  • file_arg

    the file containing image info

Returns:

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

See Also:

  • Image_read
  • rd_image

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# File 'ext/RMagick/rmimage.c', line 9847

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

.read(file_arg) ⇒ Object

Call ReadImage.

Ruby usage:

- @verbatim Image.read(file) @endverbatim

Parameters:

  • class

    the Ruby class for an Image

  • file_arg

    the file containing image data

Returns:

  • an array of 1 or more new image objects

See Also:

  • rd_image

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# File 'ext/RMagick/rmimage.c', line 10696

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

.read_inline(content) ⇒ Object

Read a Base64-encoded image.

Ruby usage:

- @verbatim Image.read_inline(content) @endverbatim

Notes:

- This is similar to, but not the same as ReadInlineImage. ReadInlineImage
  requires a comma preceeding the image data. This method allows but does
  not require a comma.

Parameters:

  • self

    this object

  • content

    the content

Returns:

  • an array of new images

See Also:

  • array_from_images

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# File 'ext/RMagick/rmimage.c', line 10863

VALUE
Image_read_inline(VALUE self, 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;

    self = self;    // defeat gcc message

    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);

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

    RB_GC_GUARD(info_obj);

    return array_from_images(images);
}

Instance Method Details

#<=>(other) ⇒ Object

Compare two images.

Ruby usage:

- @verbatim Image#<=> @endverbatim

Parameters:

  • self

    this image

  • other

    other image

Returns:

  • -1, 0, 1


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# File 'ext/RMagick/rmimage.c', line 12505

VALUE
Image_spaceship(VALUE self, VALUE other)
{
    Image *imageA, *imageB;
    const char *sigA, *sigB;
    int res;

    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);

    (void) SignatureImage(imageA);
    (void) SignatureImage(imageB);
    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) ⇒ Object

Return the image property associated with “key”.

Ruby usage:

- @verbatim Image#["key"] @endverbatim
- @verbatim Image#[:key] @endverbatim

Notes:

- Use Image#[]= (aset) to establish more properties or change the value of
  an existing property.

Parameters:

  • self

    this object

  • key_arg

    the key to get

Returns:

  • property value or nil if key doesn't exist


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# File 'ext/RMagick/rmimage.c', line 728

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 = StringValuePtr(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) ⇒ Object

Update or add image attribute “key”.

Ruby usage:

- @verbatim Image#["key"] = attr @endverbatim
- @verbatim Image#[:key] = attr @endverbatim

Notes:

- 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:

  • self

    this object

  • key_arg

    the key to set

  • attr_arg

    the value to which to set it

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 789

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 : StringValuePtr(attr_arg);

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

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

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


    // Delete existing value. SetImageProperty returns False if
    // the attribute doesn't exist - we don't care.
    (void) 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) ⇒ Object

Implement marshalling.

Ruby usage:

- @verbatim Image#_dump(aDepth) @endverbatim

Notes:

- Uses ImageToBlob - use the MIFF format in the blob since it's the most
  general

Parameters:

  • self

    this object

  • depth

    the depth to which to dump (unused)

Returns:

  • a string representing the dumped image


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# File 'ext/RMagick/rmimage.c', line 5265

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

    depth = depth;  // Suppress "never referenced" message from icc

    image = rm_check_destroyed(self);

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

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

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

    CHECK_EXCEPTION()

    (void) 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;
    strcpy(mi.magick, image->magick);
    mi.len = (unsigned char) min((size_t)UCHAR_MAX, strlen(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(*args) ⇒ Object

Call AdaptiveBlurImage.

Ruby usage:

- @verbatim Image#adaptive_blur @endverbatim
- @verbatim Image#adaptive_blur(radius) @endverbatim
- @verbatim Image#adaptive_blur(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 163

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

#adaptive_blur_channel(*args) ⇒ Object

Call AdaptiveBlurImageChannel.

Ruby usage:

- @verbatim Image#adaptive_blur_channel @endverbatim
- @verbatim Image#adaptive_blur_channel(radius) @endverbatim
- @verbatim Image#adaptive_blur_channel(radius, sigma) @endverbatim
- @verbatim Image#adaptive_blur_channel(radius, sigma, channel) @endverbatim
- @verbatim Image#adaptive_blur_channel(radius, sigma, channel, ...) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 191

VALUE
Image_adaptive_blur_channel(int argc, VALUE *argv, VALUE self)
{
    return adaptive_channel_method(argc, argv, self, AdaptiveBlurImageChannel);
}

#adaptive_resize(*args) ⇒ Object

Call AdaptiveResizeImage.

Ruby usage:

- @verbatim Image#adaptive_resize(scale_val) @endverbatim
- @verbatim Image#adaptive_resize(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 210

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);

    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#adaptive_sharpen(*args) ⇒ Object

Call AdaptiveSharpenImage.

Ruby usage:

- @verbatim Image#adaptive_sharpen @endverbatim
- @verbatim Image#adaptive_sharpen(radius) @endverbatim
- @verbatim Image#adaptive_sharpen(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 275

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

#adaptive_sharpen_channel(*args) ⇒ Object

Call AdaptiveSharpenImageChannel.

Ruby usage:

- @verbatim Image#adaptive_sharpen_channel(radius=0.0, sigma=1.0[, channel...]) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 294

VALUE
Image_adaptive_sharpen_channel(int argc, VALUE *argv, VALUE self)
{
    return adaptive_channel_method(argc, argv, self, AdaptiveSharpenImageChannel);
}

#adaptive_threshold(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#adaptive_threshold @endverbatim
- @verbatim Image#adaptive_threshold(width) @endverbatim
- @verbatim Image#adaptive_threshold(width, height) @endverbatim
- @verbatim Image#adaptive_threshold(width, height, offset) @endverbatim

Notes:

- Default width is 3
- Default height is 3
- Default offset is 0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 323

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#add_compose_mask(mask) ⇒ Object

Set the image composite mask.

Ruby usage:

- @verbatim Image#add_compose_mask(mask) @endverbatim

Parameters:

  • self

    this object

  • mask

    the composite mask

Returns:

  • self

See Also:

  • Image_mask
  • Image_delete_compose_mask
  • in ImageMagick

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# File 'ext/RMagick/rmimage.c', line 372

VALUE
Image_add_compose_mask(VALUE self, VALUE mask)
{
    Image *image;
    Image *mask_image = NULL;

    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");
    }

    // Delete any previously-existing mask image.
    // Store a clone of the new mask image.
    (void) SetImageMask(image, mask_image);
    (void) 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.

    return self;
}

#add_noise(noise) ⇒ Object

Add random noise to a copy of the image.

Ruby usage:

- @verbatim Image#add_noise(noise_type) @endverbatim

Parameters:

  • self

    this object

  • noise

    the noise

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 407

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();
    new_image = AddNoiseImage(image, noise_type, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#add_noise_channel(*args) ⇒ Object

Add random noise to a copy of the image.

Ruby usage:

- @verbatim Image#add_noise_channel(noise_type) @endverbatim
- @verbatim Image#add_noise_channel(noise_type,channel) @endverbatim
- @verbatim Image#add_noise_channel(noise_type,channel,channel,...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 445

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();
    new_image = AddNoiseImageChannel(image, channels, noise_type, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#add_profile(name) ⇒ Object

Add all the profiles in the specified file.

Ruby usage:

- @verbatim Image#add_profile(name) @endverbatim

Parameters:

  • self

    this object

  • name

    the profile filename

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 491

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;
    long profile_filename_l = 0;
    const StringInfo *profile;

    image = rm_check_frozen(self);

    // ProfileImage issues a warning if something goes wrong.
    profile_filename = rm_str2cstr(name, &profile_filename_l);

    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);
    }
    strncpy(info->filename, profile_filename, min((size_t)profile_filename_l, sizeof(info->filename)));
    info->filename[MaxTextExtent-1] = '\0';

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

    ResetImageProfileIterator(profile_image);
    profile_name = GetNextImageProfile(profile_image);
    while (profile_name)
    {
        profile = GetImageProfile(profile_image, profile_name);
        if (profile)
        {
            (void)ProfileImage(image, profile_name, GetStringInfoDatum(profile)
                               , GetStringInfoLength(profile), MagickFalse);
            if (image->exception.severity >= ErrorException)
            {
                break;
            }
        }
        profile_name = GetNextImageProfile(profile_image);
    }

    (void) DestroyImage(profile_image);
    rm_check_image_exception(image, RetainOnError);


    return self;
}

#affine_transform(affine) ⇒ Object

Transform an image as dictated by the affine matrix argument.

Ruby usage:

- @verbatim Image#affine_transform(affine_matrix) @endverbatim

Parameters:

  • self

    this object

  • affine

    the affine matrix

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 690

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#alpha(*args) ⇒ Object

Calls SetImageAlphaChannel.

Ruby usage:

- @verbatim Image#alpha(type) @endverbatim

Notes:

- 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.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • the type (or true/false if called without an argument, see above)


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# File 'ext/RMagick/rmimage.c', line 573

VALUE
Image_alpha(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    AlphaChannelType alpha;


    // 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, AlphaChannelType);

#if defined(HAVE_SETIMAGEALPHACHANNEL)
    // Added in 6.3.6-9
    (void) SetImageAlphaChannel(image, alpha);
    rm_check_image_exception(image, RetainOnError);
#else
    switch (alpha)
    {
        case ActivateAlphaChannel:
            image->matte = MagickTrue;
            break;

        case DeactivateAlphaChannel:
            image->matte = MagickFalse;
            break;

        case ResetAlphaChannel:
            if (image->matte == MagickFalse)
            {
                (void) SetImageOpacity(image, OpaqueOpacity);
                rm_check_image_exception(image, RetainOnError);
            }
            break;

        case SetAlphaChannel:
            (void) CompositeImage(image, CopyOpacityCompositeOp, image, 0, 0);
            rm_check_image_exception(image, RetainOnError);
            break;

        default:
            rb_raise(rb_eArgError, "unknown AlphaChannelType value");
            break;
    }
#endif

    return argv[0];
}

#alpha?Boolean

Determine whether the image's alpha channel is activated.

Ruby usage:

- @verbatim Image#alpha? @endverbatim

Notes:

- Replaces Image#matte

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if the image's alpha channel is activated


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# File 'ext/RMagick/rmimage.c', line 645

VALUE
Image_alpha_q(VALUE self)
{
    Image *image = rm_check_destroyed(self);
#if defined(HAVE_GETIMAGEALPHACHANNEL)
    return GetImageAlphaChannel(image) ? Qtrue : Qfalse;
#else
    return image->matte ? 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.


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# File 'lib/rmagick_internal.rb', line 783

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(*args) ⇒ Object

Get/set the auto Gamma channel

Ruby usage:

- @verbatim Image#auto_gamma_channel @endverbatim
- @verbatim Image#auto_gamma_channel channel @endverbatim
- @verbatim Image#auto_gamma_channel channel, ... @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 922

VALUE
Image_auto_gamma_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_AUTOGAMMAIMAGECHANNEL)
    return auto_channel(argc, argv, self, AutoGammaImageChannel);
#else
    rm_not_implemented();
    return (VALUE) 0;
    argc = argc;
    argv = argv;
    self = self;
#endif
}

#auto_level_channel(*args) ⇒ Object

Get/set the auto level channel

Ruby usage:

- @verbatim Image#auto_level_channel @endverbatim
- @verbatim Image#auto_level_channel channel @endverbatim
- @verbatim Image#auto_level_channel channel, ... @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 951

VALUE
Image_auto_level_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_AUTOLEVELIMAGECHANNEL)
    return auto_channel(argc, argv, self, AutoLevelImageChannel);
#else
    rm_not_implemented();
    return (VALUE)0;
    argc = argc;
    argv = argv;
    self = self;
#endif
}

#auto_orientObject

Implement mogrify's -auto_orient option automatically orient image based on EXIF orientation value.

Ruby usage:

- @verbatim Image#auto_orient @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image

See Also:

  • (in ImageMagick 6.2.8)

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# File 'ext/RMagick/rmimage.c', line 1045

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

#auto_orient!Object

Implement mogrify's -auto_orient option automatically orient image based on EXIF orientation value.

Ruby usage:

- @verbatim Image#auto_orient! @endverbatim

Parameters:

  • self

    this object

Returns:

  • nil if the image is already properly oriented, otherwise self


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# File 'ext/RMagick/rmimage.c', line 1063

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

#bilevel_channel(*args) ⇒ Object

Create a bilevel image.

Ruby usage:

- @verbatim Image#bilevel_channel(threshold) @endverbatim
- @verbatim Image#bilevel_channel(threshold, channel) @endverbatim

Notes:

- If no channel is specified AllChannels is used

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 1218

VALUE
Image_bilevel_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;

    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");
    }

    new_image = rm_clone_image(image);

    (void)BilevelImageChannel(new_image, channels, NUM2DBL(argv[0]));
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#black_threshold(*args) ⇒ Object

Call BlackThresholdImage.

Ruby usage:

- @verbatim Image#black_threshold(red_channel) @endverbatim
- @verbatim Image#black_threshold(red_channel, green_channel) @endverbatim
- @verbatim Image#black_threshold(red_channel, green_channel, blue_channel) @endverbatim
- @verbatim Image#black_threshold(red_channel, green_channel, blue_channel, opacity_channel) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • threshold_image
  • Image_white_threshold

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# File 'ext/RMagick/rmimage.c', line 1320

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

#blend(*args) ⇒ Object

Corresponds to the composite -blend operation.

Ruby usage:

- @verbatim Image#blend(overlay, src_percent, dst_percent) @endverbatim
- @verbatim Image#blend(overlay, src_percent, dst_percent, x_offset) @endverbatim
- @verbatim Image#blend(overlay, src_percent, dst_percent, x_offset, y_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset, y_offset) @endverbatim

Notes:

- Default x_offset is 0
- Default y_offset is 0
- Percent can be a number or a string in the form "NN%"
- The default value for dst_percent is 100%-src_percent

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 1663

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(*args) ⇒ Object

Call BlueShiftImage.

Ruby usage:

- @verbatim Image#blue_shift @endverbatim
- @verbatim Image#blue_shift(factor) @endverbatim

Notes:

- Default factor is 1.5

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 1727

VALUE
Image_blue_shift(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_BLUESHIFTIMAGE)
    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);
#else
    rm_not_implemented();
    return (VALUE)0;
    argc = argc;
    argv = argv;
    self = self;
#endif
}

#blur_channelObject

#blur_image(*args) ⇒ Object

Blur the image.

Ruby usage:

- @verbatim Image#blur_image @endverbatim
- @verbatim Image#blur_image(radius) @endverbatim
- @verbatim Image#blur_image(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- The "blur" name is used for the attribute

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 1843

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

#border(width, height, color) ⇒ Object

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

Ruby usage:

- @verbatim Image#border(width, height, color) @endverbatim

Parameters:

  • self

    this object

  • width

    the width of the border

  • height

    the height of the border

  • color

    the color of the border

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 1941

VALUE
Image_border(VALUE self, VALUE width, VALUE height, VALUE color)
{
    (void) 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.

Ruby usage:

- @verbatim Image#border!(width, height, color) @endverbatim

Parameters:

  • self

    this object

  • width

    the width of the border

  • height

    the height of the border

  • color

    the color of the border

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 1918

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

#change_geometry(geom_arg) ⇒ Object

parse geometry string, compute new image geometry.

Ruby usage:

- @verbatim Image#change_geometry(geometry_string) { |cols, rows, image| } @endverbatim

Parameters:

  • self

    this object

  • geom_arg

    the geometry string

Returns:

  • new image geometry


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# File 'ext/RMagick/rmimage.c', line 2096

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 = rm_to_s(geom_arg);
    geometry = StringValuePtr(geom_str);

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

    SetGeometry(image, &rect);
    rm_check_image_exception(image, RetainOnError);
    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) ⇒ Object

parse geometry string, compute new image geometry.

Ruby usage:

- @verbatim Image#change_geometry(geometry_string) { |cols, rows, image| } @endverbatim

Parameters:

  • self

    this object

  • geom_arg

    the geometry string

Returns:

  • new image geometry


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# File 'ext/RMagick/rmimage.c', line 2096

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 = rm_to_s(geom_arg);
    geometry = StringValuePtr(geom_str);

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

    SetGeometry(image, &rect);
    rm_check_image_exception(image, RetainOnError);
    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.

Ruby usage:

- @verbatim Image#changed? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if altered, false otherwise


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# File 'ext/RMagick/rmimage.c', line 2142

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

#channel(channel_arg) ⇒ Object

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

Ruby usage:

- @verbatim Image#channel @endverbatim

Parameters:

  • self

    this object

  • channel_arg

    the type of the channel to extract

Returns:

  • the channel of the specified type


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# File 'ext/RMagick/rmimage.c', line 2163

VALUE
Image_channel(VALUE self, VALUE channel_arg)
{
    Image *image, *new_image;
    ChannelType channel;

    image = rm_check_destroyed(self);

    VALUE_TO_ENUM(channel_arg, channel, ChannelType);

    new_image = rm_clone_image(image);

    (void) SeparateImageChannel(new_image, channel);

    rm_check_image_exception(new_image, DestroyOnError);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#channel_compare(*args) ⇒ Object

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

Ruby usage:

- @verbatim Image#compare_channel(ref_image, metric) { optional arguments } @endverbatim
- @verbatim Image#compare_channel(ref_image, metric, channel) { optional arguments } @endverbatim
- @verbatim Image#compare_channel(ref_image, metric, channel, ...) { optional arguments } @endverbatim

Notes:

- If no channels are specified, the default is AllChannels. That case is
  the equivalent of the CompareImages method in ImageMagick.
- Originally this method was called channel_compare, but that doesn't match
  the general naming convention that methods which accept multiple optional
  ChannelType arguments have names that end in _channel. So I renamed the
  method to compare_channel but kept channel_compare as an alias.
- The optional arguments are specified thusly:
  - self.highlight_color color
  - self.lowlight-color color
  where color is either a color name or a Pixel.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • an array of [difference_image,distortion]


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# File 'ext/RMagick/rmimage.c', line 3145

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();
    difference_image = CompareImageChannels(image
                                            , r_image
                                            , channels
                                            , metric_type
                                            , &distortion
                                            , exception);
    rm_check_exception(exception, difference_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(difference_image);

    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(*args) ⇒ Object

GetImageChannelDepth.

Ruby usage:

- @verbatim Image#channel_depth @endverbatim
- @verbatim Image#channel_depth(channel_depth) @endverbatim

Notes:

- Default channel_depth is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • the channel depth


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# File 'ext/RMagick/rmimage.c', line 2199

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();

    channel_depth = GetImageChannelDepth(image, channels, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    return ULONG2NUM(channel_depth);
}

#channel_extrema(*args) ⇒ min, max

Return an array [min, max] where 'min' and 'max' are the minimum and maximum values of all channels.

Ruby usage:

- @verbatim Image#channel_extrema @endverbatim
- @verbatim Image#channel_extrema(channel) @endverbatim

Notes:

- Default channel is AllChannels
- GM's implementation is very different from ImageMagick. This method
  follows the IM API very closely and then shoehorn's the GM API to
  more-or-less fit. Note that IM allows you to specify more than one
  channel argument. GM does not.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • (min, max)

    of the channel


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# File 'ext/RMagick/rmimage.c', line 2247

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();
    (void) GetImageChannelExtrema(image, channels, &min, &max, exception);
    CHECK_EXCEPTION()

    (void) 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(*args) ⇒ Object

Return an array of the mean and standard deviation for the channel.

Ruby usage:

- @verbatim Image#channel_mean @endverbatim
- @verbatim Image#channel_mean(channel) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • an array [mean, std. deviation]


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# File 'ext/RMagick/rmimage.c', line 2297

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();
    (void) GetImageChannelMean(image, channels, &mean, &stddev, exception);
    CHECK_EXCEPTION()

    (void) 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(*args) ⇒ Object

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

Ruby usage:

- @verbatim Image#charcoal @endverbatim
- @verbatim Image#charcoal(radius) @endverbatim
- @verbatim Image#charcoal(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 2350

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

#check_destroyedObject

If the target image has been destroyed, raise Magick::DestroyedImageError.

Ruby usage:

- @verbatim Image#check_destroyed @endverbatim

Parameters:

  • self

    this object

Returns:

  • nil


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# File 'ext/RMagick/rmimage.c', line 2367

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

#chop(x, y, width, height) ⇒ Object

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

Ruby usage:

- @verbatim Image#chop @endverbatim

Parameters:

  • self

    this object

  • x

    x position of start of region

  • y

    y position of start of region

  • width

    width of region

  • height

    height of region

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 2389

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

#cloneObject

Copy an image, along with its frozen and tainted state.

Ruby usage:

- @verbatim Image#clone @endverbatim

Parameters:

  • self

    this object

Returns:

  • a clone of this object


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# File 'ext/RMagick/rmimage.c', line 2444

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(*args) ⇒ Object

Equivalent to -clut option.

Ruby usage:

- @verbatim Image#clut_channel @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 2472

VALUE
Image_clut_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *clut;
    ChannelType channels;
    MagickBooleanType okay;

    image = rm_check_frozen(self);

    // check_destroyed before confirming the arguments
    if (argc >= 1)
    {
        (void) 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);

    okay = ClutImageChannel(image, channels, clut);
    rm_check_image_exception(image, RetainOnError);
    rm_check_image_exception(clut, RetainOnError);
    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


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# File 'lib/rmagick_internal.rb', line 805

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) ⇒ Object

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

Ruby usage:

- @verbatim Image#color_flood_fill(target_color, fill_color, x, y, method) @endverbatim

Notes:

- Use fuzz= to specify the tolerance amount
- Accepts either the FloodfillMethod or the FillToBorderMethod

Parameters:

  • self

    this object

  • target_color

    the color

  • fill_color

    the color to fill

  • xv

    the x position

  • yv

    the y position

  • method

    the method to call

Returns:

  • a new image

See Also:

  • Image_opaque

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# File 'ext/RMagick/rmimage.c', line 2739

VALUE
Image_color_flood_fill( VALUE self, VALUE target_color, VALUE fill_color
                        , VALUE xv, VALUE yv, VALUE method)
{
    Image *image, *new_image;
    PixelPacket target;
    DrawInfo *draw_info;
    PixelPacket fill;
    long x, y;
    int fill_method;

    image = rm_check_destroyed(self);

    // The target and fill args can be either a color name or
    // a Magick::Pixel.
    Color_to_PixelPacket(&target, target_color);
    Color_to_PixelPacket(&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 %lux%lu"
                 , 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);

#if defined(HAVE_FLOODFILLPAINTIMAGE)
    {
        MagickPixelPacket target_mpp;
        MagickBooleanType invert;

        GetMagickPixelPacket(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;
        }

        (void) FloodfillPaintImage(new_image, DefaultChannels, draw_info, &target_mpp, x, y, invert);
    }
#else
    (void) ColorFloodfillImage(new_image, draw_info, target, x, y, (PaintMethod)fill_method);
#endif
    // No need to check for error

    (void) DestroyDrawInfo(draw_info);
    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


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# File 'lib/rmagick_internal.rb', line 798

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

#color_histogramObject

Call GetImageHistogram.

Ruby usage:

- @verbatim Image_color_histogram(VALUE self); @endverbatim

Notes:

- returns hash @verbatim {aPixel=>count} @endverbatim

Parameters:

  • self

    this object

Returns:

  • a histogram


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# File 'ext/RMagick/rmimage.c', line 2522

VALUE
Image_color_histogram(VALUE self)
{
    Image *image, *dc_copy = NULL;
    VALUE hash, pixel;
    size_t x, colors;
    ColorPacket *histogram;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    // If image not DirectClass make a DirectClass copy.
    if (image->storage_class != DirectClass)
    {
        dc_copy = rm_clone_image(image);
        (void) SyncImage(dc_copy);
        magick_free(dc_copy->colormap);
        dc_copy->colormap = NULL;
        dc_copy->storage_class = DirectClass;
        image = dc_copy;
    }

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

    if (histogram == NULL)
    {
        if (dc_copy)
        {
            (void) DestroyImage(dc_copy);
        }
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
    if (exception->severity != UndefinedException)
    {
        (void) RelinquishMagickMemory(histogram);
        rm_check_exception(exception, dc_copy, DestroyOnError);
    }

    (void) DestroyExceptionInfo(exception);

    hash = rb_hash_new();
    for (x = 0; x < colors; x++)
    {
        pixel = Pixel_from_PixelPacket(&histogram[x].pixel);
        (void) rb_hash_aset(hash, pixel, ULONG2NUM((unsigned long)histogram[x].count));
    }

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

    if (dc_copy)
    {
        // Do not trace destruction
        (void) 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


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# File 'lib/rmagick_internal.rb', line 790

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

#color_reset!(fill) ⇒ Object

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


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# File 'lib/rmagick_internal.rb', line 811

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(*args) ⇒ Object

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

Ruby usage:

- @verbatim Image#colorize(r, g, b, target) @endverbatim
- @verbatim Image#colorize(r, g, b, matte, target) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 2827

VALUE
Image_colorize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double red, green, blue, matte;
    char opacity[50];
    PixelPacket 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_PixelPacket(&target, argv[3]);
        sprintf(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_PixelPacket(&target, argv[4]);
        sprintf(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();
    new_image = ColorizeImage(image, opacity, target, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#colormap(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#colormap(index) @endverbatim
- @verbatim Image#colormap(index, new-color) @endverbatim

Notes:

- The "new-color" argument can be either a color name or a Magick::Pixel.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • the name of the color


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# File 'ext/RMagick/rmimage.c', line 2888

VALUE
Image_colormap(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    unsigned long idx;
    PixelPacket 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_pixelpacket_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_PixelPacket(&new_color, argv[1]);

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

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

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

        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_pixelpacket_to_color_name(image, &color);
}

#compare_channel(*args) ⇒ Object

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

Ruby usage:

- @verbatim Image#compare_channel(ref_image, metric) { optional arguments } @endverbatim
- @verbatim Image#compare_channel(ref_image, metric, channel) { optional arguments } @endverbatim
- @verbatim Image#compare_channel(ref_image, metric, channel, ...) { optional arguments } @endverbatim

Notes:

- If no channels are specified, the default is AllChannels. That case is
  the equivalent of the CompareImages method in ImageMagick.
- Originally this method was called channel_compare, but that doesn't match
  the general naming convention that methods which accept multiple optional
  ChannelType arguments have names that end in _channel. So I renamed the
  method to compare_channel but kept channel_compare as an alias.
- The optional arguments are specified thusly:
  - self.highlight_color color
  - self.lowlight-color color
  where color is either a color name or a Pixel.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • an array of [difference_image,distortion]


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# File 'ext/RMagick/rmimage.c', line 3145

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();
    difference_image = CompareImageChannels(image
                                            , r_image
                                            , channels
                                            , metric_type
                                            , &distortion
                                            , exception);
    rm_check_exception(exception, difference_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(difference_image);

    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;
}

#composite(*args) ⇒ Object

Call CompositeImage.

Ruby usage:

- @verbatim Image#composite(image, x_off, y_off, composite_op) @endverbatim
- @verbatim Image#composite(image, gravity, composite_op) @endverbatim
- @verbatim Image#composite(image, gravity, x_off, y_off, composite_op) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 3440

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

#composite!(*args) ⇒ Object

Call CompositeImage.

Ruby usage:

- @verbatim Image#composite!(image, x_off, y_off, composite_op) @endverbatim
- @verbatim Image#composite!(image, gravity, composite_op) @endverbatim
- @verbatim Image#composite!(image, gravity, x_off, y_off, composite_op) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 3418

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

#composite_affine(source, affine_matrix) ⇒ Object

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

Ruby usage:

- @verbatim Image#composite_affine(composite, affine_matrix) @endverbatim

Parameters:

  • self

    this object

  • source

    the source image

  • affine_matrix

    affine transform matrix

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 3459

VALUE
Image_composite_affine(VALUE self, VALUE source, VALUE affine_matrix)
{
    Image *image, *composite_image, *new_image;
    AffineMatrix affine;

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

    Export_AffineMatrix(&affine, affine_matrix);
    (void) DrawAffineImage(new_image, composite_image, &affine);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#composite_channel(*args) ⇒ Object

Call CompositeImageChannel.

Ruby usage:

- @verbatim Image#composite_channel(src_image, geometry, composite_operator) @endverbatim
- @verbatim Image#composite_channel(src_image, geometry, composite_operator, channel) @endverbatim
- @verbatim Image#composite_channel(src_image, geometry, composite_operator, channel, ...) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 3531

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

#composite_channel!(*args) ⇒ Object

Call CompositeImageChannel.

Ruby usage:

- @verbatim Image#composite_channel!(src_image, geometry, composite_operator) @endverbatim
- @verbatim Image#composite_channel!(src_image, geometry, composite_operator, channel) @endverbatim
- @verbatim Image#composite_channel!(src_image, geometry, composite_operator, channel, ...) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 3553

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

#composite_mathematics(*args) ⇒ Object

Composite using MathematicsCompositeOp.

Ruby usage:

- @verbatim img.composite_mathematics(comp_img, A, B, C, D, gravity) @endverbatim
- @verbatim img.composite_mathematics(comp_img, A, B, C, D, x_off, y_off) @endverbatim
- @verbatim img.composite_mathematics(comp_img, A, B, C, D, gravity, x_off, y_off) @endverbatim

Notes:

- Default x_off is 0
- Default y_off is 0
- New in ImageMagick 6.5.4-3.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 3578

VALUE
Image_composite_mathematics(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_ENUM_MATHEMATICSCOMPOSITEOP)
    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);
    if (argc > 0)
    {
        composite_image = rm_check_destroyed(rm_cur_image(argv[0]));
    }

    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;
    }


    (void) sprintf(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_new(gravity);
    args[2] = LONG2FIX(x_off);
    args[3] = LONG2FIX(y_off);
    args[4] = CompositeOperator_new(MathematicsCompositeOp);

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

#else
    rm_not_implemented();
    argc = argc;
    argv = argv;
    self = self;
    return (VALUE)0;
#endif
}

#composite_tiled(*args) ⇒ Object

Emulate the -tile option to the composite command.

Ruby usage:

- @verbatim Image#composite_tiled(src) @endverbatim
- @verbatim Image#composite_tiled(src, composite_op) @endverbatim
- @verbatim Image#composite_tiled(src, composite_op, channel) @endverbatim
- @verbatim Image#composite_tiled(src, composite_op, channel, ...) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 3741

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

#composite_tiled!(*args) ⇒ Object

Emulate the -tile option to the composite command.

Ruby usage:

- @verbatim Image#composite_tiled!(src) @endverbatim
- @verbatim Image#composite_tiled!(src, composite_op) @endverbatim
- @verbatim Image#composite_tiled!(src, composite_op, channel) @endverbatim
- @verbatim Image#composite_tiled!(src, composite_op, channel, ...) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 3764

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

#compress_colormap!Object

call CompressImageColormap.

Ruby usage:

- @verbatim Image#compress_colormap! @endverbatim

Notes:

- API was CompressColormap until 5.4.9

Parameters:

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 3817

VALUE
Image_compress_colormap_bang(VALUE self)
{
    Image *image = rm_check_frozen(self);
    (void) CompressImageColormap(image);
    rm_check_image_exception(image, RetainOnError);

    return self;
}

#contrast(*args) ⇒ Object

Enhance the intensity differences between the lighter and darker elements of the image. Set sharpen to “true” to increase the image contrast otherwise the contrast is reduced.

Ruby usage:

- @verbatim Image#contrast @endverbatim
- @verbatim Image#contrast(sharpen) @endverbatim

Notes:

- Default sharpen is 0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 3989

VALUE
Image_contrast(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned int sharpen = 0;

    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);

    (void) ContrastImage(new_image, sharpen);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#contrast_stretch_channel(*args) ⇒ Object

Call ContrastStretchImageChannel.

Ruby usage:

- @verbatim Image#contrast_stretch_channel(black_point) @endverbatim
- @verbatim Image#contrast_stretch_channel(black_point, white_point) @endverbatim
- @verbatim Image#contrast_stretch_channel(black_point, white_point, channel) @endverbatim
- @verbatim Image#contrast_stretch_channel(black_point, white_point, channel, ...) @endverbatim

Notes:

- Default white_point is pixels-black_point
- Default channel is AllChannels
- Both black_point and white_point can be specified as Floats or as
  percentages, i.e. "10%"

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4098

VALUE
Image_contrast_stretch_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double black_point, white_point;

    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);

    (void) ContrastStretchImageChannel(new_image, channels, black_point, white_point);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#convolve(order_arg, kernel_arg) ⇒ Object

Apply a custom convolution kernel to the image.

Ruby usage:

- @verbatim Image#convolve(order, kernel) @endverbatim

Parameters:

  • self

    this object

  • order_arg

    the number of rows and columns in the kernel

  • kernel_arg

    an order**2 array of doubles

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4133

VALUE
Image_convolve(VALUE self, VALUE order_arg, VALUE kernel_arg)
{
    Image *image, *new_image;
    double *kernel;
    unsigned int x, order;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    order = NUM2UINT(order_arg);

    kernel_arg = rb_Array(kernel_arg);
    rm_check_ary_len(kernel_arg, (long)(order*order));

    // Convert the kernel array argument to an array of doubles

    kernel = (double *)ALLOC_N(double, order*order);
    for (x = 0; x < order*order; x++)
    {
        kernel[x] = NUM2DBL(rb_ary_entry(kernel_arg, (long)x));
    }

    exception = AcquireExceptionInfo();

    new_image = ConvolveImage((const Image *)image, order, (double *)kernel, exception);
    xfree((void *)kernel);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#convolve_channel(*args) ⇒ Object

call ConvolveImageChannel.

Ruby usage:

- @verbatim Image#convolve_channel(order, kernel) @endverbatim
- @verbatim Image#convolve_channel(order, kernel, channel) @endverbatim
- @verbatim Image#convolve_channel(order, kernel, channel, ...) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4183

VALUE
Image_convolve_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double *kernel;
    VALUE ary;
    unsigned int x, order;
    ChannelType channels;
    ExceptionInfo *exception;

    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 = NUM2UINT(argv[0]);
    ary = argv[1];

    rm_check_ary_len(ary, (long)(order*order));

    kernel = ALLOC_N(double, (long)(order*order));

    // Convert the kernel array argument to an array of doubles
    for (x = 0; x < order*order; x++)
    {
        kernel[x] = NUM2DBL(rb_ary_entry(ary, (long)x));
    }

    exception = AcquireExceptionInfo();

    new_image = ConvolveImageChannel(image, channels, order, kernel, exception);
    xfree((void *)kernel);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    RB_GC_GUARD(ary);

    return rm_image_new(new_image);
}

#copyObject

Alias for dup.

Ruby usage:

- @verbatim Image#copy @endverbatim

Parameters:

  • self

    this object

Returns:

  • a copy of self

See Also:

  • Image_dup

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# File 'ext/RMagick/rmimage.c', line 4247

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

#crop(*args) ⇒ Object

Extract a region of the image defined by width, height, x, y.

Ruby usage:

- @verbatim Image#crop(x, y, width, height) @endverbatim
- @verbatim Image#crop(gravity, width, height) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • cropper
  • Image_crop_bang

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# File 'ext/RMagick/rmimage.c', line 4293

VALUE
Image_crop(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return cropper(False, argc, argv, self);
}

#crop!(*args) ⇒ Object

Extract a region of the image defined by width, height, x, y.

Ruby usage:

- @verbatim Image#crop!(x, y, width, height) @endverbatim
- @verbatim Image#crop!(gravity, width, height) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:

  • cropper
  • Image_crop

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# File 'ext/RMagick/rmimage.c', line 4315

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

#cur_imageObject

Used by ImageList methods - see ImageList#cur_image


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# File 'lib/rmagick_internal.rb', line 826

def cur_image
  self
end

#cycle_colormap(amount) ⇒ Object

Call CycleColormapImage.

Ruby usage:

- @verbatim Image#cycle_colormap @endverbatim

Parameters:

  • self

    this object

  • amount

    amount to cycle the colormap

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4333

VALUE
Image_cycle_colormap(VALUE self, VALUE amount)
{
    Image *image, *new_image;
    int amt;

    image = rm_check_destroyed(self);

    new_image = rm_clone_image(image);
    amt = NUM2INT(amount);
    (void) CycleColormapImage(new_image, amt);
    // No need to check for an error

    return rm_image_new(new_image);
}

#decipher(passphrase) ⇒ Object

call DecipherImage.

Ruby usage:

- @verbatim Image#decipher(passphrase) @endverbatim

Parameters:

  • self

    this object

  • passphrase

    the passphrase

Returns:

  • a new deciphered image


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# File 'ext/RMagick/rmimage.c', line 4457

VALUE
Image_decipher(VALUE self, VALUE passphrase)
{
#if defined(HAVE_ENCIPHERIMAGE)
    Image *image, *new_image;
    char *pf;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    pf = StringValuePtr(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)
    {
        new_image = DestroyImage(new_image);
        rb_raise(rb_eRuntimeError, "DecipherImage failed for unknown reason.");
    }

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
#else
    self = self;
    passphrase = passphrase;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#define(artifact, value) ⇒ Object

Call SetImageArtifact.

Ruby usage:

- @verbatim value = Image#define(artifact, value) @endverbatim

Notes:

- 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:

  • self

    this object

  • artifact

    the artifact to set

  • value

    the value to which to set the artifact

Returns:

  • the value


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# File 'ext/RMagick/rmimage.c', line 4509

VALUE
Image_define(VALUE self, VALUE artifact, VALUE value)
{
#if defined(HAVE_SETIMAGEARTIFACT)
    Image *image;
    char *key, *val;
    MagickBooleanType status;

    image = rm_check_frozen(self);
    artifact = rb_String(artifact);
    key = StringValuePtr(artifact);

    if (value == Qnil)
    {
        (void) DeleteImageArtifact(image, key);
    }
    else
    {
        value = rb_String(value);
        val = StringValuePtr(value);
        status = SetImageArtifact(image, key, val);
        if (!status)
        {
            rb_raise(rb_eNoMemError, "not enough memory to continue");
        }
    }

    return value;
#else
    rm_not_implemented();
    artifact = artifact;
    value = value;
    self = self;
    return(VALUE)0;
#endif
}

#delete_compose_maskObject

#delete_profile(name) ⇒ Object

Call ProfileImage.

Ruby usage:

- @verbatim Image#delete_profile(name) @endverbatim

Parameters:

  • self

    this object

  • name

    the name of the profile to be deleted

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 4584

VALUE
Image_delete_profile(VALUE self, VALUE name)
{
    Image *image = rm_check_frozen(self);
    (void) ProfileImage(image, StringValuePtr(name), NULL, 0, MagickTrue);
    rm_check_image_exception(image, RetainOnError);

    return self;
}

#deskew(*args) ⇒ Object

Implement convert -deskew option.

Ruby usage:

- @verbatim Image#deskew @endverbatim
- @verbatim Image#deskew(threshold) @endverbatim
- @verbatim Image#deskew(threshold, auto-crop-width) @endverbatim

Notes:

- Default threshold is 0.40
- Default auto-crop-width is the auto crop width of the image

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4645

VALUE
Image_deskew(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_DESKEWIMAGE)
    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));
            sprintf(auto_crop_width, "%ld", 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()
    rm_ensure_result(new_image);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
#else
    self = self;        // defeat "unused parameter" message
    argv = argv;
    argc = argc;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#despeckleObject

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

Ruby usage:

- @verbatim Image#despeckle @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 4701

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#destroy!Object

Free all the memory associated with an image.

Ruby usage:

- @verbatim Image#destroy! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 4730

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.

Ruby usage:

- @verbatim Image#destroyed? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if destroyed, false otherwise


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# File 'ext/RMagick/rmimage.c', line 4752

VALUE
Image_destroyed_q(VALUE self)
{
    Image *image;

    Data_Get_Struct(self, Image, image);
    return image ? Qfalse : Qtrue;
}

#difference(other) ⇒ Object

Call the IsImagesEqual function.

Ruby usage:

- @verbatim Image#difference @endverbatim

Notes:

- "other" can be either an Image or an Image

normalized maximum error]

Parameters:

  • self

    this object

  • other

    another Image

Returns:

  • An array with 3 values: [mean error per pixel, normalized mean error,


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# File 'ext/RMagick/rmimage.c', line 4776

VALUE
Image_difference(VALUE self, VALUE other)
{
    Image *image;
    Image *image2;
    VALUE mean, nmean, nmax;

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

    (void) IsImagesEqual(image, image2);
    // No need to check for error

    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);
}

#dispatch(*args) ⇒ Object

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].

Ruby usage:

- @verbatim Image#dispatch(x, y, columns, rows, map) @endverbatim
- @verbatim Image#dispatch(x, y, columns, rows, map, float) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • an Array of pixel data


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# File 'ext/RMagick/rmimage.c', line 4901

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;

    (void) 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()

    (void) DestroyExceptionInfo(exception);

    // Convert the pixel data to the appropriate Ruby type
    if (stg_type == QuantumPixel)
    {
        for (n = 0; n < npixels; n++)
        {
            (void) rb_ary_push(pixels_ary, QUANTUM2NUM(pixels.i[n]));
        }
    }
    else
    {
        for (n = 0; n < npixels; n++)
        {
            (void) rb_ary_push(pixels_ary, rb_float_new(pixels.f[n]));
        }
    }

    exit:
    xfree((void *)pixels.v);

    RB_GC_GUARD(pixels_ary);

    return pixels_ary;
}

#displaceObject

#displayObject Also known as: __display__

Display the image to an X window screen.

Ruby usage:

- @verbatim Image#display @endverbatim

Parameters:

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 4993

VALUE
Image_display(VALUE self)
{
    Image *image;
    Info *info;
    VALUE info_obj;

    image = rm_check_destroyed(self);

    if (image->rows == 0 || image->columns == 0)
    {
        rb_raise(rb_eArgError, "invalid image geometry (%lux%lu)", image->rows, image->columns);
    }

    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);

    (void) DisplayImages(info, image);
    rm_check_image_exception(image, RetainOnError);

    RB_GC_GUARD(info_obj);

    return self;
}

#dissolve(*args) ⇒ Object

Corresponds to the composite_image -dissolve operation.

Ruby usage:

- @verbatim Image#dissolve(overlay, src_percent) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, x_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, x_offset, y_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset, y_offset) @endverbatim

Notes:

- `percent' can be a number or a string in the form "NN%"
- Default dst_percent is -1.0 (tells blend_geometry to leave it out of the
  geometry string)
- Default x_offset is 0
- Default y_offset is 0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • special_composite

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# File 'ext/RMagick/rmimage.c', line 5080

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(*args) ⇒ Object

Call DistortImage.

Ruby usage:

- @verbatim Image#distort(type, points) { optional arguments } @endverbatim
- @verbatim Image#distort(type, points, bestfit) { optional arguments } @endverbatim

Notes:

- Default bestfit is false
- Points is an Array of Numeric values
- Optional arguments are:
  - self.define "distort:viewport", WxH+X+Y
  - self.define "distort:scale", N
  - self.verbose true

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5147

VALUE
Image_distort(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    VALUE pts;
    unsigned long n, npoints;
    DistortImageMethod 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, DistortImageMethod);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (expected 2 or 3, got %d)", argc);
            break;
    }

    npoints = RARRAY_LEN(pts);
    // Allocate points array from Ruby's memory. If an error occurs Ruby will
    // be able to clean it up.
    points = ALLOC_N(double, npoints);

    for (n = 0; n < npoints; n++)
    {
        points[n] = NUM2DBL(rb_ary_entry(pts, n));
    }

    exception = AcquireExceptionInfo();
    new_image = DistortImage(image, distortion_method, npoints, points, bestfit, exception);
    xfree(points);
    rm_check_exception(exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    RB_GC_GUARD(pts);

    return rm_image_new(new_image);
}

#distortion_channel(*args) ⇒ Object

Call GetImageChannelDistortion.

Ruby usage:

- @verbatim Image#distortion_channel(reconstructed_image, metric) @endverbatim
- @verbatim Image#distortion_channel(reconstructed_image, metric, channel) @endverbatim
- @verbatim Image#distortion_channel(reconstructed_image, metric, channel, ...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • the image channel distortion (Ruby float)


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# File 'ext/RMagick/rmimage.c', line 5214

VALUE
Image_distortion_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *reconstruct;
    ChannelType channels;
    ExceptionInfo *exception;
    MetricType metric;
    VALUE rec;
    double distortion;

    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();
    (void) GetImageChannelDistortion(image, reconstruct, channels
                                     , metric, &distortion, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    RB_GC_GUARD(rec);

    return rb_float_new(distortion);
}

#dupObject

Construct a new image object and call initialize_copy.

Ruby usage:

- @verbatim Image#dup @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image

See Also:

  • Image_copy
  • Image_init_copy

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# File 'ext/RMagick/rmimage.c', line 5334

VALUE
Image_dup(VALUE self)
{
    VALUE dup;

    (void) rm_check_destroyed(self);
    dup = Data_Wrap_Struct(CLASS_OF(self), NULL, rm_image_destroy, NULL);
    if (rb_obj_tainted(self))
    {
        (void) rb_obj_taint(dup);
    }

    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


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# File 'lib/rmagick_internal.rb', line 888

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!


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# File 'lib/rmagick_internal.rb', line 831

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_profileObject

Iterate over image profiles.

Ruby usage:

- @verbatim Image#each_profile @endverbatim

Notes:

- ImageMagick only

Parameters:

  • self

    this object

Returns:

  • iterator over image profiles


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# File 'ext/RMagick/rmimage.c', line 5364

VALUE
Image_each_profile(VALUE self)
{
    Image *image;
    VALUE ary, val;
    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(*args) ⇒ Object

Find edges in an image. “radius” defines the radius of the convolution filter.

Ruby usage:

- @verbatim Image#edge @endverbatim
- @verbatim Image#edge(radius) @endverbatim

Notes:

- Default radius is 0 (have edge select a suitable radius)

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5418

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#emboss(*args) ⇒ Object

Create a grayscale image with a three-dimensional effect.

Ruby usage:

- @verbatim Image#emboss @endverbatim
- @verbatim Image#emboss(radius) @endverbatim
- @verbatim Image#emboss(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • effect_image

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# File 'ext/RMagick/rmimage.c', line 5518

VALUE
Image_emboss(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, EmbossImage);
}

#encipher(passphrase) ⇒ Object

Call EncipherImage.

Ruby usage:

- @verbatim Image#encipher(passphrase) @endverbatim

Parameters:

  • self

    this object

  • passphrase

    the passphrase with which to encipher

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5535

VALUE
Image_encipher(VALUE self, VALUE passphrase)
{
#if defined(HAVE_ENCIPHERIMAGE)
    Image *image, *new_image;
    char *pf;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    pf = StringValuePtr(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)
    {
        new_image = DestroyImage(new_image);
        rb_raise(rb_eRuntimeError, "EncipherImage failed for unknown reason.");
    }

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
#else
    self = self;
    passphrase = passphrase;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#enhanceObject

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

Ruby usage:

- @verbatim Image#enhance @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5615

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#equalizeObject

Apply a histogram equalization to the image.

Ruby usage:

- @verbatim Image#equalize @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5644

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

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

    (void) EqualizeImage(new_image);
    rm_check_image_exception(new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#equalize_channel(*args) ⇒ Object

Call EqualizeImageChannel.

Ruby usage:

- @verbatim Image#equalize_channel @endverbatim
- @verbatim Image#equalize_channel(channel) @endverbatim
- @verbatim Image#equalize_channel(channel, ...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5679

VALUE
Image_equalize_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_EQUALIZEIMAGECHANNEL)
    Image *image, *new_image;
    ExceptionInfo *exception;
    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);

    exception = AcquireExceptionInfo();

    (void) EqualizeImageChannel(new_image, channels);

    rm_check_image_exception(new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
#else
    argc = argc;
    argv = argv;
    self = self;
    rm_not_implemented();
    return(VALUE) 0;
#endif
}

#erase!Object

Reset the image to the background color.

Ruby usage:

- @verbatim Image#erase! @endverbatim

Notes:

- One of the very few Image methods that do not return a new image.

Parameters:

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 5726

VALUE
Image_erase_bang(VALUE self)
{
    Image *image = rm_check_frozen(self);

    (void) SetImageBackgroundColor(image);
    rm_check_image_exception(image, RetainOnError);

    return self;
}

#excerpt(x, y, width, height) ⇒ Object

Lightweight crop.

Ruby usage:

- @verbatim Image#excerpt(x, y, width, height) @endverbatim

Parameters:

  • self

    this object

  • x

    the x position for the start of the rectangle

  • y

    the y position for the start of the rectangle

  • width

    the width of the rectancle

  • height

    the height of the rectangle

Returns:

  • self if bang, otherwise a new image

See Also:

  • #excerpt
  • Image_excerpt_bang
  • Image_crop
  • Image_crop_bang

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# File 'ext/RMagick/rmimage.c', line 5808

VALUE
Image_excerpt(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
    (void) rm_check_destroyed(self);
    return excerpt(False, self, x, y, width, height);
}

#excerpt!(x, y, width, height) ⇒ Object

Lightweight crop.

Ruby usage:

- @verbatim Image#excerpt!(x, y, width, height) @endverbatim

Parameters:

  • self

    this object

  • x

    the x position for the start of the rectangle

  • y

    the y position for the start of the rectangle

  • width

    the width of the rectancle

  • height

    the height of the rectangle

Returns:

  • self

See Also:

  • #excerpt
  • Image_excerpt
  • Image_crop
  • Image_crop_bang

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# File 'ext/RMagick/rmimage.c', line 5833

VALUE
Image_excerpt_bang(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
    (void) rm_check_frozen(self);
    return excerpt(True, self, x, y, width, height);
}

#export_pixels(*args) ⇒ Object

Extract image pixels in the form of an array.

Ruby usage:

- @verbatim Image#export_pixels @endverbatim
- @verbatim Image#export_pixels(x) @endverbatim
- @verbatim Image#export_pixels(x, y) @endverbatim
- @verbatim Image#export_pixels(x, y, cols) @endverbatim
- @verbatim Image#export_pixels(x, y, cols, rows) @endverbatim
- @verbatim Image#export_pixels(x, y, cols, rows, map) @endverbatim

Notes:

- Default x is 0
- Default y is 0
- Default cols is self.columns
- Default rows is self.rows
- Default map is "RGB"

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • array of pixels


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# File 'ext/RMagick/rmimage.c', line 5864

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   = StringValuePtr(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 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.", NULL);
    }

    (void) DestroyExceptionInfo(exception);

    ary = rb_ary_new2(npixels);
    for (n = 0; n < npixels; n++)
    {
        (void) rb_ary_push(ary, QUANTUM2NUM(pixels[n]));
    }

    xfree((void *)pixels);

    RB_GC_GUARD(ary);

    return ary;
}

#export_pixels_to_str(*args) ⇒ Object

Extract image pixels to a Ruby string.

Ruby usage:

- @verbatim Image#export_pixels_to_str @endverbatim
- @verbatim Image#export_pixels_to_str(x) @endverbatim
- @verbatim Image#export_pixels_to_str(x, y) @endverbatim
- @verbatim Image#export_pixels_to_str(x, y, cols) @endverbatim
- @verbatim Image#export_pixels_to_str(x, y, cols, rows) @endverbatim
- @verbatim Image#export_pixels_to_str(x, y, cols, rows, map) @endverbatim
- @verbatim Image#export_pixels_to_str(x, y, cols, rows, map, type) @endverbatim

Notes:

- Default x is 0
- Default y is 0
- Default cols is self.columns
- Default rows is self.rows
- Default map is "RGB"
- Default type is Magick::CharPixel

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • pixels as a string


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# File 'ext/RMagick/rmimage.c', line 6040

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;
    char *str;
    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   = StringValuePtr(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 IntegerPixel:
            sz = sizeof(unsigned int);
            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("");
    (void) rb_str_resize(string, (long)(sz * npixels));
    str = StringValuePtr(string);

    exception = AcquireExceptionInfo();

    okay = ExportImagePixels(image, x_off, y_off, cols, rows, map, type, (void *)str, exception);
    if (!okay)
    {
        // Let GC have the string buffer.
        (void) rb_str_resize(string, 0);
        CHECK_EXCEPTION()

        // Should never get here...
        rm_magick_error("ExportImagePixels failed with no explanation.", NULL);
    }

    (void) DestroyExceptionInfo(exception);

    RB_GC_GUARD(string);

    return string;
}

#extent(*args) ⇒ Object

Call ExtentImage.

Ruby usage:

- @verbatim Image#extent(width, height) @endverbatim
- @verbatim Image#extent(width, height, x) @endverbatim
- @verbatim Image#extent(width, height, x, y) @endverbatim

Notes:

- Default x is 0
- Default y is 0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 5961

VALUE
Image_extent(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    RectangleInfo geometry;
    long height, width;
    ExceptionInfo *exception;

    (void) 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+%ld+%ld"
                     , 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);
    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);
    return rm_image_new(new_image);
}

#find_similar_region(*args) ⇒ Object

Search for a region in the image that is “similar” to the target image.

Ruby usage:

- @verbatim Image#find_similar_region(target) @endverbatim
- @verbatim Image#find_similar_region(target, x) @endverbatim
- @verbatim Image#find_similar_region(target, x, y) @endverbatim

Notes:

- Default x is 0
- Default y is 0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • the region


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# File 'ext/RMagick/rmimage.c', line 6262

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 = IsImageSimilar(image, target, &x, &y, exception);
    CHECK_EXCEPTION();
    (void) 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;
}

#flipObject

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

Ruby usage:

- @verbatim Image#flip @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image

See Also:

  • flipflop
  • Image_flip_bang
  • Image_flop
  • Image_flop_bang

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# File 'ext/RMagick/rmimage.c', line 6364

VALUE
Image_flip(VALUE self)
{
    (void) rm_check_destroyed(self);
    return flipflop(False, self, FlipImage);
}

#flip!Object

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

Ruby usage:

- @verbatim Image#flip! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self

See Also:

  • flipflop
  • Image_flip
  • Image_flop
  • Image_flop_bang

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# File 'ext/RMagick/rmimage.c', line 6386

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

#flopObject

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

Ruby usage:

- @verbatim Image#flop @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image

See Also:

  • flipflop
  • Image_flop_bang
  • Image_flip
  • Image_flip_bang

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# File 'ext/RMagick/rmimage.c', line 6408

VALUE
Image_flop(VALUE self)
{
    (void) rm_check_destroyed(self);
    return flipflop(False, self, FlopImage);
}

#flop!Object

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

Ruby usage:

- @verbatim Image#flop! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self

See Also:

  • flipflop
  • Image_flop
  • Image_flip
  • Image_flip_bang

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# File 'ext/RMagick/rmimage.c', line 6430

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

#frame(*args) ⇒ Object

Add a simulated three-dimensional border around the image. “Width” and “height” specify the width and height of the frame. The “x” and “y” arguments position the image within the frame. If the image is supposed to be centered in the frame, x and y should be 1/2 the width and height of the frame. (I.e., if the frame is 50 pixels high and 50 pixels wide, x and y should both be 25). “Inner_bevel” and “outer_bevel” indicate the width of the inner and outer shadows of the frame. They should be much smaller than the frame and cannot be > 1/2 the frame width or height of the image.

Ruby usage:

- @verbatim Image#frame @endverbatim
- @verbatim Image#frame(width) @endverbatim
- @verbatim Image#frame(width, height) @endverbatim
- @verbatim Image#frame(width, height, x) @endverbatim
- @verbatim Image#frame(width, height, x, y) @endverbatim
- @verbatim Image#frame(width, height, x, y, inner_bevel) @endverbatim
- @verbatim Image#frame(width, height, x, y, inner_bevel, outer_bevel) @endverbatim
- @verbatim Image#frame(width, height, x, y, inner_bevel, outer_bevel, color) @endverbatim

Notes:

- The defaults are the same as they are in Magick++
- Default width is image-columns+25*2
- Default height is image-rows+25*2
- Default x is 25
- Default y is 25
- Default inner is 6
- Default outer is 6
- Default color is image matte_color (which defaults to "#bdbdbd", whatever
  self.matte_color was set to when the image was created, or whatever
  image.matte_color is currently set to)

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image.


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# File 'ext/RMagick/rmimage.c', line 6547

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_PixelPacket(&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();
    new_image = FrameImage(image, &frame_info, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#function_channel(*args) ⇒ Object

Set the function on a channel.

Ruby usage:

 - @verbatim Image#function_channel(function, args) @endverbatim
 - @verbatim Image#function_channel(function, args, channel) @endverbatim
 - @verbatim Image#function_channel(function, args, channel, ...) @endverbatim

Notes:
  - Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 6658

VALUE
Image_function_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_FUNCTIONIMAGECHANNEL)
    Image *image, *new_image;
    MagickFunction function;
    unsigned long n, nparms;
    volatile double *parameters;
    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)
    {
#if defined(HAVE_ENUM_POLYNOMIALFUNCTION)
        case PolynomialFunction:
            if (argc == 0)
            {
                rb_raise(rb_eArgError, "PolynomialFunction requires at least one argument.");
            }
            break;
#endif
#if defined(HAVE_ENUM_SINUSOIDFUNCTION)
        case SinusoidFunction:
#endif
#if defined(HAVE_ENUM_ARCSINFUNCTION)
        case ArcsinFunction:
#endif
#if defined(HAVE_ENUM_ARCTANFUNCTION)
        case ArctanFunction:
#endif
           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;
    parameters = parms = ALLOC_N(double, nparms);

    for (n = 0; n < nparms; n++)
    {
        parms[n] = NUM2DBL(argv[n]);
    }

    exception = AcquireExceptionInfo();
    new_image = rm_clone_image(image);
    (void) FunctionImageChannel(new_image, channels, function, nparms, parms, exception);
    (void) xfree(parms);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
#else
    rm_not_implemented();
    return (VALUE)0;
    argc = argc;
    argv = argv;
    self = self;
#endif
}

#gamma_channelObject

#gamma_correct(*args) ⇒ Object

gamma-correct an image.

Ruby usage:

- @verbatim Image#gamma_correct(red_gamma) @endverbatim
- @verbatim Image#gamma_correct(red_gamma, green_gamma) @endverbatim
- @verbatim Image#gamma_correct(red_gamma, green_gamma, blue_gamma) @endverbatim

Notes:

- Default green_gamma is red_gamma
- Default blue_gamma is green_gamma
- For backward compatibility accept a 4th argument but ignore it.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 6837

VALUE
Image_gamma_correct(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double red_gamma, green_gamma, blue_gamma;
    char gamma_arg[50];

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            red_gamma   = NUM2DBL(argv[0]);

            // Can't have all 4 gamma values == 1.0. Also, very small values
            // cause ImageMagick to segv.
            if (red_gamma == 1.0 || fabs(red_gamma) < 0.003)
            {
                rb_raise(rb_eArgError, "invalid gamma value (%f)", red_gamma);
            }
            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;
    }

    sprintf(gamma_arg, "%f,%f,%f", red_gamma, green_gamma, blue_gamma);

    new_image = rm_clone_image(image);

    (void) GammaImage(new_image, gamma_arg);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#gaussian_blur(*args) ⇒ Object

Blur the image.

Ruby usage:

- @verbatim Image#gaussian_blur @endverbatim
- @verbatim Image#gaussian_blur(radius) @endverbatim
- @verbatim Image#gaussian_blur(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • effect_image

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# File 'ext/RMagick/rmimage.c', line 6903

VALUE
Image_gaussian_blur(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, GaussianBlurImage);
}

#gaussian_blur_channel(*args) ⇒ Object

Blur the image on a channel. Ruby usage:

- @verbatim Image#gaussian_blur_channel @endverbatim
- @verbatim Image#gaussian_blur_channel(radius) @endverbatim
- @verbatim Image#gaussian_blur_channel(radius, sigma) @endverbatim
- @verbatim Image#gaussian_blur_channel(radius, sigma, channel) @endverbatim
- @verbatim Image#gaussian_blur_channel(radius, sigma, channel, ...) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default channel is AllChannels
- New in IM 6.0.0

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# File 'ext/RMagick/rmimage.c', line 6927

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();
    new_image = GaussianBlurImageChannel(image, channels, radius, sigma, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#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.


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# File 'lib/rmagick_internal.rb', line 842

def get_exif_by_entry(*entry)
  ary = []
  if entry.length == 0
    exif_data = self['EXIF:*']
    if exif_data
      exif_data.split("\n").each { |exif| ary.push(exif.split('=')) }
    end
  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.


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# File 'lib/rmagick_internal.rb', line 860

def get_exif_by_number(*tag)
  hash = {}
  if tag.length == 0
    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['#%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.


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# File 'lib/rmagick_internal.rb', line 883

def get_iptc_dataset(ds)
  self['IPTC:'+ds]
end

#get_pixels(x_arg, y_arg, cols_arg, rows_arg) ⇒ Object

Call AcquireImagePixels.

Ruby usage:

- @verbatim Image#get_pixels(x, y, columns. rows) @endverbatim

Notes:

- This is the complement of store_pixels. Notice that the return value is
  an array object even when only one pixel is returned. store_pixels calls
  GetImagePixels, then SyncImage

rectangle defined by the geometry parameters.

Parameters:

  • self

    this object

  • x_arg

    x position of start of region

  • y_arg

    y position of start of region

  • cols_arg

    width of region

  • rows_arg

    height of region

Returns:

  • An array of Magick::Pixel objects corresponding to the pixels in the

See Also:

  • Image_store_pixels

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# File 'ext/RMagick/rmimage.c', line 7038

VALUE
Image_get_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg, VALUE rows_arg)
{
    Image *image;
    const PixelPacket *pixels;
    ExceptionInfo *exception;
    long x, y;
    unsigned long columns, rows;
    long size, n;
    VALUE pixel_ary;

    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();
#if defined(HAVE_GETVIRTUALPIXELS)
    pixels = GetVirtualPixels(image, x, y, columns, rows, exception);
#else
    pixels = AcquireImagePixels(image, x, y, columns, rows, exception);
#endif
    CHECK_EXCEPTION()

    (void) 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);

    // Convert the PixelPackets to Magick::Pixel objects
    for (n = 0; n < size; n++)
    {
        rb_ary_store(pixel_ary, n, Pixel_from_PixelPacket(&pixels[n]));
    }

    return pixel_ary;
}

#gray?Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities.

Ruby usage:

- @verbatim Image#gray? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if image is gray, false otherwise

See Also:

  • has_attribute

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# File 'ext/RMagick/rmimage.c', line 7130

VALUE
Image_gray_q(VALUE self)
{
    return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))IsGrayImage);
}

#grey?Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities.

Ruby usage:

- @verbatim Image#gray? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if image is gray, false otherwise

See Also:

  • has_attribute

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# File 'ext/RMagick/rmimage.c', line 7130

VALUE
Image_gray_q(VALUE self)
{
    return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))IsGrayImage);
}

#histogram?Boolean

Return true if has 1024 unique colors or less.

Ruby usage:

- @verbatim Image#histogram? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if image has <=1024 unique colors

See Also:

  • has_attribute

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# File 'ext/RMagick/rmimage.c', line 7147

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

#implode(*args) ⇒ Object

Implode the image by the specified percentage.

Ruby usage:

- @verbatim Image#implode @endverbatim
- @verbatim Image#implode(amount) @endverbatim

Notes:

- Default amount is 0.50

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 7169

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();

    new_image = ImplodeImage(image, amount, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#import_pixels(*args) ⇒ Object

Store image pixel data from an array.

Ruby usage:

- @verbatim Image#import_pixels @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:

  • Image_export_pixels

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# File 'ext/RMagick/rmimage.c', line 7211

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;

    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 = StringValuePtr(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 = strlen(map);
    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 IntegerPixel:
                type_sz = sizeof(unsigned int);
                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 %ld)"
                     , 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)
        {
            // Get an array for double pixels. Use Ruby's memory so GC will clean up after
            // us in case of an exception.
            fpixels = ALLOC_N(double, npixels);
            for (n = 0; n < npixels; n++)
            {
                fpixels[n] = NUM2DBL(rb_ary_entry(pixel_ary, n));
            }
            buffer = (void *) fpixels;
            stg_type = DoublePixel;
        }
        else
        {
            // Get array for Quantum pixels. Use Ruby's memory so GC will clean up after us
            // in case of an exception.
            pixels = ALLOC_N(Quantum, npixels);
            for (n = 0; n < npixels; n++)
            {
                VALUE p = rb_ary_entry(pixel_ary, n);
                pixels[n] = NUM2QUANTUM(p);
                RB_GC_GUARD(p);
            }
            buffer = (void *) pixels;
            stg_type = QuantumPixel;
        }
    }


    okay = ImportImagePixels(image, x_off, y_off, cols, rows, map, stg_type, buffer);

    // Free pixel array before checking for errors.
    if (pixels)
    {
        xfree((void *)pixels);
    }
    if (fpixels)
    {
        xfree((void *)fpixels);
    }

    if (!okay)
    {
        rm_check_image_exception(image, RetainOnError);
        // Shouldn't get here...
        rm_magick_error("ImportImagePixels failed with no explanation.", NULL);
    }

    RB_GC_GUARD(pixel_arg);
    RB_GC_GUARD(pixel_ary);

    return self;
}

#initialize_copy(orig) ⇒ Object

Initialize copy, clone, dup.

Ruby usage:

- @verbatim Image#initialize_copy @endverbatim

Parameters:

  • copy

    the destination image

  • orig

    the source image

Returns:

  • copy

See Also:

  • Image_copy
  • Image_clone
  • Image_dup

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# File 'ext/RMagick/rmimage.c', line 4266

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;
}

#inspectObject

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

Ruby usage:

- @verbatim Image#inspect @endverbatim

Notes:

- This is essentially the IdentifyImage except the description is built in
  a char buffer instead of being written to a file.

Parameters:

  • self

    this object

Returns:

  • the string

See Also:

  • build_inspect_string

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# File 'ext/RMagick/rmimage.c', line 7533

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);
}

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

(Thanks to Al Evans for the suggestion.)


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# File 'lib/rmagick_internal.rb', line 912

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
    unless gamma_arg
      white_point = Magick::QuantumRange - black_point
    end
  end

  level2(black_point, white_point, gamma)
end

#level2Object

#level_channel(*args) ⇒ Object

Similar to Image#level but applies to a single channel only.

Ruby usage:

- @verbatim Image#level_channel(aChannelType) @endverbatim
- @verbatim Image#level_channel(aChannelType, black) @endverbatim
- @verbatim Image#level_channel(aChannelType, black, white) @endverbatim
- @verbatim Image#level_channel(aChannelType, black, white, gamma) @endverbatim

Notes:

- Default black is 0.0
- Default white is QuantumRange
- Default gamma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • Image_level2

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# File 'ext/RMagick/rmimage.c', line 7725

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;

    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);

    (void) LevelImageChannel(new_image, channel, black_point, white_point, gamma_val);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#level_colors(*args) ⇒ Object

Implement +level_colors blank_color,white_color.

Ruby usage:

- @verbatim Image#level_colors @endverbatim
- @verbatim Image#level_colors(black_color) @endverbatim
- @verbatim Image#level_colors(black_color, white_color) @endverbatim
- @verbatim Image#level_colors(black_color, white_color, invert) @endverbatim
- @verbatim Image#level_colors(black_color, white_color, invert, channel) @endverbatim
- @verbatim Image#level_colors(black_color, white_color, invert, channel, ...) @endverbatim

Notes:

- Default black_color is "black"
- Default white_color is "white"
- Default invert is true
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 7788

VALUE
Image_level_colors(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_LEVELIMAGECOLORS) || defined(HAVE_LEVELCOLORSIMAGECHANNEL)
    Image *image, *new_image;
    MagickPixelPacket black_color, white_color;
    ChannelType channels;
    ExceptionInfo *exception;
    MagickBooleanType invert = MagickTrue;
    MagickBooleanType status;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    switch (argc)
    {
        case 3:
            invert = RTEST(argv[2]);

        case 2:
            Color_to_MagickPixelPacket(image, &white_color, argv[1]);
            Color_to_MagickPixelPacket(image, &black_color, argv[0]);
            break;

        case 1:
            Color_to_MagickPixelPacket(image, &black_color, argv[0]);
            exception = AcquireExceptionInfo();

            GetMagickPixelPacket(image, &white_color);
            (void) QueryMagickColor("white", &white_color, exception);
            CHECK_EXCEPTION()

            DestroyExceptionInfo(exception);

        case 0:
            exception = AcquireExceptionInfo();

            GetMagickPixelPacket(image, &white_color);
            (void) QueryMagickColor("white", &white_color, exception);
            CHECK_EXCEPTION()

            GetMagickPixelPacket(image, &black_color);
            (void) QueryMagickColor("black", &black_color, exception);
            CHECK_EXCEPTION()

            DestroyExceptionInfo(exception);
            break;

        default:
            raise_ChannelType_error(argv[argc-1]);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(HAVE_LEVELCOLORSIMAGECHANNEL)      // new in 6.5.6-4
    status = LevelColorsImageChannel(new_image, channels, &black_color, &white_color, invert);
#else
    status = LevelImageColors(new_image, channels, &black_color, &white_color, invert);
#endif
    rm_check_image_exception(new_image, DestroyOnError);
    if (!status)
    {
        rb_raise(rb_eRuntimeError, "LevelImageColors failed for unknown reason.");
    }

    return rm_image_new(new_image);

#else
    rm_not_implemented();
    self = self;
    argc = argc;
    argv = argv;
    return(VALUE)0;
#endif
}

#levelize_channel(*args) ⇒ Object

Levelize on a channel.

Ruby usage:

- @verbatim Image#levelize_channel(black_point) @endverbatim
- @verbatim Image#levelize_channel(black_point, white_point) @endverbatim
- @verbatim Image#levelize_channel(black_point, white_point, gamma) @endverbatim
- @verbatim Image#levelize_channel(black_point, white_point, gamma, channel) @endverbatim
- @verbatim Image#levelize_channel(black_point, white_point, gamma, channel, ...) @endverbatim

Notes:

- Default white_point is QuantumRange
- Default gamma is 1.0
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 7888

VALUE
Image_levelize_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_LEVELIZEIMAGECHANNEL)
    Image *image, *new_image;
    ChannelType channels;
    double black_point, white_point;
    double gamma = 1.0;
    MagickBooleanType status;

    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);
    status = LevelizeImageChannel(new_image, channels, black_point, white_point, gamma);

    rm_check_image_exception(new_image, DestroyOnError);
    if (!status)
    {
        rb_raise(rb_eRuntimeError, "LevelizeImageChannel failed for unknown reason.");
    }
    return rm_image_new(new_image);
#else
    rm_not_implemented();
    self = self;
    argc = argc;
    argv = argv;
    return(VALUE)0;
#endif
}

#linear_stretch(*args) ⇒ Object

Call LinearStretchImage.

Ruby usage:

- @verbatim Image_linear_stretch(black_point) @endverbatim
- @verbatim Image_linear_stretch(black_point , white_point) @endverbatim

Notes:

- Default white_point is pixels-black_point

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • Image_contrast_stretch_channel.
  • get_black_white_point

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# File 'ext/RMagick/rmimage.c', line 7958

VALUE
Image_linear_stretch(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double black_point, white_point;

    image = rm_check_destroyed(self);
    get_black_white_point(image, argc, argv, &black_point, &white_point);
    new_image = rm_clone_image(image);

    (void) LinearStretchImage(new_image, black_point, white_point);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#liquid_rescale(*args) ⇒ Object

Call the LiquidRescaleImage API.

Ruby usage:

- @verbatim Image#liquid_rescale(columns, rows) @endverbatim
- @verbatim Image#liquid_rescale(columns, rows, delta_x) @endverbatim
- @verbatim Image#liquid_rescale(columns, rows, delta_x, rigidity) @endverbatim

Notes:

- Default delta_x is 0.0
- Default rigidity is 0.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 7992

VALUE
Image_liquid_rescale(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_LIQUIDRESCALEIMAGE)
    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);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
#else
    argc = argc;    // defeat "unused parameter" messages
    argv = argv;
    self = self;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#magnifyObject

Scale an image proportionally to twice its size.

Ruby usage:

- @verbatim Image#magnify @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 8167

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

#magnify!Object

Scale an image proportionally to twice its size.

Ruby usage:

- @verbatim Image#magnify! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 8186

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

#map(*args) ⇒ Object

Call MapImage.

Ruby usage:

- @verbatim Image#map(map_image) @endverbatim
- @verbatim Image#map(map_image, dither) @endverbatim

Notes:

- Default dither is false

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 8209

VALUE
Image_map(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    Image *map;
    VALUE map_obj, map_arg;
    unsigned int dither = MagickFalse;

#if defined(HAVE_REMAPIMAGE)
    QuantizeInfo quantize_info;
    rb_warning("Image#map is deprecated. Use Image#remap instead");
#endif

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            dither = RTEST(argv[1]);
        case 1:
            map_arg = argv[0];
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    new_image = rm_clone_image(image);

    map_obj = rm_cur_image(map_arg);
    map = rm_check_destroyed(map_obj);
#if defined(HAVE_REMAPIMAGE)
    GetQuantizeInfo(&quantize_info);
    quantize_info.dither=dither;
    (void) RemapImage(&quantize_info, new_image, map);
#else
    (void) MapImage(new_image, map, dither);
#endif
    rm_check_image_exception(new_image, DestroyOnError);

    RB_GC_GUARD(map_obj);
    RB_GC_GUARD(map_arg);

    return rm_image_new(new_image);
}

#marshal_dumpimg.filename, img.to_blob

Support Marshal.dump >= 1.8.

Ruby usage:

- @verbatim Image#marshal_dump @endverbatim

Parameters:

  • self

    this object

Returns:


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# File 'ext/RMagick/rmimage.c', line 8265

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);
    if (image->filename)
    {
        rb_ary_store(ary, 0, rb_str_new2(image->filename));
    }
    else
    {
        rb_ary_store(ary, 0, Qnil);
    }

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

    // Destroy info before raising an exception
    DestroyImageInfo(info);
    CHECK_EXCEPTION()
    (void) 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 >= 1.8.

Ruby usage:

- @verbatim Image#marshal_load @endverbatim

Parameters:

  • self

    this object

  • ary

    the array returned from marshal_dump

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 8318

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);

    exception = AcquireExceptionInfo();
    if (filename != Qnil)
    {
        strcpy(info->filename, RSTRING_PTR(filename));
    }
    image = BlobToImage(info, RSTRING_PTR(blob), RSTRING_LEN(blob), exception);

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

    UPDATE_DATA_PTR(self, image);

    return self;
}

#mask(*args) ⇒ Object

Associate a clip mask with the image.

Ruby usage:

- @verbatim Image#mask @endverbatim
- @verbatim Image#mask(mask-image) @endverbatim

Notes:

- Omit the argument to get a copy of the current clip mask.
- Pass "nil" for the mask-image to remove the current clip mask.
- If the clip mask is not the same size as the target image, resizes the
  clip mask to match the target.
- Distinguish from Image#clip_mask=

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • copy of the current clip-mask or nil

See Also:

  • get_image_mask

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# File 'ext/RMagick/rmimage.c', line 8424

VALUE
Image_mask(int argc, VALUE *argv, VALUE self)
{
    VALUE mask;
    Image *image, *mask_image, *resized_image;
    Image *clip_mask;
    long x, y;
    PixelPacket *q;
    ExceptionInfo *exception;

    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];

    if (mask != Qnil)
    {
        mask = rm_cur_image(mask);
        mask_image = rm_check_destroyed(mask);
        clip_mask = rm_clone_image(mask_image);

        // Resize if necessary
        if (clip_mask->columns != image->columns || clip_mask->rows != image->rows)
        {
            exception = AcquireExceptionInfo();
            resized_image = ResizeImage(clip_mask, image->columns, image->rows
                                        , UndefinedFilter, 0.0, exception);
            rm_check_exception(exception, resized_image, DestroyOnError);
            (void) DestroyExceptionInfo(exception);
            rm_ensure_result(resized_image);
            (void) DestroyImage(clip_mask);
            clip_mask = resized_image;
        }

        // The following section is copied from mogrify.c (6.2.8-8)
#if defined(HAVE_SYNCAUTHENTICPIXELS)
        exception = AcquireExceptionInfo();
#endif
        for (y = 0; y < (long) clip_mask->rows; y++)
        {
#if defined(HAVE_GETAUTHENTICPIXELS)
            q = GetAuthenticPixels(clip_mask, 0, y, clip_mask->columns, 1, exception);
            rm_check_exception(exception, clip_mask, DestroyOnError);
#else
            q = GetImagePixels(clip_mask, 0, y, clip_mask->columns, 1);
            rm_check_image_exception(clip_mask, DestroyOnError);
#endif
            if (!q)
            {
                break;
            }
            for (x = 0; x < (long) clip_mask->columns; x++)
            {
                if (clip_mask->matte == MagickFalse)
                {
                    q->opacity = PIXEL_INTENSITY(q);
                }
                q->red = q->opacity;
                q->green = q->opacity;
                q->blue = q->opacity;
                q += 1;
            }

#if defined(HAVE_SYNCAUTHENTICPIXELS)
            SyncAuthenticPixels(clip_mask, exception);
            rm_check_exception(exception, clip_mask, DestroyOnError);
#else
            SyncImagePixels(clip_mask);
            rm_check_image_exception(clip_mask, DestroyOnError);
#endif
        }
#if defined(HAVE_SYNCAUTHENTICPIXELS)
        (void) DestroyExceptionInfo(exception);
#endif

        SetImageStorageClass(clip_mask, DirectClass);
        rm_check_image_exception(clip_mask, DestroyOnError);

        clip_mask->matte = MagickTrue;

        // SetImageClipMask clones the clip_mask image. We can
        // destroy our copy after SetImageClipMask is done with it.

        (void) SetImageClipMask(image, clip_mask);
        (void) DestroyImage(clip_mask);
    }
    else
    {
        (void) SetImageClipMask(image, NULL);
    }

    RB_GC_GUARD(mask);

    // Always return a copy of the mask!
    return get_image_mask(image);
}

#matte_fill_to_border(x, y) ⇒ Object

Make transparent any neighbor pixel that is not the border color.


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# File 'lib/rmagick_internal.rb', line 966

def matte_fill_to_border(x, y)
  f = copy
  f.opacity = Magick::OpaqueOpacity unless f.matte
  f.matte_flood_fill(border_color, TransparentOpacity,
                     x, y, FillToBorderMethod)
end

#matte_flood_fill(color, opacity, x_obj, y_obj, method_obj) ⇒ Object

Call MatteFloodFillImage.

Ruby usage:

- @verbatim Image#matte_flood_fill(color, opacity, x, y, method_obj) @endverbatim

Parameters:

  • self

    this object

  • color

    the color

  • opacity

    the opacity

  • x_obj

    x position

  • y_obj

    y position

  • method_obj

    which method to call: FloodfillMethod or FillToBorderMethod

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 8638

VALUE
Image_matte_flood_fill(VALUE self, VALUE color, VALUE opacity, VALUE x_obj, VALUE y_obj, VALUE method_obj)
{
    Image *image, *new_image;
    PixelPacket target;
    Quantum op;
    long x, y;
    PaintMethod method;

    image = rm_check_destroyed(self);
    Color_to_PixelPacket(&target, color);

    op = APP2QUANTUM(opacity);

    VALUE_TO_ENUM(method_obj, method, PaintMethod);
    if (!(method == FloodfillMethod || method == FillToBorderMethod))
    {
        rb_raise(rb_eArgError, "paint method_obj must be FloodfillMethod or "
                 "FillToBorderMethod (%d given)", method);
    }
    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 %lux%lu"
                 , x, y, image->columns, image->rows);
    }


    new_image = rm_clone_image(image);

#if defined(HAVE_FLOODFILLPAINTIMAGE)
    {
        DrawInfo *draw_info;
        MagickPixelPacket target_mpp;
        MagickBooleanType invert;

        // 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");
        }
        draw_info->fill.opacity = op;

        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;
        }

        (void) FloodfillPaintImage(new_image, OpacityChannel, draw_info, &target_mpp, x, y, invert);
    }
#else
    (void) MatteFloodfillImage(new_image, target, op, x, y, method);
#endif
    rm_check_image_exception(new_image, DestroyOnError);

    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.


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# File 'lib/rmagick_internal.rb', line 957

def matte_floodfill(x, y)
  f = copy
  f.opacity = OpaqueOpacity unless f.matte
  target = f.pixel_color(x, y)
  f.matte_flood_fill(target, TransparentOpacity,
                     x, y, FloodfillMethod)
end

#matte_point(x, y) ⇒ Object

Make the pixel at (x,y) transparent.


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# File 'lib/rmagick_internal.rb', line 937

def matte_point(x, y)
  f = copy
  f.opacity = OpaqueOpacity unless f.matte
  pixel = f.pixel_color(x,y)
  pixel.opacity = TransparentOpacity
  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).


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# File 'lib/rmagick_internal.rb', line 948

def matte_replace(x, y)
  f = copy
  f.opacity = OpaqueOpacity unless f.matte
  target = f.pixel_color(x, y)
  f.transparent(target)
end

#matte_reset!Object

Make all pixels transparent.


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# File 'lib/rmagick_internal.rb', line 974

def matte_reset!
  self.opacity = Magick::TransparentOpacity
  self
end

#median_filter(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#median_filter @endverbatim
- @verbatim Image#median_filter(radius) @endverbatim

Notes:

- Default radius is 0.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 8726

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();
#if defined(HAVE_STATISTICIMAGE)
    new_image = StatisticImage(image, MedianStatistic, (size_t)radius, (size_t)radius, exception);
#else
    new_image = MedianFilterImage(image, radius, exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#minifyObject

Scale an image proportionally to half its size.

Ruby usage:

- @verbatim Image#minify @endverbatim

Returns:

  • minify: a new image 1/2x the size of the input image

  • minify!: self, 1/2x

  • a new image

See Also:

  • Image_minify_bang

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# File 'ext/RMagick/rmimage.c', line 8818

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

#minify!Object

Scale an image proportionally to half its size.

Ruby usage:

- @verbatim Image#minify! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self

See Also:

  • Image_minify

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# File 'ext/RMagick/rmimage.c', line 8836

VALUE
Image_minify_bang(VALUE self)
{
    (void) rm_check_frozen(self);
    return magnify(True, self, MinifyImage);
}

#modulate(*args) ⇒ Object

Control the brightness, saturation, and hue of an image.

Ruby usage:

- @verbatim Image#modulate @endverbatim
- @verbatim Image#modulate(brightness) @endverbatim
- @verbatim Image#modulate(brightness, saturation) @endverbatim
- @verbatim Image#modulate(brightness, saturation, hue) @endverbatim

Notes:

- Default brightness is 100.0
- Default saturation is 100.0
- Default hue is 100.0
- all three arguments are optional and default to 100%

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 8864

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];

    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);
    }
    sprintf(modulate, "%f%%,%f%%,%f%%", pct_brightness, pct_saturation, pct_hue);

    new_image = rm_clone_image(image);

    (void) ModulateImage(new_image, modulate);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#monochrome?Boolean

Return true if all the pixels in the image have the same red, green, and blue intensities and the intensity is either 0 or QuantumRange.

Ruby usage:

- @verbatim Image#monochrome? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if monochrome, false otherwise


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# File 'ext/RMagick/rmimage.c', line 8949

VALUE
Image_monochrome_q(VALUE self)
{
    return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))IsMonochromeImage);
}

#motion_blur(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#motion_blur @endverbatim
- @verbatim Image#motion_blur(radius) @endverbatim
- @verbatim Image#motion_blur(radius, sigma) @endverbatim
- @verbatim Image#motion_blur(radius, sigma, angle) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default angle is 0.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9047

VALUE
Image_motion_blur(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return motion_blur(argc, argv, self, MotionBlurImage);
}

#negate(*args) ⇒ Object

Negate the colors in the reference image. The grayscale option means that only grayscale values within the image are negated.

Ruby usage:

- @verbatim Image#negate @endverbatim
- @verbatim Image#negate(grayscale) @endverbatim

Notes:

- Default grayscale is false.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9071

VALUE
Image_negate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned int grayscale = MagickFalse;

    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);

    (void) NegateImage(new_image, grayscale);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#negate_channel(*args) ⇒ Object

Negate the colors on a particular channel. The grayscale option means that only grayscale values within the image are negated.

Ruby usage:

- @verbatim Image#negate_channel(grayscale=false, channel=AllChannels) @endverbatim

Ruby usage:

- @verbatim Image#negate_channel @endverbatim
- @verbatim Image#negate_channel(grayscale) @endverbatim
- @verbatim Image#negate_channel(grayscale, channel) @endverbatim
- @verbatim Image#negate_channel(grayscale, channel, ...) @endverbatim

Notes:

- Default grayscale is false.
- Default channel is AllChannels.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9118

VALUE
Image_negate_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    unsigned int grayscale = MagickFalse;

    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]);
    }

    Data_Get_Struct(self, Image, image);

    new_image = rm_clone_image(image);

    (void)NegateImageChannel(new_image, channels, grayscale);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#normalizeObject

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

Ruby usage:

- @verbatim Image#normalize @endverbatim

Parameters:

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9284

VALUE
Image_normalize(VALUE self)
{
    Image *image, *new_image;

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

    (void) NormalizeImage(new_image);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#normalize_channel(*args) ⇒ Object

Call NormalizeImageChannel.

Ruby usage:

- @verbatim Image#normalize_channel @endverbatim
- @verbatim Image#normalize_channel(channel) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9314

VALUE
Image_normalize_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;

    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);

    (void) NormalizeImageChannel(new_image, channels);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#oil_paintObject

#opaque(target, fill) ⇒ Object

Change any pixel that matches target with the color defined by fill.

Ruby usage:

- @verbatim Image#opaque(target-color-name, fill-color-name) @endverbatim
- @verbatim Image#opaque(target-pixel, fill-pixel) @endverbatim

Notes:

- By default a pixel must match the specified target color exactly.
- Use Image_fuzz_eq to set the amount of tolerance acceptable to consider
  two colors as the same.

Parameters:

  • self

    this object

  • target

    either the color name or the pixel

  • fill

    the color for filling

See Also:

  • Image_fuzz_eq

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# File 'ext/RMagick/rmimage.c', line 9455

VALUE
Image_opaque(VALUE self, VALUE target, VALUE fill)
{
    Image *image, *new_image;
    MagickPixelPacket target_pp;
    MagickPixelPacket fill_pp;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

    // Allow color name or Pixel
    Color_to_MagickPixelPacket(image, &target_pp, target);
    Color_to_MagickPixelPacket(image, &fill_pp, fill);

#if defined(HAVE_OPAQUEPAINTIMAGECHANNEL)
    okay = OpaquePaintImageChannel(new_image, DefaultChannels, &target_pp, &fill_pp, MagickFalse);
#else
    okay =  PaintOpaqueImageChannel(new_image, DefaultChannels, &target_pp, &fill_pp);
#endif
    rm_check_image_exception(new_image, DestroyOnError);

    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);
}

#opaque?Boolean

Return true if any of the pixels in the image have an opacity value other than opaque ( 0 ).

Ruby usage:

- @verbatim Image#opaque? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if opaque, false otherwise


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# File 'ext/RMagick/rmimage.c', line 9588

VALUE
Image_opaque_q(VALUE self)
{
    return has_attribute(self, IsOpaqueImage);
}

#opaque_channel(*args) ⇒ Object

Improved Image#opaque available in ImageMagick 6.3.7-10.

Ruby usage:

- @verbatim Image#opaque_channel @endverbatim
- @verbatim opaque_channel(target, fill) @endverbatim
- @verbatim opaque_channel(target, fill, invert) @endverbatim
- @verbatim opaque_channel(target, fill, invert, fuzz) @endverbatim
- @verbatim opaque_channel(target, fill, invert, fuzz, channel) @endverbatim
- @verbatim opaque_channel(target, fill, invert, fuzz, channel, ...) @endverbatim

Notes:

- Default invert is false
- Default fuzz is the image's fuzz (see Image_fuzz_eq)
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9509

VALUE
Image_opaque_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_OPAQUEPAINTIMAGECHANNEL)
    Image *image, *new_image;
    MagickPixelPacket target_pp, fill_pp;
    ChannelType channels;
    double keep, fuzz;
    MagickBooleanType okay, invert = MagickFalse;

    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_MagickPixelPacket(image, &fill_pp, argv[1]);
            Color_to_MagickPixelPacket(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;

    okay = OpaquePaintImageChannel(new_image, channels, &target_pp, &fill_pp, invert);

    // Restore saved fuzz value
    new_image->fuzz = keep;
    rm_check_image_exception(new_image, DestroyOnError);

    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);

#else
    argc = argc;    // defeat "unused parameter" messages
    argv = argv;
    self = self;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#ordered_dither(*args) ⇒ Object

Perform ordered dither on image.

Ruby usage:

- @verbatim Image#ordered_dither @endverbatim
- @verbatim Image#ordered_dither(threshold_map) @endverbatim

Notes:

- Default threshold_map is '2x2'
- Order of threshold_map must be 2, 3, or 4.
- If using ImageMagick >= 6.3.0, order can be any of the threshold strings
  listed by "convert -list Thresholds"
- Does not call OrderedDitherImages anymore. Sometime after ImageMagick
  6.0.0 it quit working. Uses the same routines as ImageMagick and
  GraphicsMagick for their "ordered-dither" option.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9616

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 = StringValuePtr(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();

    // ImageMagick >= 6.2.9
    (void) OrderedPosterizeImage(new_image, threshold_map, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#paint_transparent(*args) ⇒ Object

Improved version of Image#transparent available in ImageMagick 6.3.7-10.

Ruby usage:

- @verbatim Image#paint_transparent(target) @endverbatim
- @verbatim Image#paint_transparent(target, opacity) @endverbatim
- @verbatim Image#paint_transparent(target, opacity, invert) @endverbatim
- @verbatim Image#paint_transparent(target, opacity, invert, fuzz) @endverbatim

Notes:

- Default opacity is TransparentOpacity
- Default invert is false
- Default fuzz is the image's fuzz (see Image_fuzz_eq)

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 9759

VALUE
Image_paint_transparent(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_TRANSPARENTPAINTIMAGE)
    Image *image, *new_image;
    MagickPixelPacket color;
    Quantum opacity = TransparentOpacity;
    double keep, fuzz;
    MagickBooleanType okay, invert = MagickFalse;

    image = rm_check_destroyed(self);

    // Default fuzz value is image's fuzz attribute.
    fuzz = image->fuzz;

    switch (argc)
    {
        case 4:
            fuzz = NUM2DBL(argv[3]);
        case 3:
            invert = RTEST(argv[2]);
        case 2:
            opacity = APP2QUANTUM(argv[1]);
        case 1:
            Color_to_MagickPixelPacket(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;

    okay = TransparentPaintImage(new_image, (const MagickPixelPacket *)&color, opacity, invert);
    new_image->fuzz = keep;

    // Is it possible for TransparentPaintImage to silently fail?
    rm_check_image_exception(new_image, DestroyOnError);
    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_ensure_result(NULL);
    }

    return rm_image_new(new_image);
#else
    argc = argc;    // defeat "unused parameter" messages
    argv = argv;
    self = self;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#palette?Boolean

Return true if the image is PseudoClass and has 256 unique colors or less.

Ruby usage:

- @verbatim Image#palette? @endverbatim

Parameters:

  • self

    this object

Returns:

  • (Boolean)

    true if palette, otherwise false


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# File 'ext/RMagick/rmimage.c', line 9828

VALUE
Image_palette_q(VALUE self)
{
    return has_attribute(self, IsPaletteImage);
}

#pixel_color(*args) ⇒ Object

Get/set the color of the pixel at x,y.

Ruby usage:

- @verbatim Image#pixel_color(x, y) @endverbatim
- @verbatim Image#pixel_color(x, y, color) @endverbatim

Notes:

- Without color, does a get. With color, does a set.
- "color", if present, may be either a color name or a Magick::Pixel.
- Based on Magick++'s Magick::pixelColor methods

return value is the old color.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • Magick::Pixel for pixel x,y. If called to set a new color, the


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# File 'ext/RMagick/rmimage.c', line 9872

VALUE
Image_pixel_color(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    PixelPacket old_color, new_color, *pixel;
    ExceptionInfo *exception;
    long x, y;
    unsigned int set = False;
    MagickBooleanType okay;

    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_PixelPacket(&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();
#if defined(HAVE_GETVIRTUALPIXELS)
        old_color = *GetVirtualPixels(image, x, y, 1, 1, exception);
#else
        old_color = *AcquireImagePixels(image, x, y, 1, 1, exception);
#endif
        CHECK_EXCEPTION()

        (void) DestroyExceptionInfo(exception);

        // PseudoClass
        if (image->storage_class == PseudoClass)
        {
#if defined(HAVE_GETAUTHENTICINDEXQUEUE)
            IndexPacket *indexes = GetAuthenticIndexQueue(image);
#else
            IndexPacket *indexes = GetIndexes(image);
#endif
            old_color = image->colormap[(unsigned long)*indexes];
        }
        if (!image->matte)
        {
            old_color.opacity = OpaqueOpacity;
        }
        return Pixel_from_PixelPacket(&old_color);
    }

    // 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_PixelPacket(&image->background_color);
    }

    // Set the color of a pixel. Return previous color.
    // Convert to DirectClass
    if (image->storage_class == PseudoClass)
    {
        okay = SetImageStorageClass(image, DirectClass);
        rm_check_image_exception(image, RetainOnError);
        if (!okay)
        {
            rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
        }
    }


#if defined(HAVE_GETAUTHENTICPIXELS) || defined(HAVE_SYNCAUTHENTICPIXELS)
    exception = AcquireExceptionInfo();
#endif

#if defined(HAVE_GETAUTHENTICPIXELS)
    pixel = GetAuthenticPixels(image, x, y, 1, 1, exception);
    CHECK_EXCEPTION()
#else
    pixel = GetImagePixels(image, x, y, 1, 1);
    rm_check_image_exception(image, RetainOnError);
#endif

    if (pixel)
    {
        old_color = *pixel;
        if (!image->matte)
        {
            old_color.opacity = OpaqueOpacity;
        }
    }
    *pixel = new_color;

#if defined(HAVE_SYNCAUTHENTICPIXELS)
    SyncAuthenticPixels(image, exception);
    CHECK_EXCEPTION()
#else
    SyncImagePixels(image);
    rm_check_image_exception(image, RetainOnError);
#endif

#if defined(HAVE_GETAUTHENTICPIXELS) || defined(HAVE_SYNCAUTHENTICPIXELS)
    (void) DestroyExceptionInfo(exception);
#endif

    return Pixel_from_PixelPacket(&old_color);
}

#polaroid(*args) ⇒ Object

Call PolaroidImage.

Ruby usage:

- @verbatim Image#polaroid { optional parms } @endverbatim
- @verbatim Image#polaroid(angle) { optional parms } @endverbatim

Notes:

- Default angle is -5
- Accepts an options block to get Draw attributes for drawing the label.
  Specify self.border_color to set a non-default border color.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10049

VALUE
Image_polaroid(int argc, VALUE *argv, VALUE self)
{
    Image *image, *clone, *new_image;
    VALUE options;
    double angle = -5.0;
    Draw *draw;
    ExceptionInfo *exception;

    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();
    new_image = PolaroidImage(clone, draw->info, angle, exception);
    rm_check_exception(exception, clone, DestroyOnError);

    (void) DestroyImage(clone);
    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    RB_GC_GUARD(options);

    return rm_image_new(new_image);
}

#posterize(*args) ⇒ Object

Call PosterizeImage.

Ruby usage:

- @verbatim Image#posterize(levels=4, dither=false) @endverbatim

Notes:

- Default levels is 4
- Default dither is false

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10108

VALUE
Image_posterize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType dither = MagickFalse;
    unsigned long levels = 4;

    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);

    (void) PosterizeImage(new_image, levels, dither);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#preview(preview) ⇒ Object

Call PreviewImage.

Ruby usage:

- @verbatim Image#preview(preview) @endverbatim

Parameters:

  • self

    this object

  • preview

    the preview

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10149

VALUE
Image_preview(VALUE self, VALUE preview)
{
    Image *image, *new_image;
    PreviewType preview_type;
    ExceptionInfo *exception;

    exception = AcquireExceptionInfo();
    image = rm_check_destroyed(self);
    VALUE_TO_ENUM(preview, preview_type, PreviewType);

    new_image = PreviewImage(image, preview_type, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#profile!(name, profile) ⇒ Object

Set the image profile. If “profile” is nil, deletes the profile. Otherwise “profile” must be a string containing the specified profile.

Ruby usage:

- @verbatim Image#profile!(name, profile) @endverbatim

Parameters:

  • self

    this object

  • name

    the profile name

  • profile

    the profile

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 10183

VALUE
Image_profile_bang(VALUE self, VALUE name, VALUE profile)
{

    if (profile == Qnil)
    {
        return Image_delete_profile(self, name);
    }
    else
    {
        return set_profile(self, StringValuePtr(name), profile);
    }

}

#propertiesObject

Traverse the attributes and yield to the block. If no block, return a hash of all the attribute keys & values.

Ruby usage:

- @verbatim Image#properties [{ |k,v| block }] @endverbatim

Notes:

- I use the word "properties" to distinguish between these "user-added"
  attribute strings and Image object attributes.

Parameters:

  • self

    this object

Returns:

  • self if block, else hash of attribute keys and values.


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# File 'ext/RMagick/rmimage.c', line 11991

VALUE
Image_properties(VALUE self)
{
    Image *image;
    VALUE attr_hash;
    VALUE ary;
    char *property;
    const char *value;

    image = rm_check_destroyed(self);

    if (rb_block_given_p())
    {
        ary = rb_ary_new2(2);

        ResetImagePropertyIterator(image);
        property = GetNextImageProperty(image);
        while (property)
        {
            value = GetImageProperty(image, property);
            (void) rb_ary_store(ary, 0, rb_str_new2(property));
            (void) rb_ary_store(ary, 1, rb_str_new2(value));
            (void) rb_yield(ary);
            property = GetNextImageProperty(image);
        }
        rm_check_image_exception(image, RetainOnError);

        RB_GC_GUARD(ary);

        return self;
    }

    // otherwise return properties hash
    else
    {
        attr_hash = rb_hash_new();
        ResetImagePropertyIterator(image);
        property = GetNextImageProperty(image);
        while (property)
        {
            value = GetImageProperty(image, property);
            (void) rb_hash_aset(attr_hash, rb_str_new2(property), rb_str_new2(value));
            property = GetNextImageProperty(image);
        }
        rm_check_image_exception(image, RetainOnError);

        RB_GC_GUARD(attr_hash);

        return attr_hash;
    }

}

#quantize(*args) ⇒ Object

Call QuantizeImage.

Ruby usage:

- @verbatim Image#quantize @endverbatim
- @verbatim Image#quantize(number_colors) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither, tree_depth) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither, tree_depth, measure_error) @endverbatim

Notes:

- Default number_colors is 256
- Default colorspace is Magick::RGBColorspace
- Default dither is true
- Default tree_depth is 0
- Default measure_error is false

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10438

VALUE
Image_quantize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    QuantizeInfo quantize_info;

    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 defined(HAVE_TYPE_DITHERMETHOD) && defined(HAVE_ENUM_NODITHERMETHOD)
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
                quantize_info.dither = quantize_info.dither_method != 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);

    (void) QuantizeImage(&quantize_info, new_image);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#quantum_operator(*args) ⇒ Object

This method is an adapter method that calls the EvaluateImageChannel method.

Ruby usage:

- @verbatim Image#quantum_operator(operator, rvalue) @endverbatim
- @verbatim Image#quantum_operator(operator, rvalue, channel) @endverbatim
- @verbatim Image#quantum_operator(operator, rvalue, channel, ...) @endverbatim

Notes:

- Historically this method used QuantumOperatorRegionImage in
  GraphicsMagick. By necessity this method implements the "lowest common
  denominator" of the two implementations.
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 10259

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;
#if defined(HAVE_ENUM_POWEVALUATEOPERATOR)
        case PowQuantumOperator:
            qop = PowEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_LOGEVALUATEOPERATOR)
        case LogQuantumOperator:
            qop = LogEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDEVALUATEOPERATOR)
        case ThresholdQuantumOperator:
            qop = ThresholdEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDBLACKEVALUATEOPERATOR)
        case ThresholdBlackQuantumOperator:
            qop = ThresholdBlackEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDWHITEEVALUATEOPERATOR)
        case ThresholdWhiteQuantumOperator:
            qop = ThresholdWhiteEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_GAUSSIANNOISEEVALUATEOPERATOR)
        case GaussianNoiseQuantumOperator:
            qop = GaussianNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_IMPULSENOISEEVALUATEOPERATOR)
        case ImpulseNoiseQuantumOperator:
            qop = ImpulseNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_LAPLACIANNOISEEVALUATEOPERATOR)
        case LaplacianNoiseQuantumOperator:
            qop = LaplacianNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_MULTIPLICATIVENOISEEVALUATEOPERATOR)
        case MultiplicativeNoiseQuantumOperator:
            qop = MultiplicativeNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_POISSONNOISEEVALUATEOPERATOR)
        case PoissonNoiseQuantumOperator:
            qop = PoissonNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_UNIFORMNOISEEVALUATEOPERATOR)
        case UniformNoiseQuantumOperator:
            qop = UniformNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_COSINEEVALUATEOPERATOR)
        case CosineQuantumOperator:
            qop = CosineEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_SINEEVALUATEOPERATOR)
        case SineQuantumOperator:
            qop = SineEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_ADDMODULUSEVALUATEOPERATOR)
        case AddModulusQuantumOperator:
            qop = AddModulusEvaluateOperator;
            break;
#endif
    }

    exception = AcquireExceptionInfo();
    (void) EvaluateImageChannel(image, channel, qop, rvalue, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    return self;
}

#radial_blur(angle) ⇒ Object

Call RadialBlurImage.

Ruby usage:

- @verbatim Image#radial_blur(angle) @endverbatim

Parameters:

  • self

    this object

  • angle

    the angle (in degrees)

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10493

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

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

#if defined(HAVE_ROTATIONALBLURIMAGE)
    new_image = RotationalBlurImage(image, NUM2DBL(angle), exception);
#else
    new_image = RadialBlurImage(image, NUM2DBL(angle), exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#radial_blur_channel(*args) ⇒ Object

Call RadialBlurImageChannel.

Ruby usage:

- @verbatim Image#radial_blur_channel(angle) @endverbatim
- @verbatim Image#radial_blur_channel(angle, channel) @endverbatim
- @verbatim Image#radial_blur_channel(angle, channel, ...) @endverbatim

Notes:

- Default channel is AllChannels
- Angle is in degrees

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10534

VALUE
Image_radial_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    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, "wrong number of arguments (0 for 1 or more)");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();

#if defined(HAVE_ROTATIONALBLURIMAGECHANNEL)
    new_image = RotationalBlurImageChannel(image, channels, NUM2DBL(argv[0]), exception);
#else
    new_image = RadialBlurImageChannel(image, channels, NUM2DBL(argv[0]), exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#raise(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#raise @endverbatim
- @verbatim Image#raise(width) @endverbatim
- @verbatim Image#raise(width, height) @endverbatim
- @verbatim Image#raise(width, height, raised) @endverbatim

Notes:

- Default width is 6
- Default height is 6
- Default raised is true

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10649

VALUE
Image_raise(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    RectangleInfo rect;
    int raised = MagickTrue;      // default

    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);

    (void) RaiseImage(new_image, &rect, raised);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#random_threshold_channel(*args) ⇒ Object

Call RandomThresholdImageChannel.

Ruby usage:

- @verbatim Image#random_threshold_channel(geometry_str) @endverbatim
- @verbatim Image#random_threshold_channel(geometry_str, channel) @endverbatim
- @verbatim Image#random_threshold_channel(geometry_str, channel, ...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10585

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 = rm_to_s(argv[0]);
    thresholds = StringValuePtr(geom_str);

    new_image = rm_clone_image(image);

    exception = AcquireExceptionInfo();

    (void) RandomThresholdImageChannel(new_image, channels, thresholds, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    RB_GC_GUARD(geom_str);

    return rm_image_new(new_image);
}

#recolor(color_matrix) ⇒ Object

Call RecolorImage.

Ruby usage:

- @verbatim Image#recolor(matrix) @endverbatim

Parameters:

  • self

    this object

  • color_matrix

    the matrix

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10797

VALUE
Image_recolor(VALUE self, VALUE color_matrix)
{
    Image *image, *new_image;
    unsigned long order;
    long x, len;
    double *matrix;
    ExceptionInfo *exception;

#if defined(HAVE_COLORMATRIXIMAGE)
    KernelInfo *kernel_info;
#endif

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

    // Allocate color matrix from Ruby's memory
    len = RARRAY_LEN(color_matrix);
    matrix = ALLOC_N(double, len);

    for (x = 0; x < len; x++)
    {
        matrix[x] = NUM2DBL(rb_ary_entry(color_matrix, x));
    }

    order = (unsigned long)sqrt((double)(len + 1.0));

    // RecolorImage sets the ExceptionInfo and returns a NULL image if an error occurs.
#if defined(HAVE_COLORMATRIXIMAGE)
    kernel_info = AcquireKernelInfo("1");
    if (kernel_info == (KernelInfo *) NULL)
      return((Image *) NULL);
    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;
    kernel_info = DestroyKernelInfo(kernel_info);
#else
    new_image = RecolorImage(image, order, matrix, exception);
#endif
    xfree((void *)matrix);

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

    return rm_image_new(new_image);
}

#reduce_noise(radius) ⇒ Object

Smooth the contours of an image while still preserving edge information.

Ruby usage:

- @verbatim Image#reduce_noise(radius) @endverbatim

Parameters:

  • self

    this object

  • radius

    the radius

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 10962

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

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
#if defined(HAVE_STATISTICIMAGE)
    new_image = StatisticImage(image, NonpeakStatistic, (size_t)radius, (size_t)radius, exception);
#else
    new_image = ReduceNoiseImage(image, NUM2DBL(radius), exception);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#remap(*args) ⇒ Object Also known as: affinity

Call RemapImage.

Ruby usage:

- @verbatim Image#remap(remap_image) @endverbatim
- @verbatim Image#remap(remap_image, dither_method) @endverbatim

Notes:

- Default dither_method is RiemersmaDitherMethod

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 10999

VALUE
Image_remap(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_REMAPIMAGE) || defined(HAVE_AFFINITYIMAGE)
    Image *image, *remap_image;
    QuantizeInfo quantize_info;

    image = rm_check_frozen(self);
    if (argc > 0)
    {
        VALUE t = rm_cur_image(argv[0]);
        remap_image = rm_check_destroyed(t);
        RB_GC_GUARD(t);
    }

    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
            quantize_info.dither = MagickTrue;
            break;
        case 1:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

#if defined(HAVE_REMAPIMAGE)
    (void) RemapImage(&quantize_info, image, remap_image);
#else
    (void) AffinityImage(&quantize_info, image, remap_image);
#endif
    rm_check_image_exception(image, RetainOnError);

    return self;
#else
    self = self;
    argc = argc;
    argv = argv;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#resample(*args) ⇒ Object

Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.

Ruby usage:

- @verbatim Image#resample @endverbatim
- @verbatim Image#resample(resolution) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution, filter) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution, filter, blur) @endverbatim

Notes:

- Default filter is image->filter
- Default blur is image->blur

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 11191

VALUE
Image_resample(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return resample(False, argc, argv, self);
}

#resample!(*args) ⇒ Object

Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.

Ruby usage:

- @verbatim Image#resample @endverbatim
- @verbatim Image#resample(resolution) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution, filter) @endverbatim
- @verbatim Image#resample(x_resolution, y_resolution, filter, blur) @endverbatim

Notes:

- Default filter is image->filter
- Default blur is image->blur

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 11221

VALUE
Image_resample_bang(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_frozen(self);
    return resample(True, argc, argv, self);
}

#resize(*args) ⇒ Object

Scale an image to the desired dimensions using the specified filter and blur factor.

Ruby usage:

- @verbatim Image#resize(scale) @endverbatim
- @verbatim Image#resize(cols, rows) @endverbatim
- @verbatim Image#resize(cols, rows, filter) @endverbatim
- @verbatim Image#resize(cols, rows, filter, blur) @endverbatim

Notes:

- Default filter is image->filter
- Default blur is image->blur

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 11334

VALUE
Image_resize(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return resize(False, argc, argv, self);
}

#resize!(*args) ⇒ Object

Scale an image to the desired dimensions using the specified filter and blur factor.

Ruby usage:

- @verbatim Image#resize!(scale) @endverbatim
- @verbatim Image#resize!(cols, rows) @endverbatim
- @verbatim Image#resize!(cols, rows, filter) @endverbatim
- @verbatim Image#resize!(cols, rows, filter, blur) @endverbatim

Notes:

- Default filter is image->filter
- Default blur is image->blur

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 11363

VALUE
Image_resize_bang(int argc, VALUE *argv, VALUE self)
{
    (void) 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!)


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# File 'lib/rmagick_internal.rb', line 981

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!


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# File 'lib/rmagick_internal.rb', line 985

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!)


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# File 'lib/rmagick_internal.rb', line 1001

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


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# File 'lib/rmagick_internal.rb', line 1008

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) ⇒ Object

Offset an image as defined by x_offset and y_offset.

Ruby usage:

- @verbatim Image#roll(x_offset, y_offset) @endverbatim

Parameters:

  • self

    this object

  • x_offset

    the x offset

  • y_offset

    the y offset

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 11382

VALUE
Image_roll(VALUE self, VALUE x_offset, VALUE y_offset)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    new_image = RollImage(image, NUM2LONG(x_offset), NUM2LONG(y_offset), exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#rotate(*args) ⇒ Object

Rotate the image.

Ruby usage:

- @verbatim Image#rotate(degrees) @endverbatim
- @verbatim Image#rotate(degrees, '<') @endverbatim
- @verbatim Image#rotate(degrees, '>') @endverbatim

Notes:

- If the 2nd argument is '<' rotate only if width < height. If the 2nd
  argument is '>' rotate only if width > height.
- Default is to always rotate

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 11489

VALUE
Image_rotate(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return rotate(False, argc, argv, self);
}

#rotate!(*args) ⇒ Object

Rotate the image.

Ruby usage:

- @verbatim Image#rotate!(degrees) @endverbatim
- @verbatim Image#rotate!(degrees, '<') @endverbatim
- @verbatim Image#rotate!(degrees, '>') @endverbatim

Notes:

- If the 2nd argument is '<' rotate only if width < height. If the 2nd
  argument is '>' rotate only if width > height.
- Default is to always rotate

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 11517

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

#sampleObject

#sample!(*args) ⇒ Object

Scale an image to the desired dimensions with pixel sampling.

Ruby usage:

- @verbatim Image#sample!(scale) @endverbatim
- @verbatim Image#sample!(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 11573

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

#scale(*args) ⇒ Object

Change the size of an image to the given dimensions.

Ruby usage:

- @verbatim Image#scale(scale) @endverbatim
- @verbatim Image#scale(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 11595

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

#scale!(*args) ⇒ Object

Change the size of an image to the given dimensions.

Ruby usage:

- @verbatim Image#scale!(scale) @endverbatim
- @verbatim Image#scale!(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 11617

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

#segment(*args) ⇒ Object

Call SegmentImage.

Ruby usage:

- @verbatim Image#segment @endverbatim
- @verbatim Image#segment(colorspace) @endverbatim
- @verbatim Image#segment(colorspace,cluster_threshold) @endverbatim
- @verbatim Image#segment(colorspace,cluster_threshold,smoothing_threshold) @endverbatim
- @verbatim Image#segment(colorspace,cluster_threshold,smoothing_threshold,verbose) @endverbatim

Notes:

- Default colorspace is RGBColorspace
- Default cluster_threshold is 1.0
- Default smoothing_threshold is 1.5
- Default verbose is false
- The default values are the same as Magick++

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 11916

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;

    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);

    (void) SegmentImage(new_image, colorspace, verbose, cluster_threshold, smoothing_threshold);
    rm_check_image_exception(new_image, DestroyOnError);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#selective_blur_channelObject

#separate(*args) ⇒ Object

Call SeparateImages.

Ruby usage:

- @verbatim separate @endverbatim
- @verbatim separate(channel) @endverbatim
- @verbatim separate(channel, ...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new ImageList


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# File 'ext/RMagick/rmimage.c', line 11822

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();
    new_images = SeparateImages(image, channels, exception);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);
    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#sepiatone(*args) ⇒ Object

Call SepiaToneImage.

Ruby usage:

- @verbatim Image#sepiatone @endverbatim
- @verbatim Image#sepiatone(threshold) @endverbatim

Notes:

- Default threshold is QuantumRange

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 11863

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);

    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#set_channel_depth(channel_arg, depth) ⇒ Object

Call SetImageChannelDepth.

Ruby usage:

- @verbatim Image#set_channel_depth(channel, depth) @endverbatim

Parameters:

  • self

    this object

  • channel_arg

    the channel

  • depth

    the depth

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 11787

VALUE
Image_set_channel_depth(VALUE self, VALUE channel_arg, VALUE depth)
{
    Image *image;
    ChannelType channel;
    unsigned long channel_depth;

    image = rm_check_frozen(self);

    VALUE_TO_ENUM(channel_arg, channel, ChannelType);
    channel_depth = NUM2ULONG(depth);

    (void) SetImageChannelDepth(image, channel, channel_depth);
    rm_check_image_exception(image, RetainOnError);

    return self;
}

#shade(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#shade @endverbatim
- @verbatim Image#shade(shading) @endverbatim
- @verbatim Image#shade(shading, azimuth) @endverbatim
- @verbatim Image#shade(shading, azimuth, elevation) @endverbatim

Notes:

- Default shading is false
- Default azimuth is 30
- Default elevation is 30

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12067

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);

    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#shadow(*args) ⇒ Object

Call ShadowImage. X- and y-offsets are the pixel offset. Opacity is either a number between 0 and 1 or a string “NN%”. Sigma is the std. dev. of the Gaussian, in pixels.

Ruby usage:

- @verbatim Image#shadow @endverbatim
- @verbatim Image#shadow(x_offset) @endverbatim
- @verbatim Image#shadow(x_offset, y_offset) @endverbatim
- @verbatim Image#shadow(x_offset, y_offset, sigma) @endverbatim
- @verbatim Image#shadow(x_offset, y_offset, sigma, opacity) @endverbatim

Notes:

- Default x_offset is 4
- Default y_offset is 4
- Default sigma is 4.0
- Default opacity is 1.0
- The defaults are taken from the mogrify.c source, except for opacity,
  which has no default.
- Introduced in ImageMagick 6.1.7

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12128

VALUE
Image_shadow(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double opacity = 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:
            opacity = rm_percentage(argv[3],1.0);   // Clamp to 1.0 < x <= 100.0
            if (fabs(opacity) < 0.01)
            {
                rb_warning("shadow will be transparent - opacity %g very small", opacity);
            }
            opacity = FMIN(opacity, 1.0);
            opacity = FMAX(opacity, 0.01);
            opacity *= 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, opacity, sigma, x_offset, y_offset, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#sharpen(*args) ⇒ Object

Sharpen an image.

Ruby usage:

- @verbatim Image#sharpen @endverbatim
- @verbatim Image#sharpen(radius) @endverbatim
- @verbatim Image#sharpen(radius, sigma) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • effect_image

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# File 'ext/RMagick/rmimage.c', line 12192

VALUE
Image_sharpen(int argc, VALUE *argv, VALUE self)
{
    return effect_image(self, argc, argv, SharpenImage);
}

#sharpen_channel(*args) ⇒ Object

Sharpen image on a channel.

Ruby usage:

- @verbatim Image#sharpen_channel @endverbatim
- @verbatim Image#sharpen_channel(radius) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma, channel) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma, channel, ...) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12219

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]);
    }

    new_image = rm_clone_image(image);

    exception = AcquireExceptionInfo();
    (void) SharpenImageChannel(new_image, channels, radius, sigma, exception);

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

    return rm_image_new(new_image);
}

#shave(width, height) ⇒ Object

Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.

Ruby usage:

- @verbatim Image#shave(width, height) @endverbatim

Parameters:

  • self

    this object

  • width

    the width to leave

  • height

    the hight to leave

Returns:

  • a new image

See Also:

  • xform_image
  • Image_shave_bang

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# File 'ext/RMagick/rmimage.c', line 12271

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

#shave!(width, height) ⇒ Object

Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.

Ruby usage:

- @verbatim Image#shave!(width, height) @endverbatim

Parameters:

  • self

    this object

  • width

    the width to leave

  • height

    the hight to leave

Returns:

  • self

See Also:

  • xform_image
  • Image_shave

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# File 'ext/RMagick/rmimage.c', line 12293

VALUE
Image_shave_bang(VALUE self, VALUE width, VALUE height)
{
    (void) rm_check_frozen(self);
    return xform_image(True, self, INT2FIX(0), INT2FIX(0), width, height, ShaveImage);
}

#shear(x_shear, y_shear) ⇒ Object

Call ShearImage.

Ruby usage:

- @verbatim Image#shear(x_shear, y_shear) @endverbatim

Parameters:

  • self

    this object

  • x_shear

    the x shear (in degrees)

  • y_shear

    the y shear (in degrees)

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12312

VALUE
Image_shear(VALUE self, VALUE x_shear, VALUE y_shear)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    new_image = ShearImage(image, NUM2DBL(x_shear), NUM2DBL(y_shear), exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);
    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#sigmoidal_contrast_channel(*args) ⇒ Object

Call SigmoidalContrastImageChannel.

Ruby usage:

- @verbatim Image#sigmoidal_contrast_channel @endverbatim
- @verbatim Image#sigmoidal_contrast_channel(contrast) @endverbatim
- @verbatim Image#sigmoidal_contrast_channel(contrast, midpoint) @endverbatim
- @verbatim Image#sigmoidal_contrast_channel(contrast, midpoint, sharpen) @endverbatim
- @verbatim Image#sigmoidal_contrast_channel(contrast, midpoint, sharpen, channel) @endverbatim
- @verbatim Image#sigmoidal_contrast_channel(contrast, midpoint, sharpen, channel, ...) @endverbatim

Notes:

- Default contrast is 3.0
- Default midpoint is 50.0
- Default sharpen is false
- Default channel is AllChannels

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12353

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;

    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);

    (void) SigmoidalContrastImageChannel(new_image, channels, sharpen, contrast, midpoint);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#signatureObject

Compute a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm.

Ruby usage:

- @verbatim Image#signature @endverbatim

Parameters:

  • self

    this object

Returns:

  • the message digest


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# File 'ext/RMagick/rmimage.c', line 12399

VALUE
Image_signature(VALUE self)
{
    Image *image;
    const char *signature;

    image = rm_check_destroyed(self);

    (void) SignatureImage(image);
    signature = rm_get_property(image, "signature");
    rm_check_image_exception(image, RetainOnError);
    if (!signature)
    {
        return Qnil;
    }
    return rb_str_new(signature, 64);
}

#sketch(*args) ⇒ Object

Call SketchImage.

Ruby usage:

- @verbatim Image#sketch @endverbatim
- @verbatim Image#sketch(radius) @endverbatim
- @verbatim Image#sketch(radius, sigma) @endverbatim
- @verbatim Image#sketch(radius, sigma, angle) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default angle is 0.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 12438

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

#solarize(*args) ⇒ 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.

Ruby usage:

- @verbatim Image#solarize @endverbatim
- @verbatim Image#solarize(threshold) @endverbatim

Notes:

- Default threshold is 50.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12464

VALUE
Image_solarize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double threshold = 50.0;

    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);

    (void) SolarizeImage(new_image, threshold);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#sparse_color(*args) ⇒ Object

Call SparseColorInterpolate.

Ruby usage:

- @verbatim Image#sparse_color(method, x1, y1, color) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color, ...) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, channel) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color, channel) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color, ..., channel) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, channel, ...) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color, channel, ...) @endverbatim
- @verbatim Image#sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) @endverbatim

Notes:

- Default channel is AllChannels
- As usual, 'color' can be either a color name or a pixel

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12612

VALUE
Image_sparse_color(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_SPARSECOLORIMAGE)
    Image *image, *new_image;
    unsigned long x, nargs, ncolors;
    SparseColorMethod method;
    int n, exp;
    double * volatile args;
    ChannelType channels;
    MagickPixelPacket 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 - 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)
    {
        args[x++] = NUM2DBL(argv[n++]);
        args[x++] = NUM2DBL(argv[n++]);
        Color_to_MagickPixelPacket(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)
        {
            args[x++] = pp.opacity / QuantumRange;
        }
    }

    exception = AcquireExceptionInfo();
    new_image = SparseColorImage(image, channels, method, nargs, args, exception);
    xfree(args);
    CHECK_EXCEPTION();
    rm_ensure_result(new_image);

    RB_GC_GUARD(args);

    return rm_image_new(new_image);

#else
    self = self;
    argc = argc;
    argv = argv;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#splice(*args) ⇒ Object

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.

Ruby usage:

- @verbatim Image#splice(x, y, width, height) @endverbatim
- @verbatim Image#splice(x, y, width, height, color) @endverbatim

Notes:

- Default color is the background color.
- Splice is the inverse of chop

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:

  • Image_chop

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# File 'ext/RMagick/rmimage.c', line 12723

VALUE
Image_splice(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelPacket 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 PixelPacket
            Color_to_PixelPacket(&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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#spread(*args) ⇒ Object

Randomly displace each pixel in a block defined by “radius”.

Ruby usage:

- @verbatim Image#spread @endverbatim
- @verbatim Image#spread(radius) @endverbatim

Notes:

- Default radius is 3.0

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12786

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();
    new_image = SpreadImage(image, radius, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    rm_ensure_result(new_image);

    (void) DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#steganoObject

#stereo(offset_image_arg) ⇒ Object

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.

Ruby usage:

- @verbatim Image#stereo(offset_image) @endverbatim

Parameters:

  • self

    this object

  • offset_image_arg

    the other image

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 12872

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);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    RB_GC_GUARD(offset_image);

    return rm_image_new(new_image);
}

#store_pixels(x_arg, y_arg, cols_arg, rows_arg, new_pixels) ⇒ Object

Replace the pixels in the specified rectangle.

Ruby usage:

- @verbatim Image#store_pixels(x,y,cols,rows,new_pixels) @endverbatim

Notes:

- Calls GetImagePixels, then SyncImagePixels after replacing the pixels.
- This is the complement of get_pixels. The array object returned by
  get_pixels is suitable for use as the "new_pixels" argument.

Parameters:

  • self

    this object

  • x_arg

    x position of start of region

  • y_arg

    y position of start of region

  • cols_arg

    width of region

  • rows_arg

    height of region

  • new_pixels

    the replacing pixels

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 12980

VALUE
Image_store_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg
                   , VALUE rows_arg, VALUE new_pixels)
{
    Image *image;
    Pixel *pixels, *pixel;
    VALUE new_pixel;
    long n, size;
    long x, y;
    unsigned long cols, rows;
    unsigned int okay;

    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);
    rm_check_ary_len(new_pixels, size);

    okay = SetImageStorageClass(image, DirectClass);
    rm_check_image_exception(image, RetainOnError);
    if (!okay)
    {
        rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
    }

    // Get a pointer to the pixels. Replace the values with the PixelPackets
    // from the pixels argument.
    {
#if defined(HAVE_SYNCAUTHENTICPIXELS) || defined(HAVE_GETAUTHENTICPIXELS)
        ExceptionInfo *exception;
        exception = AcquireExceptionInfo();
#endif

#if defined(HAVE_GETAUTHENTICPIXELS)
        pixels = GetAuthenticPixels(image, x, y, cols, rows, exception);
        CHECK_EXCEPTION()
#else
        pixels = GetImagePixels(image, x, y, cols, rows);
        rm_check_image_exception(image, RetainOnError);
#endif

        if (pixels)
        {
            for (n = 0; n < size; n++)
            {
                new_pixel = rb_ary_entry(new_pixels, n);
                Data_Get_Struct(new_pixel, Pixel, pixel);
                pixels[n] = *pixel;
            }
#if defined(HAVE_SYNCAUTHENTICPIXELS)
            SyncAuthenticPixels(image, exception);
            CHECK_EXCEPTION()
#else
            SyncImagePixels(image);
            rm_check_image_exception(image, RetainOnError);
#endif
        }

#if defined(HAVE_SYNCAUTHENTICPIXELS) || defined(HAVE_GETAUTHENTICPIXELS)
        DestroyExceptionInfo(exception);
#endif
    }

    RB_GC_GUARD(new_pixel);

    return self;
}

#strip!Object

Strips an image of all profiles and comments.

Ruby usage:

- @verbatim Image#strip! @endverbatim

Parameters:

  • self

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 13067

VALUE
Image_strip_bang(VALUE self)
{
    Image *image = rm_check_frozen(self);
    (void) StripImage(image);
    rm_check_image_exception(image, RetainOnError);
    return self;
}

#swirl(degrees) ⇒ Object

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.

Ruby usage:

- @verbatim Image#swirl(degrees) @endverbatim

Parameters:

  • self

    this object

  • degrees

    the degrees

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 13089

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

    image = rm_check_destroyed(self);

    exception = AcquireExceptionInfo();
    new_image = SwirlImage(image, NUM2DBL(degrees), exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#sync_profilesObject

Synchronize image properties with the image profiles.

Ruby usage:

- @verbatim Image#sync_profiles @endverbatim

Parameters:

  • self

    this object

Returns:

  • true if succeeded, otherwise false


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# File 'ext/RMagick/rmimage.c', line 13118

VALUE
Image_sync_profiles(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    VALUE okay =  SyncImageProfiles(image) ? Qtrue : Qfalse;
    rm_check_image_exception(image, RetainOnError);

    RB_GC_GUARD(okay);

    return okay;
}

#texture_fill_to_border(x, y, texture) ⇒ Object

Replace neighboring pixels to border color with texture pixels


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# File 'lib/rmagick_internal.rb', line 1022

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) ⇒ Object

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.'

Ruby usage:

- @verbatim Image#texture_flood_fill(color, texture, x, y, method) @endverbatim

Parameters:

  • self

    this object

  • color_obj

    the color

  • texture_obj

    the texture to fill

  • x_obj

    the x position

  • y_obj

    the y position

  • method_obj

    the method to call (FloodfillMethod or FillToBorderMethod)

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 13152

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;
    PixelPacket color;
    VALUE texture;
    DrawInfo *draw_info;
    long x, y;
    PaintMethod method;

    image = rm_check_destroyed(self);

    Color_to_PixelPacket(&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 %lux%lu"
                 , 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);


#if defined(HAVE_FLOODFILLPAINTIMAGE)
    {
        MagickPixelPacket color_mpp;
        MagickBooleanType invert;

        GetMagickPixelPacket(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;
        }

        (void) FloodfillPaintImage(new_image, DefaultChannels, draw_info, &color_mpp, x, y, invert);
    }

#else
    (void) ColorFloodfillImage(new_image, draw_info, color, x, y, method);
#endif

    (void) DestroyDrawInfo(draw_info);
    rm_check_image_exception(new_image, DestroyOnError);

    RB_GC_GUARD(texture);

    return rm_image_new(new_image);
}

#texture_floodfill(x, y, texture) ⇒ Object

Replace matching neighboring pixels with texture pixels


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

def texture_floodfill(x, y, texture)
  target = pixel_color(x, y)
  texture_flood_fill(target, texture, x, y, FloodfillMethod)
end

#threshold(threshold) ⇒ Object

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.

Ruby usage:

- @verbatim Image#threshold(threshold) @endverbatim

Parameters:

  • self

    this object

  • threshold

    the threshold

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 13244

VALUE
Image_threshold(VALUE self, VALUE threshold)
{
    Image *image, *new_image;

    image = rm_check_destroyed(self);
    new_image = rm_clone_image(image);

    (void) BilevelImageChannel(new_image, DefaultChannels, NUM2DBL(threshold));
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}

#thumbnail(*args) ⇒ Object

Fast resize for thumbnail images.

Ruby usage:

- @verbatim Image#thumbnail(scale) @endverbatim
- @verbatim Image#thumbnail(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image

See Also:


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# File 'ext/RMagick/rmimage.c', line 13405

VALUE
Image_thumbnail(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return thumbnail(False, argc, argv, self);
}

#thumbnail!(*args) ⇒ Object

Fast resize for thumbnail images.

Ruby usage:

- @verbatim Image#thumbnail!(scale) @endverbatim
- @verbatim Image#thumbnail!(cols, rows) @endverbatim

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • self

See Also:


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# File 'ext/RMagick/rmimage.c', line 13427

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

#tint(*args) ⇒ Object

Call TintImage.

Ruby usage:

- @verbatim Image#tint(tint, red_opacity) @endverbatim
- @verbatim Image#tint(tint, red_opacity, green_opacity) @endverbatim
- @verbatim Image#tint(tint, red_opacity, green_opacity, blue_opacity) @endverbatim
- @verbatim Image#tint(tint, red_opacity, green_opacity, blue_opacity, alpha_opacity) @endverbatim

Notes:

- Default green_opacity is red_opacity
- Default blue_opacity is red_opacity
- Default alpha_opacity is 1.0
- Opacity values are percentages: 0.10 -> 10%.

Parameters:

  • argc

    number of input arguments

  • argv

    array of input arguments

  • self

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 13491

VALUE
Image_tint(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    Pixel *tint;
    double red_pct_opaque, green_pct_opaque, blue_pct_opaque;
    double alpha_pct_opaque = 1.0;
    char opacity[50];
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = blue_pct_opaque = red_pct_opaque;
            break;
        case 3:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = NUM2DBL(argv[2]);
            blue_pct_opaque  = red_pct_opaque;
            break;
        case 4:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            break;
        case 5:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            alpha_pct_opaque   = NUM2DBL(argv[4]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 5)", argc);
            break;
    }

    if (red_pct_opaque < 0.0 || green_pct_opaque < 0.0
        || blue_pct_opaque < 0.0 || alpha_pct_opaque < 0.0)
    {
        rb_raise(rb_eArgError, "opacity percentages must be non-negative.");
    }

#if defined(HAVE_SNPRINTF)
    snprintf(opacity, sizeof(opacity),
#else
    sprintf(opacity,
#endif
            "%g,%g,%g,%g", red_pct_opaque*100.0, green_pct_opaque*100.0
            , blue_pct_opaque*100.0, alpha_pct_opaque*100.0);

    Data_Get_Struct(argv[0], Pixel, tint);
    exception = AcquireExceptionInfo();

    new_image = TintImage(image, opacity, *tint, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Return a "blob" (a String) from the image.
 *
 * Ruby usage:
 *   - @verbatim Image#to_blob @endverbatim
 *
 * Notes:
 *   - The magick member of the Image structure determines the format of the
 *     returned blob (GIG, JPEG,  PNG, etc.)
 *
 * @param self this object
 * @return the blob
 */
VALUE
Image_to_blob(VALUE self)
{
    Image *image;
    Info *info;
    const MagickInfo *magick_info;
    VALUE info_obj;
    VALUE blob_str;
    void *blob = NULL;
    size_t length = 2048;       // Do what Magick++ does
    ExceptionInfo *exception;

    // The user can specify the depth (8 or 16, if the format supports
    // both) and the image format by setting the depth and format
    // values in the info parm block.
    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);

    image = rm_check_destroyed(self);

    // Copy the depth and magick fields to the Image
    if (info->depth != 0)
    {
        (void) SetImageDepth(image, info->depth);
        rm_check_image_exception(image, RetainOnError);
    }

    exception = AcquireExceptionInfo();
    if (*info->magick)
    {
        (void) SetImageInfo(info, MagickTrue, exception);
        CHECK_EXCEPTION()

        if (*info->magick == '\0')
        {
            return Qnil;
        }
        strncpy(image->magick, info->magick, sizeof(info->magick)-1);
    }

    // Fix #2844 - libjpeg exits when image is 0x0
    magick_info = GetMagickInfo(image->magick, exception);
    CHECK_EXCEPTION()

    if (magick_info)
    {
        if (  (!rm_strcasecmp(magick_info->name, "JPEG")
               || !rm_strcasecmp(magick_info->name, "JPG"))
              && (image->rows == 0 || image->columns == 0))
        {
            rb_raise(rb_eRuntimeError, "Can't convert %lux%lu %.4s image to a blob"
                     , image->columns, image->rows, magick_info->name);
        }
    }

    rm_sync_image_options(image, info);

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

    (void) DestroyExceptionInfo(exception);

    if (length == 0 || !blob)
    {
        return Qnil;
    }

    blob_str = rb_str_new(blob, length);

    magick_free((void*)blob);

    RB_GC_GUARD(info_obj);
    RB_GC_GUARD(blob_str);

    return blob_str;
}


/**
 * Return a color name for the color intensity specified by the Magick::Pixel
 * argument.
 *
 * Ruby usage:
 *   - @verbatim Image#to_color(pixel) @endverbatim
 *
 * Notes:
 *   - Respects depth and matte attributes
 *
 * @param self this object
 * @param pixel_arg the pixel
 * @return the color name
 */
VALUE
Image_to_color(VALUE self, VALUE pixel_arg)
{
    Image *image;
    Pixel *pixel;
    ExceptionInfo *exception;
    char name[MaxTextExtent];

    image = rm_check_destroyed(self);
    Data_Get_Struct(pixel_arg, Pixel, pixel);
    exception = AcquireExceptionInfo();

    // QueryColorname returns False if the color represented by the PixelPacket
    // doesn't have a "real" name, just a sequence of hex digits. We don't care
    // about that.

    name[0] = '\0';
    (void) QueryColorname(image, pixel, AllCompliance, name, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    return rb_str_new2(name);

}


/**
 * Alias for Image#number_colors.
 *
 * Ruby usage:
 *   - @verbatim Image#total_colors @endverbatim
 *
 * Notes:
 *   - This used to be a direct reference to the `total_colors' field in Image
 *     but that field is not reliable.
 *
 * @param self this object
 * @return number of unique colors
 * @see Image_number_colors
 */
VALUE
Image_total_colors(VALUE self)
{
    return Image_number_colors(self);
}


/**
 * Return value from GetImageTotalInkDensity.
 *
 * Ruby usage:
 *   - @verbatim Image#total_ink_density @endverbatim
 *
 * Notes:
 *   - Raises an exception if the image is not CMYK
 *
 * @param self this object
 * @return the total ink density
 */
VALUE
Image_total_ink_density(VALUE self)
{
    Image *image;
    double density;

    image = rm_check_destroyed(self);
    density = GetImageTotalInkDensity(image);
    rm_check_image_exception(image, RetainOnError);
    return rb_float_new(density);
}


/**
 * Call TransparentPaintImage.
 *
 * Ruby usage:
 *   - @verbatim Image#transparent(color-name) @endverbatim
 *   - @verbatim Image#transparent(color-name, opacity) @endverbatim
 *   - @verbatim Image#transparent(pixel) @endverbatim
 *   - @verbatim Image#transparent(pixel, opacity) @endverbatim
 *
 * Notes:
 *   - Default opacity is Magick::TransparentOpacity.
 *   - Can use Magick::OpaqueOpacity or Magick::TransparentOpacity, or any
 *     value >= 0 && <= QuantumRange.
 *   - Use Image#fuzz= to define the tolerance level.
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 */
VALUE
Image_transparent(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickPixelPacket color;
    Quantum opacity = TransparentOpacity;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            opacity = APP2QUANTUM(argv[1]);
        case 1:
            Color_to_MagickPixelPacket(image, &color, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

    new_image = rm_clone_image(image);

#if defined(HAVE_TRANSPARENTPAINTIMAGE)
    okay = TransparentPaintImage(new_image, &color, opacity, MagickFalse);
#else
    okay = PaintTransparentImage(new_image, &color, opacity);
#endif
    rm_check_image_exception(new_image, DestroyOnError);
    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_magick_error("TransparentPaintImage failed with no explanation", NULL);
    }

    return rm_image_new(new_image);
}


/**
 * Call TransparentPaintImageChroma.
 *
 * Ruby usage:
 *   - @verbatim Image#transparent_chroma(low, high) @endverbatim
 *   - @verbatim Image#transparent_chroma(low, high, opacity) @endverbatim
 *   - @verbatim Image#transparent_chroma(low, high, opacity, invert) @endverbatim
 *
 * Notes:
 *   - Default opacity is TransparentOpacity
 *   - Default invert is false
 *   - Available in ImageMagick >= 6.4.5-6
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 */
VALUE
Image_transparent_chroma(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_TRANSPARENTPAINTIMAGECHROMA)
    Image *image, *new_image;
    Quantum opacity = TransparentOpacity;
    MagickPixelPacket low, high;
    MagickBooleanType invert = MagickFalse;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 4:
            invert = RTEST(argv[3]);
        case 3:
            opacity = APP2QUANTUM(argv[2]);
        case 2:
            Color_to_MagickPixelPacket(image, &high, argv[1]);
            Color_to_MagickPixelPacket(image, &low, argv[0]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2, 3 or 4)", argc);
            break;
    }

    new_image = rm_clone_image(image);

    okay = TransparentPaintImageChroma(new_image, &low, &high, opacity, invert);
    rm_check_image_exception(new_image, DestroyOnError);
    if (!okay)
    {
        // Force exception
        DestroyImage(new_image);
        rm_magick_error("TransparentPaintImageChroma failed with no explanation", NULL);
    }

    return rm_image_new(new_image);
#else
    rm_not_implemented();
    return (VALUE)0;
    argc = argc;
    argv = argv;
    self = self;
#endif
}


/**
 * Return the name of the transparent color as a String.
 *
 * Ruby usage:
 *   - @verbatim Image#transparent_color @endverbatim
 *
 * @param self this object
 * @return the name of the transparent color
 */
VALUE
Image_transparent_color(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return rm_pixelpacket_to_color_name(image, &image->transparent_color);
}


/**
 * Set the the transparent color to the specified color spec.
 *
 * Ruby usage:
 *   - @verbatim Image#transparent_color= @endverbatim
 *
 * @param self this object
 * @param color the transparent color
 * @return self
 */
VALUE
Image_transparent_color_eq(VALUE self, VALUE color)
{
    Image *image = rm_check_frozen(self);
    Color_to_PixelPacket(&image->transparent_color, color);
    return self;
}


/**
 * Call TransposeImage.
 *
 * Ruby usage:
 *   - @verbatim Image#transpose @endverbatim
 *
 * @param self this object
 * @return a new image
 * @see crisscross
 * @see Image_transpose_bang
 */
VALUE
Image_transpose(VALUE self)
{
    (void) rm_check_destroyed(self);
    return crisscross(False, self, TransposeImage);
}


/**
 * Call TransposeImage.
 *
 * Ruby usage:
 *   - @verbatim Image#transpose! @endverbatim
 *
 * @param self this object
 * @return self
 * @see crisscross
 * @see Image_transpose
 */
VALUE
Image_transpose_bang(VALUE self)
{
    (void) rm_check_frozen(self);
    return crisscross(True, self, TransposeImage);
}


/**
 * Call TransverseImage.
 *
 * Ruby usage:
 *   - @verbatim Image#transverse @endverbatim
 *
 * @param self this object
 * @return a new image
 * @see crisscross
 * @see Image_transverse_bang
 */
VALUE
Image_transverse(VALUE self)
{
    (void) rm_check_destroyed(self);
    return crisscross(False, self, TransverseImage);
}

/**
 * Call TransverseImage.
 *
 * Ruby usage:
 *   - @verbatim Image#transverse! @endverbatim
 *
 * @param self this object
 * @return self
 * @see crisscross
 * @see Image_transverse_bang
 */
VALUE
Image_transverse_bang(VALUE self)
{
    (void) rm_check_frozen(self);
    return crisscross(True, self, TransverseImage);
}


/**
 * Convenient front-end to CropImage.
 *
 * No Ruby usage (internal function)
 *
 * Notes:
 *   - Respects fuzz attribute.
 *
 * @param bang whether the bang (!) version of the method was called
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return self if bang, otherwise a new image
 * @see Image_trim
 * @see Image_trim_bang
 */
static VALUE
trimmer(int bang, int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    int reset_page = 0;

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

    Data_Get_Struct(self, Image, image);

    exception = AcquireExceptionInfo();
    new_image = TrimImage(image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    if (reset_page)
    {
        ResetImagePage(new_image, "0x0+0+0");
    }

    if (bang)
    {
        UPDATE_DATA_PTR(self, new_image);
        (void) rm_image_destroy(image);
        return self;
    }

    return rm_image_new(new_image);
}


/**
 * Convenient front-end to CropImage.
 *
 * Ruby usage:
 *   - @verbatim Image#trim @endverbatim
 *   - @verbatim Image#trim(reset_page) @endverbatim
 *
 * Notes:
 *   - Default reset_page is false
 *   - Respects fuzz attribute.
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 * @see trimmer
 * @see Image_trim_bang
 */
VALUE
Image_trim(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_destroyed(self);
    return trimmer(False, argc, argv, self);
}


/**
 * Convenient front-end to CropImage.
 *
 * Ruby usage:
 *   - @verbatim Image#trim! @endverbatim
 *   - @verbatim Image#trim!(reset_page) @endverbatim
 *
 * Notes:
 *   - Default reset_page is false
 *   - Respects fuzz attribute.
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return self
 * @see trimmer
 * @see Image_trim
 */
VALUE
Image_trim_bang(int argc, VALUE *argv, VALUE self)
{
    (void) rm_check_frozen(self);
    return trimmer(True, argc, argv, self);
}


/**
 * Get the image gravity attribute.
 *
 * Ruby usage:
 *   - @verbatim Image#gravity @endverbatim
 *
 * @param self this object
 * @return the image gravity
 */
VALUE Image_gravity(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return GravityType_new(image->gravity);
}


/**
 * Set the image gravity attribute.
 *
 * Ruby usage:
 *   - @verbatim Image#gravity= @endverbatim
 *
 * @param self this object
 * @param gravity the image gravity
 * @return the image gravity
 */
VALUE Image_gravity_eq(VALUE self, VALUE gravity)
{
    Image *image = rm_check_frozen(self);
    VALUE_TO_ENUM(gravity, image->gravity, GravityType);
    return gravity;
}


/**
 * Call GetImageType to get the image type.
 *
 * Ruby usage:
 *   - @verbatim Image#image_type @endverbatim
 *
 * @param self this object
 * @return the image type
 */
VALUE Image_image_type(VALUE self)
{
    Image *image;
    ImageType type;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();
    type = GetImageType(image, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    return ImageType_new(type);
}


/**
 * Call SetImageType to set the image type.
 *
 * Ruby usage:
 *   - @verbatim Image#image_type= @endverbatim
 *
 * @param self this object
 * @param image_type the image type
 * @return the image type
 */
VALUE Image_image_type_eq(VALUE self, VALUE image_type)
{
    Image *image;
    ImageType type;

    image = rm_check_frozen(self);
    VALUE_TO_ENUM(image_type, type, ImageType);
    SetImageType(image, type);
    return image_type;
}


/**
 * Call RemoveImageArtifact.
 *
 * Ruby usage:
 *   - @verbatim Image#undefine(artifact) @endverbatim
 *
 * Notes:
 *   - Normally a script should never call this method.
 *
 * @param self this object
 * @param artifact the artifact
 * @return self
 * @see Image_define
 */
VALUE
Image_undefine(VALUE self, VALUE artifact)
{
#if defined(HAVE_REMOVEIMAGEARTIFACT)
    Image *image;
    char *key;
    long key_l;

    image = rm_check_frozen(self);
    key = rm_str2cstr(artifact, &key_l);
    (void) RemoveImageArtifact(image, key);
    return self;
#else
    rm_not_implemented();
    artifact = artifact;
    self = self;
    return(VALUE)0;
#endif
}


/**
 * Call UniqueImageColors.
 *
 * Ruby usage:
 *   - @verbatim Image#unique_colors @endverbatim
 *
 * @param self this object
 * @return a new image
 */
VALUE
Image_unique_colors(VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;

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

    new_image = UniqueImageColors(image, exception);
    rm_check_exception(exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Get the resolution type field.
 *
 * Ruby usage:
 *   - @verbatim Image#units @endverbatim
 *
 * @param self this object
 * @return the resolution type
 */
VALUE
Image_units(VALUE self)
{
    Image *image = rm_check_destroyed(self);
    return ResolutionType_new(image->units);
}


/**
 * Set the resolution type field.
 *
 * Ruby usage:
 *   - @verbatim Image#units= @endverbatim
 *
 * @param self this object
 * @param restype the resolution type
 * @return self
 */
VALUE
Image_units_eq(VALUE self, VALUE restype)
{
    ResolutionType units;
    Image *image = rm_check_frozen(self);

    VALUE_TO_ENUM(restype, units, ResolutionType);

    if (image->units != units)
    {
        switch (image->units)
        {
            case PixelsPerInchResolution:
                if (units == PixelsPerCentimeterResolution)
                {
                    image->x_resolution /= 2.54;
                    image->y_resolution /= 2.54;
                }
                break;

            case PixelsPerCentimeterResolution:
                if (units == PixelsPerInchResolution)
                {
                    image->x_resolution *= 2.54;
                    image->y_resolution *= 2.54;
                }
                break;

            default:
                // UndefinedResolution
                image->x_resolution = 0.0;
                image->y_resolution = 0.0;
                break;
        }

        image->units = units;
    }

    return self;
}


/**
 * Sharpen an image. "amount" is the percentage of the difference between the
 * original and the blur image that is added back into the original. "threshold"
 * is the threshold in pixels needed to apply the diffence amount.
 *
 * No Ruby usage (internal function)
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param radious the radious
 * @param sigma the sigma
 * @param amount the amount
 * @param threshold the threshold
 * @see Image_unsharp_mask
 */
static void
unsharp_mask_args(int argc, VALUE *argv, double *radius, double *sigma
                  , double *amount, double *threshold)
{
    switch (argc)
    {
        case 4:
            *threshold = NUM2DBL(argv[3]);
            if (*threshold < 0.0)
            {
                rb_raise(rb_eArgError, "threshold must be >= 0.0");
            }
        case 3:
            *amount = NUM2DBL(argv[2]);
            if (*amount <= 0.0)
            {
                rb_raise(rb_eArgError, "amount must be > 0.0");
            }
        case 2:
            *sigma = NUM2DBL(argv[1]);
            if (*sigma == 0.0)
            {
                rb_raise(rb_eArgError, "sigma must be != 0.0");
            }
        case 1:
            *radius = NUM2DBL(argv[0]);
            if (*radius < 0.0)
            {
                rb_raise(rb_eArgError, "radius must be >= 0.0");
            }
        case 0:
            break;

            // This case can't occur if we're called from Image_unsharp_mask_channel
            // because it has already raised an exception for the the argc > 4 case.
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
    }
}


/**
 * Sharpen an image. "amount" is the percentage of the difference between the
 * original and the blur image that is added back into the original. "threshold"
 * is the threshold in pixels needed to apply the diffence amount.
 *
 * Ruby usage:
 *   - @verbatim Image#unsharp_mask @endverbatim
 *   - @verbatim Image#unsharp_mask(radius) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount, threshold) @endverbatim
 *
 * Notes:
 *   - Default radius is 0.0
 *   - Default sigma is 1.0
 *   - Default amount is 1.0
 *   - Default threshold is 0.05
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 * @see unsharp_mask_args
 */
VALUE
Image_unsharp_mask(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);

    exception = AcquireExceptionInfo();
    new_image = UnsharpMaskImage(image, radius, sigma, amount, threshold, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Call UnsharpMaskImageChannel.
 *
 * Ruby usage:
 *   - @verbatim Image#unsharp_mask @endverbatim
 *   - @verbatim Image#unsharp_mask(radius) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount, threshold) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount, threshold, channel) @endverbatim
 *   - @verbatim Image#unsharp_mask(radius, sigma, amount, threshold, channel, ...) @endverbatim
 *
 * Notes:
 *   - Default radius is 0.0
 *   - Default sigma is 1.0
 *   - Default amount is 1.0
 *   - Default threshold is 0.05
 *   - Default channel is AllChannels
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 * @see unsharp_mask_args
 */
VALUE
Image_unsharp_mask_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ChannelType channels;
    double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);
    if (argc > 4)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);

    exception = AcquireExceptionInfo();
    new_image = UnsharpMaskImageChannel(image, channels, radius, sigma, amount
                                        , threshold, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Soften the edges of an image.
 *
 * Ruby usage:
 *   - @verbatim Image#vignette @endverbatim
 *   - @verbatim Image#vignette(horz_radius) @endverbatim
 *   - @verbatim Image#vignette(horz_radius, vert_radius) @endverbatim
 *   - @verbatim Image#vignette(horz_radius, vert_radius, radius) @endverbatim
 *   - @verbatim Image#vignette(horz_radius, vert_radius, radius, sigma) @endverbatim
 *
 * Notes:
 *   - Default horz_radius is image-columns*0.1+0.5
 *   - Default vert_radius is image-rows*0.1+0.5
 *   - Default radius is 0.0
 *   - Default sigma is 1.0
 *   - The outer edges of the image are replaced by the background color.
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 */
VALUE
Image_vignette(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    long horz_radius, vert_radius;
    double radius = 0.0, sigma = 10.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    horz_radius = (long)(image->columns * 0.10 + 0.5);
    vert_radius = (long)(image->rows * 0.10 + 0.5);

    switch (argc)
    {
        case 4:
            sigma = NUM2DBL(argv[3]);
        case 3:
            radius = NUM2DBL(argv[2]);
        case 2:
            vert_radius = NUM2INT(argv[1]);
        case 1:
            horz_radius = NUM2INT(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
            break;
    }

    exception = AcquireExceptionInfo();

    new_image = VignetteImage(image, radius, sigma, horz_radius, vert_radius, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Get the VirtualPixelMethod for the image.
 *
 * Ruby usage:
 *   - @verbatim Image#virtual_pixel_method @endverbatim
 *
 * @param self this object
 * @return the VirtualPixelMethod
 */
VALUE
Image_virtual_pixel_method(VALUE self)
{
    Image *image;
    VirtualPixelMethod vpm;

    image = rm_check_destroyed(self);
    vpm = GetImageVirtualPixelMethod(image);
    rm_check_image_exception(image, RetainOnError);
    return VirtualPixelMethod_new(vpm);
}


/**
 * Set the virtual pixel method for the image.
 *
 * Ruby usage:
 *   - @verbatim Image#virtual_pixel_method= @endverbatim
 *
 * @param self this object
 * @param method the VirtualPixelMethod
 * @return self
 */
VALUE
Image_virtual_pixel_method_eq(VALUE self, VALUE method)
{
    Image *image;
    VirtualPixelMethod vpm;

    image = rm_check_frozen(self);
    VALUE_TO_ENUM(method, vpm, VirtualPixelMethod);
    (void) SetImageVirtualPixelMethod(image, vpm);
    rm_check_image_exception(image, RetainOnError);
    return self;
}


/**
 * Add a watermark to an image.
 *
 * Ruby usage:
 *   - @verbatim Image#watermark(mark) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation, gravity) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation, gravity, x_off) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation, gravity, x_off, y_off) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation, x_off) @endverbatim
 *   - @verbatim Image#watermark(mark, brightness, saturation, x_off, y_off) @endverbatim
 *
 * Notes:
 *   - Default brightness is 100%
 *   - Default saturation is 100%
 *   - Default x_off is 0
 *   - Default y_off is 0
 *   - x_off and y_off can be negative, which means measure from the
 *     right/bottom of the target image.
 *
 */
VALUE
Image_watermark(int argc, VALUE *argv, VALUE self)
{
    Image *image, *overlay, *new_image;
    double src_percent = 100.0, dst_percent = 100.0;
    long x_offset = 0L, y_offset = 0L;
    char geometry[20];
    VALUE ovly;

    image = rm_check_destroyed(self);

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

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

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

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

    blend_geometry(geometry, sizeof(geometry), src_percent, dst_percent);
    (void) CloneString(&overlay->geometry, geometry);
#if defined(HAVE_SETIMAGEARTIFACT)
    (void) SetImageArtifact(overlay,"compose:args", geometry);
#endif

    new_image = rm_clone_image(image);
    (void) CompositeImage(new_image, ModulateCompositeOp, overlay, x_offset, y_offset);

    rm_check_image_exception(new_image, DestroyOnError);

    RB_GC_GUARD(ovly);

    return rm_image_new(new_image);
}


/**
 * Create a "ripple" effect in the image by shifting the pixels vertically along
 * a sine wave whose amplitude and wavelength is specified by the given
 * parameters.
 *
 * Ruby usage:
 *   - @verbatim Image#wave @endverbatim
 *   - @verbatim Image#wave(amplitude) @endverbatim
 *   - @verbatim Image#wave(amplitude, wavelength) @endverbatim
 *
 * Notes:
 *   - Default amplitude is 25.0
 *   - Default wavelength is 150.0
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 */
VALUE
Image_wave(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double amplitude = 25.0, wavelength = 150.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 2:
            wavelength = NUM2DBL(argv[1]);
        case 1:
            amplitude = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    new_image = WaveImage(image, amplitude, wavelength, exception);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}


/**
 * Construct a "wet floor" reflection.
 *
 * Ruby usage:
 *   - @verbatim Image#wet_floor @endverbatim
 *   - @verbatim Image#wet_floor(initial) @endverbatim
 *   - @verbatim Image#wet_floor(initial, rate) @endverbatim
 *
 * Notes:
 *   - Default initial is 0.5
 *   - Default rate is 1.0
 *   - `initial' is a number between 0 and 1, inclusive, that represents the
 *     initial level of transparency. Smaller numbers are less transparent than
 *     larger numbers. 0 is fully opaque. 1.0 is fully transparent.
 *   - `rate' is the rate at which the initial level of transparency changes to
 *     complete transparency. Larger values cause the change to occur more
 *     rapidly. The resulting reflection will be shorter. Smaller values cause
 *     the change to occur less rapidly. The resulting reflection will be
 *     taller. If the rate is exactly 0 then the amount of transparency doesn't
 *     change at all.
 * 
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 * @see http://en.wikipedia.org/wiki/Wet_floor_effect
 */
VALUE
Image_wet_floor(int argc, VALUE *argv, VALUE self)
{
    Image *image, *reflection, *flip_image;
    const PixelPacket *p;
    PixelPacket *q;
    RectangleInfo geometry;
    long x, y, max_rows;
    double initial = 0.5;
    double rate = 1.0;
    double opacity, step;
    const char *func;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 2:
            rate = NUM2DBL(argv[1]);
        case 1:
            initial = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
            break;
    }


    if (initial < 0.0 || initial > 1.0)
    {
        rb_raise(rb_eArgError, "Initial transparency must be in the range 0.0-1.0 (%g)", initial);
    }
    if (rate < 0.0)
    {
        rb_raise(rb_eArgError, "Transparency change rate must be >= 0.0 (%g)", rate);
    }

    initial *= TransparentOpacity;

    // The number of rows in which to transition from the initial level of
    // transparency to complete transparency. rate == 0.0 -> no change.
    if (rate > 0.0)
    {
        max_rows = (long)((double)image->rows) / (3.0 * rate);
        max_rows = (long)min((unsigned long)max_rows, image->rows);
        step =  (TransparentOpacity - initial) / max_rows;
    }
    else
    {
        max_rows = (long)image->rows;
        step = 0.0;
    }


    exception = AcquireExceptionInfo();
    flip_image = FlipImage(image, exception);
    CHECK_EXCEPTION();


    geometry.x = 0;
    geometry.y = 0;
    geometry.width = image->columns;
    geometry.height = max_rows;
    reflection = CropImage(flip_image, &geometry, exception);
    DestroyImage(flip_image);
    CHECK_EXCEPTION();


    (void) SetImageStorageClass(reflection, DirectClass);
    rm_check_image_exception(reflection, DestroyOnError);


    reflection->matte = MagickTrue;
    opacity = initial;

    for (y = 0; y < max_rows; y++)
    {
        if (opacity > TransparentOpacity)
        {
            opacity = TransparentOpacity;
        }


#if defined(HAVE_GETVIRTUALPIXELS)
        p = GetVirtualPixels(reflection, 0, y, image->columns, 1, exception);
#else
        p = AcquireImagePixels(reflection, 0, y, image->columns, 1, exception);
#endif
        rm_check_exception(exception, reflection, DestroyOnError);
        if (!p)
        {
            func = "AcquireImagePixels";
            goto error;
        }

#if defined(HAVE_QUEUEAUTHENTICPIXELS)
        q = QueueAuthenticPixels(reflection, 0, y, image->columns, 1, exception);
#else
        q = SetImagePixels(reflection, 0, y, image->columns, 1);
#endif
        rm_check_exception(exception, reflection, DestroyOnError);
        if (!q)
        {
            func = "SetImagePixels";
            goto error;
        }

        for (x = 0; x < (long) image->columns; x++)
        {
            q[x] = p[x];
            // Never make a pixel *less* transparent than it already is.
            q[x].opacity = max(q[x].opacity, (Quantum)opacity);
        }


#if defined(HAVE_SYNCAUTHENTICPIXELS)
        SyncAuthenticPixels(reflection, exception);
        rm_check_exception(exception, reflection, DestroyOnError);
#else
        SyncImagePixels(reflection);
        rm_check_image_exception(reflection, DestroyOnError);
#endif

        opacity += step;
    }


    (void) DestroyExceptionInfo(exception);
    return rm_image_new(reflection);

    error:
    (void) DestroyExceptionInfo(exception);
    (void) DestroyImage(reflection);
    rb_raise(rb_eRuntimeError, "%s failed on row %lu", func, y);
    return(VALUE)0;
}


/**
 * Call WhiteThresholdImage.
 *
 * Ruby usage:
 *   - @verbatim Image#white_threshold(red_channel) @endverbatim
 *   - @verbatim Image#white_threshold(red_channel, green_channel) @endverbatim
 *   - @verbatim Image#white_threshold(red_channel, green_channel, blue_channel) @endverbatim
 *   - @verbatim Image#white_threshold(red_channel, green_channel, blue_channel, opacity_channel) @endverbatim
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return a new image
 * @see threshold_image
 * @see Image_black_threshold
 */
VALUE
Image_white_threshold(int argc, VALUE *argv, VALUE self)
{
    return threshold_image(argc, argv, self, WhiteThresholdImage);
}


/**
 * Copy the filename to the Info and to the Image. Add format prefix if
 * necessary. This complicated code is necessary to handle filenames like the
 * kind Tempfile.new produces, which have an "extension" in the form ".n", which
 * confuses SetMagickInfo. So we don't use SetMagickInfo any longer.
 *
 * No Ruby usage (internal function)
 *
 * @param info the Info
 * @param file the file
 */
void add_format_prefix(Info *info, VALUE file)
{
    char *filename;
    long filename_l;
    const MagickInfo *magick_info, *magick_info2;
    ExceptionInfo *exception;
    char magic[MaxTextExtent];
    size_t magic_l;
    size_t prefix_l;
    char *p;

    // Convert arg to string. If an exception occurs raise an error condition.
    file = rb_rescue(rb_String, file, file_arg_rescue, file);

    filename = rm_str2cstr(file, &filename_l);

    if (*info->magick == '\0')
    {
        memset(info->filename, 0, sizeof(info->filename));
        memcpy(info->filename, filename, (size_t)min(filename_l, MaxTextExtent-1));
        return;
    }

    // If the filename starts with a prefix, and it's a valid image format
    // prefix, then check for a conflict. If it's not a valid format prefix,
    // ignore it.
    p = memchr(filename, ':', (size_t)filename_l);
    if (p)
    {
        memset(magic, '\0', sizeof(magic));
        magic_l = p - filename;
        memcpy(magic, filename, magic_l);

        exception = AcquireExceptionInfo();
        magick_info = GetMagickInfo(magic, exception);
        CHECK_EXCEPTION();
        DestroyExceptionInfo(exception);

        if (magick_info && magick_info->module)
        {
            // We have to compare the module names because some formats have
            // more than one name. JPG and JPEG, for example.
            exception = AcquireExceptionInfo();
            magick_info2 = GetMagickInfo(info->magick, exception);
            CHECK_EXCEPTION();
            DestroyExceptionInfo(exception);

            if (magick_info2->module && strcmp(magick_info->module, magick_info2->module) != 0)
            {
                rb_raise(rb_eRuntimeError
                         , "filename prefix `%s' conflicts with output format `%s'"
                         , magick_info->name, info->magick);
            }

            // The filename prefix already matches the specified format.
            // Just copy the filename as-is.
            memset(info->filename, 0, sizeof(info->filename));
            filename_l = min((size_t)filename_l, sizeof(info->filename));
            memcpy(info->filename, filename, (size_t)filename_l);
            return;
        }
    }

    // The filename doesn't start with a format prefix. Add the format from
    // the image info as the filename prefix.

    memset(info->filename, 0, sizeof(info->filename));
    prefix_l = min(sizeof(info->filename)-1, strlen(info->magick));
    memcpy(info->filename, info->magick, prefix_l);
    info->filename[prefix_l++] = ':';

    filename_l = min(sizeof(info->filename) - prefix_l - 1, (size_t)filename_l);
    memcpy(info->filename+prefix_l, filename, (size_t)filename_l);
    info->filename[prefix_l+filename_l] = '\0';

    return;
}


/**
 * Write the image to the file.
 *
 * Ruby usage:
 *   - @verbatim Image#write(filename) @endverbatim
 *
 * @param self this object
 * @param file the filename
 * @return self
 */
VALUE
Image_write(VALUE self, VALUE file)
{
    Image *image;
    Info *info;
    VALUE info_obj;

    image = rm_check_destroyed(self);

    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);

    if (TYPE(file) == T_FILE)
    {
        OpenFile *fptr;

        // Ensure file is open - raise error if not
        GetOpenFile(file, fptr);
        rb_io_check_writable(fptr);
#if defined(_WIN32)
        add_format_prefix(info, fptr->pathv);
        strcpy(image->filename, info->filename);
        SetImageInfoFile(info, NULL);
#else
        SetImageInfoFile(info, GetWriteFile(fptr));
        memset(image->filename, 0, sizeof(image->filename));
#endif
    }
    else
    {
        add_format_prefix(info, file);
        strcpy(image->filename, info->filename);
        SetImageInfoFile(info, NULL);
    }

    rm_sync_image_options(image, info);

    info->adjoin = MagickFalse;
    (void) WriteImage(info, image);
    rm_check_image_exception(image, RetainOnError);

    RB_GC_GUARD(info_obj);

    return self;
}


DEF_ATTR_ACCESSOR(Image, x_resolution, dbl)

DEF_ATTR_ACCESSOR(Image, y_resolution, dbl)


/**
 * Determine if the argument list is x, y, width, height
 * or
 * gravity, width, height
 * or
 * gravity, x, y, width, height
 *
 * If the 2nd or 3rd, compute new x, y values.
 *
 * The argument list can have a trailing true, false, or nil argument. If
 * present and true, after cropping reset the page fields in the image.
 *
 * No Ruby usage (internal function)
 *
 * Notes:
 *   - Call xform_image to do the cropping.
 *
 * @param bang whether the bang (!) version of the method was called
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @param self this object
 * @return self if bang, otherwise a new image
 * @see xform_image
 */
static VALUE
cropper(int bang, int argc, VALUE *argv, VALUE self)
{
    VALUE x, y, width, height;
    unsigned long nx = 0, ny = 0;
    unsigned long columns, rows;
    int reset_page = 0;
    GravityType gravity;
    Image *image;
    VALUE cropped;

    // Check for a "reset page" trailing argument.
    if (argc >= 1)
    {
        switch (TYPE(argv[argc-1]))
        {
            case T_TRUE:
                reset_page = 1;
                // fall thru
            case T_FALSE:
            case T_NIL:
                argc -= 1;
            default:
                break;
        }
    }

    switch (argc)
    {
        case 5:
            Data_Get_Struct(self, Image, image);

            VALUE_TO_ENUM(argv[0], gravity, GravityType);

            x      = argv[1];
            y      = argv[2];
            width  = argv[3];
            height = argv[4];

            nx      = NUM2ULONG(x);
            ny      = NUM2ULONG(y);
            columns = NUM2ULONG(width);
            rows    = NUM2ULONG(height);

            switch (gravity)
            {
                case NorthEastGravity:
                case EastGravity:
                case SouthEastGravity:
                    nx = image->columns - columns - nx;
                    break;
                case NorthGravity:
                case SouthGravity:
                case CenterGravity:
                case StaticGravity:
                    nx += image->columns/2 - columns/2;
                    break;
                default:
                    break;
            }
            switch (gravity)
            {
                case SouthWestGravity:
                case SouthGravity:
                case SouthEastGravity:
                    ny = image->rows - rows - ny;
                    break;
                case EastGravity:
                case WestGravity:
                case CenterGravity:
                case StaticGravity:
                    ny += image->rows/2 - rows/2;
                    break;
                case NorthEastGravity:
                case NorthGravity:
                default:
                    break;
            }

            x = ULONG2NUM(nx);
            y = ULONG2NUM(ny);
            break;
        case 4:
            x      = argv[0];
            y      = argv[1];
            width  = argv[2];
            height = argv[3];
            break;
        case 3:

            // Convert the width & height arguments to unsigned longs.
            // Compute the x & y offsets from the gravity and then
            // convert them to VALUEs.
            VALUE_TO_ENUM(argv[0], gravity, GravityType);
            width   = argv[1];
            height  = argv[2];
            columns = NUM2ULONG(width);
            rows    = NUM2ULONG(height);

            Data_Get_Struct(self, Image, image);

            switch (gravity)
            {
                case ForgetGravity:
                case NorthWestGravity:
                    nx = 0;
                    ny = 0;
                    break;
                case NorthGravity:
                    nx = (image->columns - columns) / 2;
                    ny = 0;
                    break;
                case NorthEastGravity:
                    nx = image->columns - columns;
                    ny = 0;
                    break;
                case WestGravity:
                    nx = 0;
                    ny = (image->rows - rows) / 2;
                    break;
                case EastGravity:
                    nx = image->columns - columns;
                    ny = (image->rows - rows) / 2;
                    break;
                case SouthWestGravity:
                    nx = 0;
                    ny = image->rows - rows;
                    break;
                case SouthGravity:
                    nx = (image->columns - columns) / 2;
                    ny = image->rows - rows;
                    break;
                case SouthEastGravity:
                    nx = image->columns - columns;
                    ny = image->rows - rows;
                    break;
                case StaticGravity:
                case CenterGravity:
                    nx = (image->columns - columns) / 2;
                    ny = (image->rows - rows) / 2;
                    break;
            }

            x = ULONG2NUM(nx);
            y = ULONG2NUM(ny);
            break;
        default:
            if (reset_page)
            {
                rb_raise(rb_eArgError, "wrong number of arguments (%d for 4, 5, or 6)", argc);
            }
            else
            {
                rb_raise(rb_eArgError, "wrong number of arguments (%d for 3, 4, or 5)", argc);
            }
            break;
    }

    cropped = xform_image(bang, self, x, y, width, height, CropImage);
    if (reset_page)
    {
        Data_Get_Struct(cropped, Image, image);
        ResetImagePage(image, "0x0+0+0");
    }

    RB_GC_GUARD(x);
    RB_GC_GUARD(y);
    RB_GC_GUARD(width);
    RB_GC_GUARD(height);

    return cropped;
}


/**
 * Call one of the image transformation functions.
 *
 * No Ruby usage (internal function)
 *
 * @param bang whether the bang (!) version of the method was called
 * @param self this object
 * @param x x position of start of region
 * @param y y position of start of region
 * @param width width of region
 * @param height height of region
 * @param xformer the transformation function
 * @return self if bang, otherwise a new image
 */
static VALUE
xform_image(int bang, VALUE self, VALUE x, VALUE y, VALUE width, VALUE height, xformer_t xformer)
{
    Image *image, *new_image;
    RectangleInfo rect;
    ExceptionInfo *exception;

    Data_Get_Struct(self, Image, image);
    rect.x      = NUM2LONG(x);
    rect.y      = NUM2LONG(y);
    rect.width  = NUM2ULONG(width);
    rect.height = NUM2ULONG(height);

    exception = AcquireExceptionInfo();

    new_image = (xformer)(image, &rect, exception);

    // An exception can occur in either the old or the new images
    rm_check_image_exception(image, RetainOnError);
    rm_check_exception(exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    if (bang)
    {
        UPDATE_DATA_PTR(self, new_image);
        (void) rm_image_destroy(image);
        return self;
    }

    return rm_image_new(new_image);

}


/**
 * Remove all the ChannelType arguments from the end of the argument list.
 *
 * No Ruby usage (internal function)
 *
 * Notes:
 *   - Returns DefaultChannels if no channel arguments were found.
 *   - Returns the number of remaining arguments.
 *
 * @param argc number of input arguments
 * @param argv array of input arguments
 * @return A ChannelType value suitable for passing into an xMagick function.
 */
ChannelType extract_channels(int *argc, VALUE *argv)
{
    VALUE arg;
    ChannelType channels, ch_arg;

    channels = 0;
    while (*argc > 0)
    {
        arg = argv[(*argc)-1];

        // Stop when you find a non-ChannelType argument
        if (CLASS_OF(arg) != Class_ChannelType)
        {
            break;
        }
        VALUE_TO_ENUM(arg, ch_arg, ChannelType);
        channels |= ch_arg;
        *argc -= 1;
    }

    if (channels == 0)
    {
        channels = DefaultChannels;
    }

    RB_GC_GUARD(arg);

    return channels;
}


/**
 * Raise TypeError when an non-ChannelType object is unexpectedly encountered.
 *
 * No Ruby usage (internal function)
 *
 * @param arg the argument
 */
void
raise_ChannelType_error(VALUE arg)
{
    rb_raise(rb_eTypeError, "argument must be a ChannelType value (%s given)"
             , rb_class2name(CLASS_OF(arg)));
}



/**
 * If Magick.trace_proc is not nil, build an argument list and call the proc.
 *
 * No Ruby usage (internal function)
 *
 * @param image the image
 * @param which which operation the proc is being called for
 */
static void call_trace_proc(Image *image, const char *which)
{
    VALUE trace;
    VALUE trace_args[4];

    if (rb_ivar_defined(Module_Magick, rm_ID_trace_proc) == Qtrue)
    {
        trace = rb_ivar_get(Module_Magick, rm_ID_trace_proc);
        if (!NIL_P(trace))
        {
            // Maybe the stack won't get extended until we need the space.
            char buffer[MaxTextExtent];
            int n;

            trace_args[0] = ID2SYM(rb_intern(which));

            build_inspect_string(image, buffer, sizeof(buffer));
            trace_args[1] = rb_str_new2(buffer);

            n = sprintf(buffer, "%p", (void *)image);
            buffer[n] = '\0';
            trace_args[2] = rb_str_new2(buffer+2);      // don't use leading 0x
            trace_args[3] = ID2SYM(THIS_FUNC());
            (void) rb_funcall2(trace, rm_ID_call, 4, (VALUE *)trace_args);
        }
    }

    RB_GC_GUARD(trace);
}


/**
 * Trace image creation
 *
 * No Ruby usage (internal function)
 *
 * @param image the image
 * @see call_trace_proc
 */
void rm_trace_creation(Image *image)
{
    call_trace_proc(image, "c");
}



/**
 * Destroy an image. Called from GC when all references to the image have gone
 * out of scope.
 *
 * No Ruby usage (internal function)
 *
 * Notes:
 *   - A NULL Image pointer indicates that the image has already been destroyed
 *     by Image#destroy!
 *
 * @param img the image
 */
void rm_image_destroy(void *img)
{
    Image *image = (Image *)img;

    if (img != NULL)
    {
        call_trace_proc(image, "d");
        (void) DestroyImage(image);
    }
}

#to_blobObject

#to_colorObject

#transparentObject

#transparent_chromaObject

#transposeObject

#transpose!Object

#transverseObject

#transverse!Object

#trimObject

#trim!Object

#undefineObject

#unique_colorsObject

#unsharp_maskObject

#unsharp_mask_channelObject

#view(x, y, width, height) ⇒ Object

Construct a view. If a block is present, yield and pass the view object, otherwise return the view object.


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# File 'lib/rmagick_internal.rb', line 1028

def view(x, y, width, height)
  view = View.new(self, x, y, width, height)

  if block_given?
    begin
      yield(view)
    ensure
      view.sync
    end
    return nil
  else
    return view
  end
end

#vignetteObject

#watermarkObject

#waveObject

#wet_floorObject

#white_thresholdObject

#writeObject