Method: Magick::Image#remap

Defined in:
ext/RMagick/rmimage.cpp

#remap(remap_image, dither_method = Magick::RiemersmaDitherMethod) ⇒ Object Also known as: affinity

Reduce the number of colors in img to the colors used by remap_image. If a dither method is specified then the given colors are dithered over the image as necessary, otherwise the closest color (in RGB colorspace) is selected to replace that pixel in the image.

Returns self.

Parameters:

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

    The reference image or imagelist. If an imagelist, uses the current image.

  • dither_method (Magick::DitherMethod) (defaults to: Magick::RiemersmaDitherMethod) —

    this object

Returns:

  • self



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# File 'ext/RMagick/rmimage.cpp', line 11827

VALUE
Image_remap(int argc, VALUE *argv, VALUE self)
{
    Image *image, *remap_image;
    QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_frozen(self);

    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
            quantize_info.dither = MagickTrue;
#endif
            break;
        case 1:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }

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

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

    return self;
}