Method: Magick::Image#level_colors
- Defined in:
- ext/RMagick/rmimage.cpp
#level_colors(black_color = "black", white_color = "white", invert = true, channel = Magick::AllChannels) ⇒ Magick::Image #level_colors(black_color = "black", white_color = "white", invert = true, *channels) ⇒ Magick::Image
When invert is true, black and white will be mapped to the black_color and white_color colors, compressing all other colors linearly. When invert is false, black and white will be mapped to the black_color and white_color colors, stretching all other colors linearly.
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# File 'ext/RMagick/rmimage.cpp', line 8630
VALUE
Image_level_colors(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickPixel black_color, white_color;
ChannelType channels;
MagickBooleanType invert = MagickTrue;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
rm_init_magickpixel(image, &white_color);
rm_init_magickpixel(image, &black_color);
switch (argc)
{
case 3:
invert = (MagickBooleanType)RTEST(argv[2]);
case 2:
Color_to_MagickPixel(image, &white_color, argv[1]);
Color_to_MagickPixel(image, &black_color, argv[0]);
break;
case 1:
rm_set_magickpixel(&white_color, "white");
Color_to_MagickPixel(image, &black_color, argv[0]);
break;
case 0:
rm_set_magickpixel(&white_color, "white");
rm_set_magickpixel(&black_color, "black");
break;
default:
raise_ChannelType_error(argv[argc-1]);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
GVL_STRUCT_TYPE(LevelImageColors) args = { new_image, &black_color, &white_color, invert, exception };
void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelImageColors), &args);
okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
GVL_STRUCT_TYPE(LevelColorsImageChannel) args = { new_image, channels, &black_color, &white_color, invert };
void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(LevelColorsImageChannel), &args);
okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
rb_raise(rb_eRuntimeError, "LevelImageColors failed for unknown reason.");
}
return rm_image_new(new_image);
}
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