GrayscalePreview 872 Magick++/lib/Magick++/Include.h using MagickCore::GrayscalePreview; GrayscalePreview 2925 magick/effect.c case GrayscalePreview: GrayscalePreview 1499 magick/option.c { "Grayscale", GrayscalePreview, UndefinedOptionFlag, MagickFalse },