GrayscalePreview  543 Magick++/lib/Magick++/Include.h   using MagickCore::GrayscalePreview;
GrayscalePreview 2345 magick/effect.c       case GrayscalePreview:
GrayscalePreview 1433 magick/option.c     { "Grayscale", GrayscalePreview, UndefinedOptionFlag, MagickFalse },