GrayscalePreview  397 Magick++/lib/Magick++/Include.h   using MagickCore::GrayscalePreview;
GrayscalePreview 3038 magick/effect.c       case GrayscalePreview:
GrayscalePreview 1379 magick/option.c     { "Grayscale", (ssize_t) GrayscalePreview, MagickFalse },