GammaPreview      394 Magick++/lib/Magick++/Include.h   using MagickCore::GammaPreview;
GammaPreview     3006 magick/effect.c       case GammaPreview:
GammaPreview     1378 magick/option.c     { "Gamma", (ssize_t) GammaPreview, MagickFalse },