GammaPreview      555 Magick++/lib/Magick++/Include.h   using MagickCore::GammaPreview;
GammaPreview     2375 magick/effect.c       case GammaPreview:
GammaPreview     1434 magick/option.c     { "Gamma", GammaPreview, UndefinedOptionFlag, MagickFalse },