ExtractAlphaChannel  287 Magick++/lib/Magick++/Include.h   using MagickCore::ExtractAlphaChannel;
ExtractAlphaChannel  873 magick/channel.c     case ExtractAlphaChannel:
ExtractAlphaChannel  104 magick/option.c     { "Extract", ExtractAlphaChannel, UndefinedOptionFlag, MagickFalse },