ExtractAlphaChannel  241 Magick++/lib/Magick++/Include.h   using MagickCore::ExtractAlphaChannel;
ExtractAlphaChannel  744 magick/channel.c     case ExtractAlphaChannel:
ExtractAlphaChannel  100 magick/option.c     { "Extract", ExtractAlphaChannel, UndefinedOptionFlag, MagickFalse },