BlackThresholdImageChannel  123 magick/methods.h #define BlackThresholdImageChannel  PrependMagickMethod(BlackThresholdImageChannel)
BlackThresholdImageChannel  513 magick/threshold.c   status=BlackThresholdImageChannel(image,DefaultChannels,threshold,
BlackThresholdImageChannel   40 magick/threshold.h   BlackThresholdImageChannel(Image *,const ChannelType,const char *,
BlackThresholdImageChannel  875 wand/mogrify.c             (void) BlackThresholdImageChannel(*image,channel,argv[i+1],