BlackThresholdImage 8386 magick/command.c             (void) BlackThresholdImage(*image,argv[i]);
BlackThresholdImage   54 magick/effect.h   BlackThresholdImage(Image *image,const char *thresholds),
BlackThresholdImage  702 wand/magick_wand.c   status=BlackThresholdImage(wand->image,thresholds);