MagickThresholdImageChannel 5164 TclMagick/generic/TclMagick.c 	result = MagickThresholdImageChannel(wandPtr, chanTypes[chanIdx], threshold);
MagickThresholdImageChannel  306 wand/magick_wand.h   MagickThresholdImageChannel(MagickWand *,const ChannelType,const double),