MagickGetImageChannelMean 2462 TclMagick/generic/TclMagick.c 	result = MagickGetImageChannelMean(wandPtr, chanTypes[chanIdx], &mean, &deviation);
MagickGetImageChannelMean  190 wand/magick_wand.h   MagickGetImageChannelMean(MagickWand *,const ChannelType,double *,double *),