MagickSigmoidalContrastImageChannel 11659 wand/magick-image.c status=MagickSigmoidalContrastImageChannel(wand,DefaultChannels,sharpen, MagickSigmoidalContrastImageChannel 345 wand/magick-image.h MagickSigmoidalContrastImageChannel(MagickWand *,const ChannelType,