levelChannel      258 Magick++/demo/demo.cpp       example.levelChannel( RedChannel, 0.20*MaxRGB, 0.90*MaxRGB, 1.20 );
levelChannel      398 Magick++/lib/Magick++/Image.h     void            levelChannel ( const ChannelType channel,
levelChannel      606 Magick++/lib/STL.cpp   image_.levelChannel( _channel, _black_point, _white_point, _mid_point );