levelChannel      258 Magick++/demo/demo.cpp       example.levelChannel( RedChannel, 0.20*QuantumRange, 0.90*QuantumRange, 1.20 );
levelChannel     1080 Magick++/lib/Magick++/Image.h     void levelChannel(const ChannelType channel,const double black_point,
levelChannel      657 Magick++/lib/STL.cpp   image_.levelChannel( _channel, _black_point, _white_point, _mid_point );