PixelIterateDualRead 546 magick/compare.c status=PixelIterateDualRead(call_back, PixelIterateDualRead 921 magick/compare.c (void) PixelIterateDualRead(ComputePixelError, PixelIterateDualRead 114 magick/pixel_iterator.h PixelIterateDualRead(PixelIteratorDualReadCallback call_back,