SubtractQuantumOp  347 Magick++/lib/Magick++/Include.h   using MagickLib::SubtractQuantumOp;
SubtractQuantumOp 1109 magick/enum_strings.c     quantum_operator=SubtractQuantumOp;
SubtractQuantumOp 1189 magick/enum_strings.c     case SubtractQuantumOp:
SubtractQuantumOp 2142 magick/operator.c     case SubtractQuantumOp: