GammaAdjustQuantum  721 magick/operator.c #  define GammaAdjustQuantum(quantum) (MaxRGBDouble*pow(quantum/MaxRGBDouble,1.0/immutable_context->double_value)+0.5)
GammaAdjustQuantum  723 magick/operator.c #  define GammaAdjustQuantum(quantum) (mutable_context->channel_lut[ScaleQuantumToMap(quantum)])