ValidateScalingIndex  222 coders/pnm.c       ValidateScalingIndex(image, pixel.red, max); \
ValidateScalingIndex  223 coders/pnm.c       ValidateScalingIndex(image, pixel.green, max); \
ValidateScalingIndex  224 coders/pnm.c       ValidateScalingIndex(image, pixel.blue, max); \
ValidateScalingIndex  450 coders/pnm.c                       ValidateScalingIndex(image, intensity, max_value);