ThresholdBlackEvaluateOperator 547 Magick++/lib/Magick++/Include.h using MagickCore::ThresholdBlackEvaluateOperator; ThresholdBlackEvaluateOperator 1067 magick/option.c { "ThresholdBlack", ThresholdBlackEvaluateOperator, UndefinedOptionFlag, MagickFalse }, ThresholdBlackEvaluateOperator 389 magick/statistic.c case ThresholdBlackEvaluateOperator: