ThresholdEvaluateOperator  543 Magick++/lib/Magick++/Include.h   using MagickCore::ThresholdEvaluateOperator;
ThresholdEvaluateOperator 1054 magick/option.c     { "Threshold", ThresholdEvaluateOperator, UndefinedOptionFlag, MagickFalse },
ThresholdEvaluateOperator  383 magick/statistic.c     case ThresholdEvaluateOperator: