ThresholdPreview  386 Magick++/lib/Magick++/Include.h   using MagickLib::ThresholdPreview;
ThresholdPreview 1145 TclMagick/generic/TclMagick.c         BlurPreview,            ThresholdPreview,   EdgeDetectPreview, SpreadPreview,
ThresholdPreview  448 coders/preview.c       case ThresholdPreview:
ThresholdPreview 1050 magick/enum_strings.c     preview_type=ThresholdPreview;