UndefinedPreview  851 Magick++/lib/Magick++/Include.h   using MagickCore::UndefinedPreview;
UndefinedPreview 1475 magick/option.c     { "Undefined", UndefinedPreview, UndefinedOptionFlag, MagickTrue },
UndefinedPreview 1505 magick/option.c     { (char *) NULL, UndefinedPreview, UndefinedOptionFlag, MagickFalse }
UndefinedPreview 2423 wand/mogrify.c               preview_type=UndefinedPreview;
UndefinedPreview 7287 wand/mogrify.c                 image_info->preview_type=UndefinedPreview;