MitchellFilter    100 Magick++/demo/zoom.cpp               filter=MitchellFilter;
MitchellFilter    585 Magick++/lib/Magick++/Include.h   using MagickCore::MitchellFilter;
MitchellFilter   1103 magick/option.c     { "Mitchell", MitchellFilter, UndefinedOptionFlag, MagickFalse },
MitchellFilter    779 magick/resize.c     { MitchellFilter,      BoxFilter      },  /* 'Ideal' Cubic-Keys filter    */
MitchellFilter   2965 magick/resize.c         filter_type=MitchellFilter;