MitchellFilter    100 Magick++/demo/zoom.cpp               filter=MitchellFilter;
MitchellFilter    297 Magick++/lib/Magick++/Include.h   using MagickCore::MitchellFilter;
MitchellFilter    973 magick/option.c     { "Mitchell", (ssize_t) MitchellFilter, MagickFalse },
MitchellFilter    712 magick/resize.c     { MitchellFilter,     BoxFilter      }, /* 'Ideal' Cubic-Keys filter    */
MitchellFilter   2581 magick/resize.c         filter_type=MitchellFilter;