BlackmanFilter     90 Magick++/demo/zoom.cpp               filter=BlackmanFilter;
BlackmanFilter    292 Magick++/lib/Magick++/Include.h   using MagickCore::BlackmanFilter;
BlackmanFilter    957 magick/option.c     { "Blackman", (ssize_t) BlackmanFilter, MagickFalse },
BlackmanFilter    707 magick/resize.c     { SincFastFilter,     BlackmanFilter }, /* Blackman -- 2*cosine-sinc    */