BlackmanFilter     90 Magick++/demo/zoom.cpp               filter=BlackmanFilter;
BlackmanFilter    577 Magick++/lib/Magick++/Include.h   using MagickCore::BlackmanFilter;
BlackmanFilter   1072 magick/option.c     { "Blackman", BlackmanFilter, UndefinedOptionFlag, MagickFalse },
BlackmanFilter    774 magick/resize.c     { SincFastFilter,      BlackmanFilter },  /* Blackman -- 2*cosine-sinc    */