OpenMorphology   3720 magick/morphology.c     case OpenMorphology:    /* 2 primitive compound morphology */
OpenMorphology   3799 magick/morphology.c           case OpenMorphology:       /* erode then dialate */
OpenMorphology   1300 magick/option.c     { "Open", (ssize_t) OpenMorphology, MagickFalse },