OpenMorphology   3901 magick/morphology.c     case OpenMorphology:    /* 2 primitive compound morphology */
OpenMorphology   4020 magick/morphology.c           case OpenMorphology:       /* erode then dialate */
OpenMorphology   1354 magick/option.c     { "Open", OpenMorphology, UndefinedOptionFlag, MagickFalse },