PsiNegative      1021 magick/geometry.c               flags^=PsiNegative;  /* negate sign */
PsiNegative      1029 magick/geometry.c               if ((flags & PsiNegative) != 0)
PsiNegative      1095 magick/geometry.c     (flags & PsiValue) ? ((flags & PsiNegative) ? "-Y" : "+Y") : "  ",