ConvertLabToXYZ  1510 magick/colorspace.c   ConvertLabToXYZ(100.0*L,255.0*(a-0.5),255.0*(b-0.5),&X,&Y,&Z);
ConvertLabToXYZ   757 magick/gem.c     ConvertLabToXYZ(luma,chroma*cos(hue*MagickPI/180.0),chroma*
ConvertLabToXYZ   203 tests/validate.c   ConvertLabToXYZ(L*100.0,255.0*(a-0.5),255.0*(b-0.5),&X,&Y,&Z);