ConvertRGBToHWB   490 magick/colorspace.c               ConvertRGBToHWB(red,green,blue,&X,&Y,&Z);
ConvertRGBToHWB  3608 magick/enhance.c   ConvertRGBToHWB(*red,*green,*blue,&hue,&whiteness,&blackness);
ConvertRGBToHWB    69 magick/gem.h     ConvertRGBToHWB(const Quantum,const Quantum,const Quantum,double *,double *,
ConvertRGBToHWB   217 magick/methods.h #define ConvertRGBToHWB  PrependMagickMethod(ConvertRGBToHWB)