code: def RGB_to_CMY(cobj, *args, **kwargs):
      
      cmy_c = 1.0 - cobj.rgb_r
      cmy_m = 1.0 - cobj.rgb_g
      cmy_y = 1.0 - cobj.rgb_b
  
      return CMYColor(cmy_c, cmy_m, cmy_y)
docs: RGB to CMY conversion.
  
      NOTE: CMYK and CMY values range from 0.0 to 1.0