vlt.colorspace.rgb2cmyk

  RGB2CMYK - Convert RGB to CMYK

   CMYK = vlt.colorspace.rgb2cmyk(RGB)

   Converts from RGB color space to CMYK space.

   Color values must be in 0..1.

   See also:  vlt.colorspace.cmyk2rgb

   Derived from code posted to the web by
   Ch Begler at Scripps Institute of Oceanography