rgb-icc()The rgb-icc() colour function provides additional ways to specify colours, including:
rgb-icc(#CMYK, 0.5, 0.5, 0.5, 0) : CMYK colour.
rgb-icc(#Grayscale, 0.5) : Grayscale
rgb-icc(#Separation, 'Name') : Spot colour.
rgb-icc(#Registration) : Print with the same intensity on all separations.
rgb-icc(#Separation, 'All') : Same as rgb-icc(#Registration).