[cairo] Spot colors (and CMYK)

[ecir hana]

On Sun, Feb 21, 2010 at 3:36 AM, Chris Murphy <lists at colorremedies.com> wrote:
>
> Many spot colors have no CMYK equivalent that ensures reversibility back into its original XYZ/LAB value.

Sorry, I don't understand again. A profile is just a mapping between
two spaces, be it LUT or some function, right? So why can't I create a
profile which would say CMYK(a, b, c, d) = LAB(x, y, z)? I know it
would probably be very different than say SWOP but pure theoretically,
ICC should allow this, no?