As is mentioned in 
http://math1.uibk.ac.at/%28de%29/~werner/light/spectrum/

even 6 colors is inadequate.

Consider a vertical slit white light souce (we are neglecting
the wave nature of light, of course) which enters a prism.

What comes out isn't 3 slits of light, one red, one green,
and one blue, but a rectangular band of light encompassing 
the entire spectrum.

To properly model prisms, one must either use a large number
of color samples (whose rgb components sum to 1) or to apply
some sort of spatial broadening algorithm based on
d ior / d k_light to each of the r, g, and b beams.

Dan

K. Tyler cited:
> 
>   (c) Jeff Bowermaster
>       Splat! Graphics
>       5/23/92
>      I experimented with using 6 images instead of three, but the colors
>      started washing out.


-- 
http://www.flash.net/~djconnel/

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