Ron Parker wrote:
> >so -
> >
> >rgb<1,1,1> - rgb<1,0,0> = rgb <0,1,1> = opposite color ?
> 
> Exactly.
> 
> Cyan is the opposite of red.

The only problem being when the original colour is not full intensity, i.e.
something like rgb <.5,0,0>

rgb<1,1,1> - rgb<.5,0,0> = rgb<.5,1,1>

which is of course spectrally correct, but much brighter than the original.

I simply use my HSL macros (I've all but abandoned RGB)
This is what I do:

hsl(OriginalHue-0.5, S, L) = hsl(OppositeHue, S, L)

If the original hue is <0.5 add 0.5 instead of subtracting. The brightness of
the colour remains the same, which is especially important in media.

Margus

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