clipka wrote:

> Well, if RGB components can be negative, then obviously we're not talking about
> a straightforward 3-band spectrum (or am I missing something here?) as
> simulated by POV-Ray.
> 

POV-Ray might want to use a straightforward 3-band spectrum (e.g. for 
dispersion calculation) but this is not how it works. It would be true 
if you define indeed *all* colors within your pigment statements as 
components from a 3-band spectrum but who does this?
POV simply works with what you feed in. I guess much more common are RGB 
values that are represented by the sRGB color space. But the RGB 
components from sRGB are not meant to be a 3-band spectrum (and I'm not 
talking about gamma here).
The same is true for the Wide-Gamut colorspace, Adobe RGB and what not...

Let me put it this way: what *color* is actually meant by rgb <1,0,0>
- and do not just tell me it's red - I know that ;)

Sorry, I'm really a bit in a hurry right now, but I will remember this
and we might discuss this later...

-Ive

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