>
> Perhaps I am wrong, but I can see 2 reasons why color rgb <0,0,1> looks
> darker than <1,0,1>:
>
>    -) <0,0,1> carries half the 'energy' of <1,0,1>. To be comparable in
> brightness, the 2 colors you mentionned should be of equal energy (use
> vnormalize)

How is that done, I've never heard of Vnormalize before.
I looked in the docs, but I don't see how to apply it to a color.

>    -) the human eye does not perceive the whole spectrum with the same
> intensity: with the same magnitude, a green color looks brighter than red
> and even brighter than blue.

I knew that.

> I think these reasons apply as well to plain colors for surfaces, to
> fade_color for interiors, and to scattering color for medias.

Probably so.

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