Am 04.10.2012 04:51, schrieb Cousin Ricky:
> Hmmmm, does this mean that if one pushes the working color space to the limit
> (say, using 700, 520, and 380 nm on the outer edge of the chromaticity diagram),

Such a thing exists but with the primaries located at 700, 525, 450 nm 
and is called Adobe Wide-Gamut RGB. And it has the advantage that ICC 
profiles for it already exists - and making a *good* ICC profile (i.e. 
one that is not just a matrix shaper) for a home brew color space is a 
non-trivial task.

> and then converts back to sRGB, one can get an even richer image in sRGB?
>

I suspect so, yes - but this does greatly depend on the scene and in 
most cases sRGB works pretty well, it has been designed in the way it is 
for good reasons ;)
And you have absolute no visual control when you design your scene 
within a color space your monitor is unable to reproduce.

> One issue with a restricted gamut is objects with an almost-but-not-quite
> saturated pigment (which is essentially what you get in real life).  An object
> that is near-saturated green reflects a tiny bit of red and blue, and my
> practice has been to include this in the pigment.

Yes, but this can only by modeled with a spectral render engine. To 
express an out-of-gamut color you have to make one or two components 
negative but I guess this is not what you mean.

> (It would also lead to rather unconvincing metallic highlights,
> except that metals are never saturated enough to breach the sRGB gamut.)
>
Except i.e. for some gold-copper alloy, in a white room, lit by a 
fluorescent lamp ;)

-Ive

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