Warp <war### [at] tagpovrayorg> wrote:
> Warp <war### [at] tagpovrayorg> wrote:
> >   As far as I can tell, there is no way in pov3.7 to replicate a pov3.6
> > color map (in terms of perceptual brightness) other than using the
> > 'assumed_gamma 2.2' backwards compatibility trick, which then affects
> > *all* colors, not just the color map.
>
>   I'm wondering if what pov3.7 is doing isn't actually backwards.
>
>   What it currently does is, basically, "by default 'rgb 0.5' means 50%
> absolute brightness; if you want 50% perceived brightness, use 'srgb 0.5'"
> (or whatever will be in the final).
>
>   Perhaps it should be the exact opposite: By default 'rgb 0.5' means 50%
> perceived brightness, and if you want 50% of absolute brightness, use ...
>
>   In other words, the "I want a gray shade that matches the black/white
> pattern that gives me 50% absolute brightness" should be the special case,
> not the default case. The default case should be "I want 50% perceived
> brightness".
>
>   Likewise with gradients: The default should be *perceived* linearity,
> the absolute linearity being the special case which has to be specified
> in a special way.

I sort of agree, but I think perhaps a more general solution would be even more
useful; allow the user to specify the colourspace in which the interpolation is
working. So you can specify a linear coourspace, or a sRGB colourspace, or a
specific gamma, or (actually quite usefully) HSV or L*ab or some other non-RGB
one.

>                                                           - Warp

Cheers,
Edouard.

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