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.

-- 
                                                          - Warp

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