Rob Richards <ari### [at] btinternetcom> wrote:
> http://www.piritipany.com/spiralramp.jpg   3.6 version
> http://www.piritipany.com/spiralramp_v7.jpg   3.7beta version

First thing I notice is the significant difference in brightness. First thing
that comes to my mind is "gamma".

Comparing your images, it looks like your 3.6 image is gamma-corrected for a
typical PC display gamma (something like 2.2), while your 3.7 image has no
gamma correction applied.

3.7 sees a stronger separation between render engine and "frontend", and in this
context gamma correction has been revised to get it completely out of the
engine.

I think the current mechanism is still far from intuitive. Try setting
assumed_gamma to 2.2, and maybe add a "version 3.6;" statement; pay attention
to the warning messages output by POV-Ray regarding these settings (you don't
have to heed them, but they may give you hints).


The other issue I see in the 3.7 shot are dark bands on the background, but I
guess these are just reflections that are not as prominent in the 3.6 shot due
to the gamma correction stuff.

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