POV-Ray : Newsgroups : povray.binaries.tutorials : Check(er) Your Gamma : Re: Check(er) Your Gamma Server Time
20 Sep 2021 22:39:45 EDT (-0400)
  Re: Check(er) Your Gamma  
From: Edouard
Date: 5 Nov 2009 06:30:01
Message: <web.4af2b6982d58a2835b81d0ec0@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> You know your gamma settings are wrong if...
>
> ... you see a chrome sphere on a /checkered/ plane (even if you squint
> your eyes or look from a distance) in this image/scene.
>
> Ideally, the plane should appear in a featureless uniform grey (except
> for some moiree effects near the horizon and maybe in the reflection).
> If instead it appears to show squares of alternating shades of grey,
> something's bogus:
>
> (A) If you see checkering in the attached image file, then your image
> viewing software / operating system / graphics drivers / display
> hardware is poorly calibrated, and you should fix it before proceeding.
>
> (B) If (after fixing (A)) you see checkering in the preview window
> and/or the output file when rendering the scene file below, then your
> Display_Gamma (POV-Ray 3.6 and 3.7) and/or File_Gamma setting (POV-Ray
> 3.7 only), respectively, is wrong.

Well that produces a broken file for me if I choose to output a PNG file (i.e.
the gray value isn't half the white value). HDR output works though (as I assume
it's in linear space).

Cheers,
Edouard.


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