POV-Ray : Newsgroups : povray.beta-test : Same scene renders different in v3.7beta34 versus v3.62 : Re: Same scene renders different in v3.7beta34 versus v3.62 Server Time
5 Oct 2024 18:27:19 EDT (-0400)
  Re: Same scene renders different in v3.7beta34 versus v3.62  
From: Warp
Date: 3 Sep 2009 14:09:27
Message: <4aa00657@news.povray.org>
Fredrik Eriksson <fe79}--at--{yahoo}--dot--{com> wrote:
> When used as input, the pixel with the (gamma-corrected) value <0.73,  
> 0.73, 0.73> will be converted back to <0.5, 0.5, 0.5> *if you use a  
> gamma-aware image format*.

  If you are creating an image which will later be used to generate a
heightfield, why would you want the pixels to be gamma-corrected? That
will only destroy some of the information.

  For example, if you have a linear gradient 0, 1, 2, 3, ..., 255, and
then you gamma-correct them, write them to a file, then later read the
file and gamma-uncorrect them, the resulting values will not be the same
as originally. Some of the values will have been changed. There will be
some repeated values and gaps.

-- 
                                                          - Warp


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