POV-Ray : Newsgroups : povray.advanced-users : Converting pre-gamma scenes to assumed_gamma = 1? : Re: Converting pre-gamma scenes to assumed_gamma = 1? Server Time
19 May 2024 16:14:51 EDT (-0400)
  Re: Converting pre-gamma scenes to assumed_gamma = 1?  
From: Alain
Date: 21 Aug 2010 14:43:02
Message: <4c701e36@news.povray.org>
Le 2010-08-20 19:02, SharkD a écrit :
> On 8/17/2010 7:59 PM, Alain wrote:
>> And there are also cases where assumed_gamma was (ab)used instead of
>> ajusting the lights intencity or the finish. Like: My scene is to
>> dark/bright, don't bother looking at the lights/finishes/pigments,
>> change assumed_gamma to compensate.
>>
>> Often, you'll need to adjust the falues of the light_source as well as
>> the pigments and textures.
>>
>>
>> Alain
>
> I've been doing some systematic tests and tweaks. So far I can reproduce
> the appearance of pre-assumed_gamma scenes in scenes with assumed_gamma
> = 1 in cases where the following parameters vary:
>
> 1. lighting color
> 2. pigment color
> 3. ambient (finish, not global_settings)
> 4. diffuse
>
>
> I haven't figured out filter and transmit yet. I'm guessing it will
> require replacing the linear pigment/gradient functions in the original
> scenes with exponential ones.
>
>

You probably don't need to change the filter and transmit values.


Alain


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