POV-Ray: Newsgroups: povray.tools.general: a tonemapping question

POV-Ray : Newsgroups : povray.tools.general : a tonemapping question		Server Time 22 Dec 2024 01:05:35 EST (-0500)

From: Jan Dvorak
Subject: a tonemapping question
Date: 3 Dec 2007 03:12:31
Message: <4753ba6f@news.povray.org>

Hello,
currently the tonemapping (megapov) affects each RGB channel 
independently. Is it possible to make it affect the luminace but not the 
overall color (hue, saturation)?

The color is perceived in the eye in a Lab format, luminace being 
treated logarithmically. I want to simulate this behavior to compress 
HDR images into LDR inside pov-ray.

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From: Jan Dvorak
Subject: Re: a tonemapping question
Date: 4 Dec 2007 10:09:32
Message: <47556dac$1@news.povray.org>

Jan Dvorak napsal(a):
> Hello,
> currently the tonemapping (megapov) affects each RGB channel 
> independently. Is it possible to make it affect the luminace but not the 
> overall color (hue, saturation)?
> 
> The color is perceived in the eye in a Lab format, luminace being 
> treated logarithmically. I want to simulate this behavior to compress 
> HDR images into LDR inside pov-ray.
oops, wrong group

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