POV-Ray : Newsgroups : povray.tools.general : a tonemapping question Server Time: 18 Jun 2019 07:31:28 GMT
  a tonemapping question (Message 1 to 2 of 2)  
From: Jan Dvorak
Subject: a tonemapping question
Date: 3 Dec 2007 08:12:31
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.


Post a reply to this message

From: Jan Dvorak
Subject: Re: a tonemapping question
Date: 4 Dec 2007 15:09:32
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


Post a reply to this message

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.