POV-Ray : Newsgroups : povray.general : Re: PNG output much brighter than preview... : Re: PNG output much brighter than preview... Server Time
31 Jul 2024 22:17:24 EDT (-0400)
  Re: PNG output much brighter than preview...  
From: "Jérôme M. Berger"
Date: 21 Jan 2007 14:44:09
Message: <45b3c289@news.povray.org>
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Nicolas George wrote:

>> 	It's already in the standards: the HTML specifications states that
>> color should be given in the sRGB color space.
> 
> Note that sRGB does not use linear values, but a gamma of 2.2.

	"linear" doesn't mean anything. You should be more precise: "linear
with relation to xxx", where xxx could be one of:
 - Radiant intensity;
 - Luminous intensity;
 - Human perception.

	When you say that there is a gamma of 2.2, that is between sRGB and
luminous intensity, but that is absurd as a light measure: radiant
intensity makes sense as a pure physical value, luminous intensity
is computed from radiant intensity by taking into account some
characteristics of human perception but not all!

	sRGB is actually pretty close to being linear with relation to
human perception, which makes the most sense for use by people who
are not color specialists...

		Jerome
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