POV-Ray : Newsgroups : povray.general : assumed_gamma : Re: assumed_gamma Server Time
4 Aug 2024 10:16:03 EDT (-0400)
  Re: assumed_gamma  
From: Jim Charter
Date: 30 May 2003 16:37:19
Message: <3ed7c0ff$1@news.povray.org>
Slashdolt wrote:
> I still don't understand how I should use assumed_gamma.  I've read the
> documentation and it seems to conflict with itself.
> 
> "For PC systems, the most common display gamma is 2.2, while for scenes
> created on Macintosh systems should use a scene gamma of 1.8. Another gamma
> value that sometimes occurs in scenes is 1.0."
> 
> then later it says:
> 
> "For new scenes, you should use an assumed gamma value of 1.0 as this models
> how light appears in the real world more realistically."
> 
> So is there a preferred setting?  I've noticed that with assumed_gamma 1.0,
> I end up having textures with extremely low rgb values (< 0.1), just to get
> the texture dark enough.  I've also noticed that the T_Wood textures
> generally look really bad at assumed_gamma 1.0 under most lighting
> conditions.
> 
> I've been using higher values recently (around 2.0).  Does that mean that
> light is not modelled realistically?
> 
Set assumed_gamma to 1.0 in your code.  Then set the display_gamma in 
your master ini to a corresponding value, usually between 1.8 and 2.2 in 
order to get the look you want.  Then in theory, everyone else sees the 
same thing you do.  I use Display_Gamma=1.8 in my ini file


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