POV-Ray : Newsgroups : povray.beta-test : Gamma correction and anti-aliasing Server Time
29 Jul 2024 06:17:38 EDT (-0400)
  Gamma correction and anti-aliasing (Message 1 to 3 of 3)  
From: QZ
Subject: Gamma correction and anti-aliasing
Date: 8 May 2004 13:28:18
Message: <409d18b2$1@news.povray.org>
POV-Ray seems to apply gamma correction before anti-aliasing instead of
after. Is there any particular reason for this?

(I know it makes a small difference for most cases, but I was testing text
rendering, with the background being completely black and the text being
completely white. As you know, gamma correction doesn't affect 0 or 1; only
the values in-between.)

-- QZ


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From: Thorsten Froehlich
Subject: Re: Gamma correction and anti-aliasing
Date: 8 May 2004 13:55:51
Message: <409d1f27@news.povray.org>
In article <409d18b2$1@news.povray.org> , "QZ" <pik### [at] hotmailcom> 
wrote:

> POV-Ray seems to apply gamma correction before anti-aliasing instead of
> after. Is there any particular reason for this?
>
> (I know it makes a small difference for most cases, but I was testing text
> rendering, with the background being completely black and the text being
> completely white. As you know, gamma correction doesn't affect 0 or 1; only
> the values in-between.)

POV-Ray works as designed and has been discussed before.  This is not a bug.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: QZ
Subject: Re: Gamma correction and anti-aliasing
Date: 8 May 2004 14:51:41
Message: <409d2c3d@news.povray.org>
I forgot that the scene has a gamma too, but that's because I mostly deal
with assumed_gamma 1.

Anyway, what I meant to say was that the correction for display gamma should
take place after anti-aliasing, like this:
Correct for scene gamma -> Anti-alias -> Correct for display gamma

-- QZ


"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:409d1f27@news.povray.org...
> In article <409d18b2$1@news.povray.org> , "QZ" <pik### [at] hotmailcom>
> wrote:
>
> > POV-Ray seems to apply gamma correction before anti-aliasing instead of
> > after. Is there any particular reason for this?
> >
> > (I know it makes a small difference for most cases, but I was testing
text
> > rendering, with the background being completely black and the text being
> > completely white. As you know, gamma correction doesn't affect 0 or 1;
only
> > the values in-between.)
>
> POV-Ray works as designed and has been discussed before.  This is not a
bug.
>
>     Thorsten
>
> ____________________________________________________
> Thorsten Froehlich, Duisburg, Germany
> e-mail: tho### [at] trfde
>
> Visit POV-Ray on the web: http://mac.povray.org


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