In article <3a0ed1ad@news.povray.org>, "Jan Walzer" <jan### [at] lzernet> 
wrote:

> Looking at the picture I think the effect comes from some
> clipping-effects of the different rgb-values or some
> non-continueities (you know what I mean) of the Gamma-function
> with negative values ...

I think the gamma correction uses a continuous, non periodic function, 
probably just a simple polynomial. The results you see are probably from 
the color values being clipped and otherwise messed up by the function.


> I think, the question is: When is it applied? Before or after AA??

Gamma correction would have to be applied to the final result of 
computing a pixel, correcting each sample wouldn't give the right 
result. Antialiasing has little effect on the image, it mostly makes a 
small difference in edges, so the change would be minor.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

Post a reply to this message