Rune wrote:
> 
> Could you refresh my memory in what exact order things are handled now?
> First antialiasing, then gamma-correction, then color clipping? Where does
> the non-linear tone mapping fit in? Is it the same as gamma correction?

The term 'tone mapping' is used for the combination of all operations 
used to map the light intensities returned by the raytracer to the color 
values of the images.  In the simplest case this is no operation at all 
but in most cases you will use at least clipping and gamma correction. 
More sophisticated techniques exist which usually make the clipping 
completely unnecessary because the mapping function maps the infinite 
range of possible intensities to a finite interval.

POV-Ray 3.6.1 does antialiasing with the unmodified intensity values, 
clips them, gamma corrects them and then writes them to the file.  In 
MegaPOV (1.0 and later) the film exposure is (when enabled) applied 
before the clipping and in fact makes it unnecessary (it is still there 
but has no effect).

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 06 Jul. 2004 _____./\/^>_*_<^\/\.______

Post a reply to this message