<Jer### [at] enstfr> wrote:

> 	I've been trying to implement something like that as a post_process
> effect, but I can't find an acceptable transfer function. Right now I
> have either an exponential whith no possiblity to change parameter and a
> very small compression range or a rational function whose parameters are
> changeable but whose compression range can't be small (and I haven't had
> time to test it yet anyway...). Any idea what function I could use?

A spline? I am working on a post_process filter which adjusts each 
channel with a spline, which should easily be able to do what you are 
talking about.

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

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