In article <39080881.2064B6D2@inapg.inra.fr>, Gilles Tran 
<tra### [at] inapginrafr> wrote:

> In addition to all the post-process requests that have been made in the
> past few days, there is one that is particularly important to me, which
> is the ability to manipulate separately the highlights/midtone/shadows
> proportions (?) of the image. (if this was already mentioned under
> another name in one of Glen Berry's message, forget about it).
> Many (not all) povray images "out of the render" share a common
> characteristic that makes them instantly recognizable, which is to be
> too evenly lit : they're too dark, or too bright, and generally lack
> contrast and saturation. There are ways in povray to avoid this, but I
> find it very difficult to obtain when the scenes involve many light
> sources and in fact I'm not sure it can be done for every picture. One
> simple post-process trick is to tinker with the highlight/midtone/shadow
> proportions, generally by increasing both the hightlights and the
> shadows. The price to pay is a loss of detail in both ranges, so this
> must be used wisely, but many pictures greatly benefit from this and
> appear much more "lively", as if a thin layer of dust had been removed.
> I'll post before/after examples in pov.binaries if someone is
> interested.

If you can give me some of the math behind this, I could try to make a 
filter for it. You can already shift the color balance around some using 
the exponent, add, and multiply filters which I added.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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