Kari Kivisalo wrote:

> 
> The patch simulates decrease of reactive chemicals in film
> emulsion during exposure. The areas that have received more
> light react less than other areas. Usefull for high contrast
> scenes as it brings up the dark areas and limit bright areas.

Heh, I made a patch just similar to yours a couple months ago... My first 
Povray modification :) You're using the 1-exp(-x) function, right?

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