ingo wrote:
> 
> The film used here is a slide film, so it's a transfer function
> [scene->transparencey]. 
> 
> > If the transfer from film to paper/transparency is
> >not linear this would have to be modelled too.
> 
> It's not linear, the dynamic range of film is bigger than that of paper.

The maximum contrast ratio of 24bit crt display viewed in low ambient light
is about 170 and a 35mm slide has contrast ratio of over 500. Typical office
lighting reduces crt's contrast ratio down to 5 so it would be better to
model the paper process.

> Some curves of the tri-x b&w negative film

It's good to have someone around who knows about photography :)
This should be of interest to photographers:
http://www.naturalvisionsystems.com

I will now disappear down to my secret laboratory to ponder this new
information. There must have been previous research on this area
so now would be a good time to search for it also.


______________________________________________________________________
Kari Kivisalo                                  http://www.kivisalo.net

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