> The exposure time does not only affect the brightness of the picture, but
> also on the contrast. Contrast and brightness are not independent, they
> are controlled by exposure time and development time (with a given
> film/developer combination).

don't aperture settings play in to this as well?

> To take a picture of a high contrast subject, you have to overexpose, this
> pushes the average density towards the shoulder of the density curve, to
> compensate you have to develop for a shorter time.
> 
> >The scene would be rendered just once and stored
> >as floats and the photosim calculations would work on the float values.
> 
> one photosim for the monitor
> one photosim for the printer
> one for the slide-printer

this all sounds very interesting.  are you guys suggesting you'll take
this stuff up and try to make it work?   i, for one, would like to see
this happen.

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