in news:3DCE2184.862B3F26@luxlab.com Kari Kivisalo wrote:

> I have studied transfer curves of Kodak films and some of the
> slide films seem to match the simple exponential function.
> I think this has wider use than just for the really hard cases.

From a photographic point of view, have you ever looked into the "zone 
system" (Minor White, Ansel Adams)? It's a practical way of dynamic range 
control and an alternative for the scientific sensitometrics. The goal is 
to pre-visualise how a certain amount of gray will look in the final 
print. To control that there are two "variables" exposure and development 
(assuming a standardised film and printing method). For a low contrast 
scene you'll over-expose and under-develop, for high contrast scenes the 
opposite.

Ingo

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