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.
> 
> I have combined aperture, film speed, and exposure time into
> one exposure variable which goes into global_settings. The images
> show the difference between normal and exposed image. I'll test
> it some more to see if it works nicely with anti-aliasing and
> focal blur.

I call it contrast masking, or dynamic range compression.
I used that method during development of black and white photos for an 
exhibition I held about 15 years ago. 
I used it for both the film and the paper with the film being a very high 
resolution copy film with an ASA of about 12, a very high silver content 
and almost invisible grain, even when 35mm frames were printed at 16X20 
inches.

The subject matter was shot in full sunlight and included white marble and 
black granite so you can imagine how massive the dynamic range was!

You place the developer saturated emulsion into a warm water bath (very 
gently!) and then it continues to develop, but with the shadows held back 
as they consume more of the locally available developer.

I think your patch will be very useful in some scenes.

-- 
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problem

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