>
> Self-masking occurs in a printing-out process. As the shadows darken they
> cut down on the light getting through to the emulsion. Whether the light
> sensitive materials are on the paper or in a layer of gelatine is
> ancillary or immaterial.
>
> Judy
>
One could also add that it has the effect of taking the process away from a
straight line response rather than contributing to it!
Peter Marshall
On Fixing Shadows, Dragonfire and elsewhere:
http://faraday.clas.virginia.edu/~ds8s/
Family Pictures & Gay Pride: http://www.dragonfire.net/~gallery/
and: http://www.speltlib.demon.co.uk/