[filmscanners] RE: understanding contaminated blacks--SS4000--newbietype question

["Paul D. DeRocco" <pderocco@ix.netcom.com>]

If this is merely a variation in the black point for the three colors, it
should be possible to compensate for, more or less, by setting the black
point independently for the R, G and B channels in either Levels or Curves.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

> From: Anthony Atkielski
>
> I think that this is a result of the very limited headroom
> available in deep
> shadows on the film.  As the luminosity and exposure drop, the differences
> in sensitivity between different colors on the film become more and more
> obvious, and the color balance shifts dramatically.  What you are
> seeing is
> a tendency for the color to shift as exposure drops to zero.  Every film
> I've scanned shows this to some extent, and usually the color that stands
> out is green (i.e., the deep shadows are "contaminated" by green).
>
> It's very difficult to create a film with absolutely linear response to
> color for all possible exposures; the colors always shift a
> little depending
> on the exact amount of light a given spot receives.  For the extreme
> highlights and shadows, the shift gets pretty big.

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