Film Base Color Compensation

Hello all,

I got a question connected with the digital postpro-
cessing of color film scans.

Popular scanning software like VueScan offers what
is called "film base color correction", which, for
color films, is used to compensate for the inherent
non-white color of the transparent film.

Here I'd like to ask: What exactly does one need to
do to compensate for film base color? Is it enough
to shift the white point to transparent area of the
film or not? Or, maybe, it is some non-uniform color
transformation depending on brightness?

I am asking this because simply making a transparent
(not exposed) sections of the film grey (almost
white in fact, to get the shadows on the positive
almost black) does not seem to yield the right col-
ors on the whole scan...

Thanks in advance,
Anton

.

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