FYI. Discussion of something I've never heard of... reciprocity failure
localized to individual color layers within film.
Chuck Norcutt
> ... scanning negs is a tricky process! I'm guessing your problem is
> color curve crossover. That is (if I understand the term), you have
> different color casts at different density levels; for example,
neutrals
> are too blue in the shadows and too yellow in the highlights. I
believe
> this happens mostly with negs that are nearly over- or underexposed,
where
> their individual color layers' sensitivities do not track so closely
> (essentially a localized form of reciprocity failure). It can also
happen
> when an autoexposure or autolevels operation forces the lowest and
highest
> values for each color channel to zero and full saturation,
respectively,
> even though that might be inappropriate for a specific image's
content. A
> single-point or blanket color tweak will not fix this. You will
probably
> have to judiciously nudge multiple points on each color channel curve
to
> fix this. Try using shadow, midrange, and highlight eyedroppers in
Levels
> (or its scan software equivalent) as a starting point, carefully
selecting
> neutrals for each sample.
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