I wrote:
> (snip)
>Scanner drivers "know" this fact and remove the masking fairly correctly.
> Removing the mask via an image editor will only be filtering out a uniform
> colour bias over the whole image, and can be the cause of "crossed curves"
> (shadows one colour, highlights another colour). If you need to prove
this,
> scan a colour negative normally, then scan it again as a transparency,
> invert its tones then rebalance the colours. The results will be
distinctly
> different, a little like prints from cross-processed Ektachromes but not
as
> contrasty.
>
Sleep deprivation must have blurred my logic. I meant to say that scanning
colour negs as slides and correcting in the image editor would cause colour
reproduction errors in the vein of a cross processed ektachrome, but I
should not have said that it would resemble the cross-processing effect.
This scanning method would yield an image retaining the effects of the
orange mask designed to correct faults in wet-process printing, but not
needed for monitor display or a digital print. OTOH, cross-processing of
slide films gives a negative that lacks a correcting mask for wet-process
printing, as well as being grossly tonally distorted by the large film speed
change that goes with the technique.
So, the result of scanning negs as slides and then correcting is a moderate
distortion of tonal values while the result of cross-processing is a radical
and bizarre distortion of tones.
Hope this corrects any misconception I may have caused.
Regards,
Anthony Farr
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