If you read the background material by Hamrick re: VueScan, he states that it
is insufficient to just subtract the orange mask from each negative. The
problem is that the amount of the mask varies with the exposure so it
intereferes with applying an absolute amount of correction to each negative.
It is not as simple as just taking the white and black points and
interpolating the whole scene between these points. Rather some type of
curvilinear mask subtraction is needed for each type of film. This is why
VueScan lists so many different types of negatives in its database.
Or so I have been told
-because I know nothing.
Warren
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