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AFAICT using the -4 flag

AFAICT using the -4 flag means gamma coefficients both set to 1. So I *think* that means that gamma correction should make no changes. Is that correct?

Certainly -d and -D give quite different results - d is quite a bit brighter than the -D version - would that fit with black subtraction processing? Where in the code would I find the black subtraction (so I can do that processing myself on the RAW data?

Is it out of order to ask why the document mode code was removed?

Thanks again

David Partridge