Hi,

I have some digital photos of faded old colour prints. The R, G, B 
histograms are squashed and shifted with respect to eachother due to the 
different fading characteristics of the different pigments in the paper.

It seems to me the best way to fix what I am seeing would be if I could 
apply the exposure or levels module to the R, G, B modules 
independently.

What's the closest feature in darktable to achieve such a thing?

I can kind of do it dragging the histogram but that is extremely slow 
and jerky, and I can't find which module actually implements that 
processing, nor documentation of it, so am hesitant to use it.

I can partly do what I need by playing with channel mixer or color 
correction, but it is not flexible enough to really do what I need to 
do, which to first order is move the left end of the red histogram to 
the left and the right end of the red histogram to the right.

Thanks in advance for any help you can offer.

Russell


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