colour correction with macbeth


I am using macbethcal to correct some images for use in radiance. I am
scanning color negatives with Linocolor, which does the colour inversion for me.

Some of my scans give good results by simply applying the
macbethcal-correction to them. Others are too bad to produce a good .cal-file. E.g. some have
evidently too much blue. I found that doing a "auto correction" in photoshop
before using macbethcal gives better results. But is this ok (I do the color
correction on the area of the picture containing the colour checker as well as
on the material / texture I want to get, of course)? Or is it "forbidden" to
do anything besides the pcomb-correction?

Thank you, CU, Lars.


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