I have now checked the vignetting data with some real images and they do a good job. Whilst sRGB is indeed the color space set in the camera and does appear in the metadata of the raw file I don't think that it can be relevant to the raw data. I see from the dcraw man page that olympus raw files have an embedded color matrix that the -M switch (used in calibrate.py) ignores.
*+M* or *-M*Use (or don't use) any color matrix from the camera metadata. The default is *+M* if *-w* is set or the photo is in DNG format, *-M* otherwise. Besides DNG, this option only affects Olympus, Leaf, and Phase One cameras. Maybe darktable/rawspeed uses the the embedded matrix. This could perhaps explain why there is very little difference between use of rec2020 and enhanced color matrix as input profiles. Anyway I am happier now, but maybe this is just a problem/solution with .ORF files. regards, Jim >> >> >>
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