This was posted to the digikam mailing list recently:
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I've followed this instructions:
http://ninedegreesbelow.com/photography/well-behaved-camera-profile.html
but got strange results.
In short:
1)I've take a shoot of IT8.7/2 target
2)using DigiKam converted RAW to TIFF using 16bit color depth. All the
rest is disabled or set to default values.
3)using ArgyllCM i've created icc profile.
Then if I apply this icc for converting RAW images the results looks
like "losing contrast".
best regards,
Kostya.
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Hi Kostya,
AFAIK, the digiKam raw processor can't actually output a linear gamma
raw color image. Rather the raw color image that digiKam outputs already
has a roughly gamma=2.2 tone curve applied to it.
I made a note of this issue with digiKam at the bottom of section D4 in
this article:
http://ninedegreesbelow.com/photography/camera-profiles-applied.html#lut-profiles-vs-matrix-profilesI also mentioned the problem in this article:
http://ninedegreesbelow.com/photography/linux-raw-processor-review.html#radiometricI should put a similar note in the article you were following, so my
apologies! Anyway, try using the colprof parameter "-aG" or "-aS"
instead of "-am".
If you send me your ti3 file and your camera input profile, I can check
and see what actually happened.
Best regards,
Elle Stone
--
http://ninedegreesbelow.comColor management and free/libre photography
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