Jack, you bring up a topic which I also wanted to discuss with Marti eventually.
Basically I think, the artifacts we can see are amplified noise from the scanner.
However it is still unclear for me, why applying some profiles boost the noise *so* strongly.
I see this phenomenon with scanner profiles I've created myself, and I also see it with profiles I've created with LCMS lprof. Maybe profiles from other profilers also suffer from this problem, but I can't assess that. Appearently the noise amplification increases, when the "quality" of the profile increases. For simple matrix/shaper profiles the strength of the effect is pretty low, but it becomes stronger and stronger if I use more and more polynomial terms to match the data points (which actually lowers the dE error of the profile and increases the precision).
Marti,
do you have any idea what excatly causes this problem and how profiles could be improved to prevent this effect, without loosing the accuracy of the profile?
Regards, Gerhard
Jacek Zagaja schrieb:
Dear group,
What is the reason of green artifacts using Gamma 1/2,2 LCMS profiles. That effect appears in both Photoshop and TIFICC converters. I uses levels to show this effect:
http://tme.szczecin.pl/~jacek/temp/LCMS/LCMS.jpg
and right TRC profile:
http://tme.szczecin.pl/~jacek/temp/LCMS/xlp.jpg
Please advice me because this problem is very common.
Jack,
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