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Got nothing to do with gamut per se. One profile 'works better' because it's better producing the values the output device requires. It's possible neither profile is ideal too, one's closer to the actual output device behavior.
Thanks for the answer. If you happened to know a few good places to learn about color management please let me know. Thanks again!
Looking at the gamut volume graphics, I can offer an explanation, which might be academic:
The pink GRACol surface has a minimum at about a=0 and b=0.
The blue SWOP value has an excentric minimum and a higher Lmin value and the minimum looks
somewhat cut or cropped.
For Black Point Compensation (BPC) in Photoshop the minimum is found and the surface is replaced
by a paraboloid. For SWOP this represention is perhaps less reliable.
Of course the darkest black in SWOP is brighter than in GRACol. The maximal density in GRACoL
is larger. This shouldn't matter, if BPC could be applied correctly.
Best regards --Gernot Hoffmann
Thank you for your reply.
I will read up on the subject (I'm starting).