Gerhard Fuernkranz schrieb:
Mike Russell schrieb:
For input profiles, the ICC spec does not requre the presence of B2A tables, since it is not assumed that a scanner profile is ever used for PCS -> device transformations. But LUT-based display and output profiles should contain both, A2B and B2A tables. If they don't, then they actually do not comply with the ICC spec. Of course, if a display or output profile is onlyMarti wrote:
That is indeed a very difficult topic. For properly inverting a LUT you have to know the gamut boundaries, and then proceed differently inside or outside gamut. ..Thanks for your answer. This explains why some profiles have one direction, and then just include TRC's for the other direction.
... used for PCS -> device transformations, then the A2B tables won't be used.
(sorry, I must have accidentally deleted some text before sending the message).
-Gerhard
I fully agree with Marti, that this is not an easy task. But basically, any profiler must somehow solve this kind of problem. If you want to look at an example, see http://www.argyllcms.com/Is this a generally unsolved problem, or do proprietary solutions exist?
Regards, Gerhard
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