I'm mega-busy right now and can't really stop to read up on this stuff again (a lot of it went over my head the first time, or didn't soak in).
But I think that Leif and I are working along broadly similar lines. I'm thinking of what I called an "input profile" as essentially the same thing as an output profile but in reverse. Consider, for example, a scanner that has a limited ability to read reds. The "input profile" that the scanner saves with its files describes the gamut that the scanner can deal with - i.e., the limitations of the device that made the image - so that subsequent devices can allow for those limitations and (hopefully) compensate for them.
I've bookmarked this thread and will come back to it, and some proper reading, when I get some free time.
(If I ever get some free time.)
(sigh)
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