Marti schrieb:
Using perceptual would map *all* colors inside gamut, so you should get no 5% at all...
Hi Marti,
ouf course you are right, and I should have expressed more clearly. Strictly speaking, this applies to all intents, i.e. the B2A tables for *all* intents (relcol, perceptual, saturation) eventually map *all* PCS colors inside gamut, or to the gamut boundary (for relcol, only OOG colors are remapped, and "clipped" to the gamut boundary, for other intents, even in-gamut colors may be remapped).
Nevertheless, for each intent (also perceptual and saturation), the set of PCS colors can be divided in two disjoint subsets, one subset of connected colors in the center of the PCS which can be mapped by the B2Ax table injectively from PCS to device space, and a second subset, which can be only mapped surjectively from PCS to device space. Even for perceptual intent, the 2nd subset can be non-empty, and gives IMO an estimate which set of PCS colors are clipped (and not smoothly compressed) by the perceptual mapping. With the "5%", I reather mean colors belonging to the 2nd subset.
I think, a softproof probably would give me a more intuitively helpful visual feedback, if it shows me which image colors belong to the 2nd subset for the selected rendering intent, than just showing me which colors are OOG in the PCS (before applying the perceptual mapping). For relative colorimetric intent, of course the OOG colors and the colors in the 2nd subset should be basically the same anyway.
Regards, Gerhard
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