Hi,
> while thinking about this thread, the following question came into my mind:
>
> What result would one actually expect from the gamut warning for
> _perceptual_ (or satuartion) intent?
> [...]
> My intuitive feeling sais, that I rather would not like to get this
> color marked, since it can be printed without clipping.
>[...]
Gamut checking is performed before the perceptual mapping.
A "perfect" perceptual or saturation intent, using perceptual mapping
on both sides may also have colors outside *destination* gamut.
For example, if you have a transform from euroscale to SWOP, the gamut
tag is being computed for SWOP using rel. colorimetric.
The perceptual AtoB0 for euroscale is the inverse of perceptual
euroscale output, so all input contone combinations falls inside
euroscale gamut, but not necesarely on SWOP gamut.
The pipeline is something like:
Input profile -> PCS -> Gamut check *for output* -> PCS -> output profile
. Perceptual Rel. colorimetric Perceptual
So, perceptual in input profile means all PCS values are in gamut
for input profile, but not necesarely for output.
Please also note that most of the habitual workspaces (sRGB, AdobeRGB,
etc) only implements rel. colorimetric, so a perceptual transform going
on, say, AdobeRGB to SWOP can make this effect even more evident.
Does it make sense to you?
Regards
Marti.
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