RE: Perceptual intent [Gretag vs. Monaco?]
RE: Perceptual intent [Gretag vs. Monaco?]
- Subject: RE: Perceptual intent [Gretag vs. Monaco?]
- From: "LAMMENS,JOHAN (HP-Spain,ex2)" <email@hidden>
- Date: Tue, 29 Apr 2003 10:07:16 +0200
Not to pick nits, but all rendering intent tables have gamut mapping applied
to them, including the colorimetric ones. There are always large areas of
the PCS out of the printer gamut, and they need to be (gamut) mapped into
something printable. Colorimetric intents typically use minimum delta-E
mapping to the gamut surface, whereas Perceptual intents presumably use
something smarter and also move points inside the printer gamut, not just
the ones outside. Note that "min dE" mapping produces some rather strange
artifacts, and there is no rule that says that Colorimetric intents must use
it - they could also map to the gamut surface along lines of constant hue,
for instance.
Johan
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-----Original Message-----
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From: email@hidden
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[mailto:email@hidden] On Behalf Of neil snape
>
Sent: Monday, April 28, 2003 7:30 AM
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To: list; Graeme Gill
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Subject: Re: Gretag vs. Monaco?
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>
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on 28/04/2003 6:31, Graeme Gill wrote :
>
>
> Again, there is no technical restriction to perceptual intent. A
>
> perceptual profile is a colorimetric one with a gamut
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mapping applied
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> to it. The profiling part is what makes use of any
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adjustments to the
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> colorimetric values (illuminant, observer, paper whitener),
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and so is
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> there as a base on which other intents are built. Of course
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a profile
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> with a non-standard illuminant and/or observer is not strictly ICC,
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> and will only be meaningful when paired with a profile that uses a
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> similar illuminant/observer.
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Yes exactly.
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That's where Heidelberg got themselves into a philosophical
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reasoning about applying all the smarts into the perceptual
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side as it was decided that the destination space should be
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pleasing and other intents colorimetric. If this is the case
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Gretag should make it clear that the perceptual intent could
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be different than the others.
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>
Neil Snape email@hidden http://mapage.noos.fr/nsnape
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