Gamut Mapping choices in ProfileMaker 5
Gamut Mapping choices in ProfileMaker 5
- Subject: Gamut Mapping choices in ProfileMaker 5
- From: Marco Ugolini <email@hidden>
- Date: Thu, 03 Mar 2005 21:09:19 -0800
On Mar 3, 2005, at 10:18 PM, Roger Breton wrote:
> My two cents here. As you know, these three Gamut Mapping choices only apply
> to Perceptual. As for the differences between each one, all I can say is
> that "Logo Classic" came in first, in v3, followed by "Chroma Plus" in v4
> and then followed by "Colorful" in v5.
>
> I tend to think that each new gamut mapping method allowed mapping out of
> gamut saturated colors closer and closer to the outer boundary of the device
> gamut, selectively or intelligently desaturating colors instead of globally
> desaturating colors by the same amount, as was used to be done in the past.
Hi, Roger.
How are you?
Do you mean to say that, as long as one uses Relative or Absolute
Colorimetric, or Saturation intents, and not Perceptual, the choice of Gamut
Mapping method is irrelevant, and has no effect on the results?
One thing puzzles me: I just read on the user list the other day a message
from Chris Murphy (dated March 2), saying that in the B2A transform "there
is gamut mapping and considerable gamut compression involved even in this
rendering intent [i.e., Relative Colorimetric]."
Following that observation, which seems to me to say that there are many
possible ways to map and compress in B2A1, then the choice of Gamut Mapping
method MAY affect the B2A transform yet in any of the rendering intents
(whereas the A2B portion works only one possible way in Rel Col,
apparently). The B2A transform, after all, is the one that creates the final
values that, say, are sent to a printer. So, perhaps, the choice of Gamut
Mapping method does have an effect on rendering intents other than
Perceptual.
I'm just trying to connect the dots here. Any thoughts?
A bientôt.
Marco Ugolini
Mill Valley, CA
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