Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: Graeme Gill <email@hidden>
- Date: Fri, 22 Feb 2008 14:33:54 +1100
Steve Upton wrote:
Here's a question I have... (not directed at Klaus)
What does rendering intent have to do with device gamut?
The intent that is, well, intended by the user has NOTHING to do with either the colors
in the original image OR the gamut of the output device.
No, but once an image is represented as device values, the
conversion back from RGB to CIE values is not unambiguous.
Using the usual mechanism of an ICC profile and a typical CMM,
there are several ways of doing this, depending on the users
purpose. It would be a rather unusual image in fact that
had a mechanism available to convert it back to the original
scene color values, since usually images have gone through
a lot of manipulation to make them "look right".
And then there is the ambiguity with regard to what you mean by
"output gamut". One interpretation is that it is the range
of CIE colors that the device can actually produce.
Another interpretation might be that it is the range of CIE colors
that can be fed into it's B2A tables and not clip. Given the
presence of gamut compression in the B2A tables, these may be
quite different gamuts.
Graeme Gill.
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