Re: Remote proofing
Re: Remote proofing
- Subject: Re: Remote proofing
- From: bruce fraser <email@hidden>
- Date: Thu, 11 Mar 2004 12:45:09 -0800
At 9:17 PM +0100 3/11/04, Henrik Holmegaard wrote:
Leaving aside the strategic level and looking at the tactical level,
it is not only the case that the printing industry is opposed to
RGB. It is fair to say that the photographic industry is _also_
opposed to RGB.
Now why would that be?
It is desirable to not have CMYK but to RGB in order to achieve the
most clean and crisp transparency flattening in the flattening
module of a PostScript 3 interpreter.
Therefore, when Photoshop users send content to an InDesign user,
they may send their own choice of RGB Working Space tagged content.
They may not send their own choice of CMYK Working Space tagged
content but must agree to leave the conversion to a truly late
binding solution.
Therefore, only the Perceptual conversion is secure as the ICC has
not agreed on a 5th rendering intent for Relative Colorimetric with
Black Point Compensation.
This rekindles the objection users of Photoshop 1 to Photoshop 4
have always voiced, and still voice, over Perceptual rendering in
the ICC Specification.
No. The fundamental problem with late-binding workflows, and the
reason many quality-conscious image creators reject them, is that it
simply isn't rational to choose a rendering intent when the output is
unknown. Rendering intents are fundamentally just different ways of
handling the relationship between in-gamut and out-of-gamut colors.
It makes no sense to pick one when the output gamut remains unknown.
Current implementations know nothing of image content, just of the
spaces in which they reside, so if I work in ProPhoto RGB, perceptual
rendering will always desaturate the image, even if the image
contains no colors that are out of gamut for the current output
process. If late binding is to become viable for quality work, we're
going to need a great deal more intelligence in the CMM instead of
trying to handle everything in the profile. At minimum, we'll need
adaptive gamut-mapping that actually looks at the colors of the
image, rather than simply trying to shoehorn source space A into
destination space B.
--
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