Re: CM through Quark
Re: CM through Quark
- Subject: Re: CM through Quark
- From: Chris Murphy <email@hidden>
- Date: Tue, 13 Jul 2004 15:47:21 -0600
On Jul 13, 2004, at 2:25 PM, Graeme Gill wrote:
Chris Murphy wrote:
Compensation; or perceptual which means you're at the whim of an
unknown, undefined flavor of rendering (at least until the whole ICC
v4 thing is more widely adopted and has proven itself).
And how does ICC V4 change this ?
The whole gamut mapping approach is just as fundamentally broken in
V4 as in previous versions, and no one has (nor probably should)
attempt
to standardize gamut mapping algorithms, and certainly haven't in V4.
I remain unconvinced that v4 is going to fix problems with perceptual
rendering, but supposedly they've now defined the PCS gamut so it's not
totally ambiguous like in v2. That gamut mapping itself is still
proprietary and undefined, until I see compelling results that indicate
otherwise, I expect v4 profiles will give proprietary one size fits all
conversions. However, I look forward to being convinced.
It seems to me that the underlying issue you refer to above is the
broken gamut mapping in ICC.
I guess from a bird's eye view it's not totally unfair to call it
broken, but really it's an architectural issue. If it were
fundamentally broken none of this stuff would work at all and clearly
it does work, just with limitations that become increasingly apparent
and problematic as time slips into the future. We can't have dynamic
gamut mapping in an architecture that demands pre-computation of gamut
mapping prior to knowing what the source space (let alone what's in the
image itself) and honoring those computations. The complete lack of
measurement data is also unfortunate.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6)
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