Re: Remote proofing
Re: Remote proofing
- Subject: Re: Remote proofing
- From: Henrik Holmegaard <email@hidden>
- Date: Sat, 13 Mar 2004 18:30:01 +0100
On lxrdag, mar 13, 2004, at 04:53 Europe/Copenhagen, Roger Breton wrote:
What you ask is nothing less than the ability to convert any placed
images
in InDesign to any output profiles! A many to many relation, in
database
parlance. < . . . > One output profile per document is plenty.
Right, so let's drive a six inch spike through this concept to make
sure it _really_ punctures -:).
As previously noted I doublechecked the concept of object level color
management for the Adobe side before starting this tread. And after
LogoProof, BatchMatcherPS and iQueue I don't think I have to check the
concept of object level color management on the GretagMacbeth side.
For a number of years I have seen the persistent call from U.S.
consultants for multiple destination spaces. The U.S. claim is that
this is a requirement for high quality object level color management.
The question then is if this _is_ a requirement for high quality object
level color management, or it is another U.S. misunderstanding.
In the PostScript Level 2 release 1 approach there is a support for
objects which are device color and objects which are CIEBased color,
that is, objects which reference a Color Space Array. Device colors are
rendered by the numbers and CIEBased colors are matched to the resident
CRD.
As designed there is only a concept of _one_ CRD because there is only
_one_ definition of the media state which the interpreter is targetting.
I asked Adobe cc the ECI if it might make sense to write into the EPS
Specification that embedding of CRDs is disallowed / illegal.
In principle it is possible for a PostScript programmer to embed a CRD
in an EPS and for say QuarkXPress to emit passthrough PostScript with
multiple CRDs in the page.
After chewing on the issue a bit the answer was that the text of the
EPS Specification will not be extended (1) because nobody has yet been
crazy enough to embed a CRD in an EPS and (2) short of manually
encapsulating PS coming out of InDesign there is no way an Adobe
application might be involved in embedding a CRD in an EPS.
Though the TechNote that introduces the OutputIntent changes the
position for PDF from using only the ToCIE direction in embedded ICC
profiles to using the full ToCIE and FromCIE model, there is still only
_one_ OutputIntent profile allowed.
Similarly, if iQueue embedded multiple (bidirectional) destination
profiles in a matched PDF this would be considered a bug and most
certainly not a feature.
When Chris has called for multiple destination spaces it has been in
the context of a bug with black replacement in ICC device profiles.
If for the same characterization table and the same ink limit setting
the print profiling software does not deliver the same color for
multiple black replacement settings, then this is technically a bug in
the print profiling software.
But from the fact that print profiling software may have a bug it does
_not_ follow that either the PostScript CMS or the ICC CMS should
implement a concept of multiple destination spaces for the same
printing condition.
EPS is a _lousy_ format because it mimics the quality criteria of the
repro camera operator. It is possible to embed a per image transfer
function in PostScript Level 1 release 1 because on the repro camera it
was possible to do a per image tonal adjustment. It is possible to
embed per object screeing because on the repro camera it was possible
to render screening on a per object basis. And the separation with
manual filters was likewise controlled on a per object basis in the
repro camera as it is in deviceColor EPS and EPS DCS. This is the pits
on the press, with every object rendering different from every other
object and no way to calibrate the ink zones.
In PDF/X-3 embedding of transfer functions and all this other non-sense
is called out and you get shoved into the slammer for doing it. Come on
folks, get real, there is no law that prohibits commonsense thinking
(even if it seems there might be at times -:)).
Thanks,
Henrik
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