Re: Remote proofing
Re: Remote proofing
- Subject: Re: Remote proofing
- From: Henrik Holmegaard <email@hidden>
- Date: Thu, 18 Mar 2004 13:22:31 +0100
If the invertible ICC rendering model is not supported in PostScript,
and not in the basic PDF architecture, how is an RGB workflow with
remote proofing possible?
Adobe Technical Note 5413 introduced the OutputIntent construct in
January 2001. The Technical Note is available at www.adobe.com.
The previous attempt to marry the invertible ICC model with the
non-invertible PostScript model was based on EPS, so why did that
flounder?
The ICC Specification defines how ICC profiles may be embedded as
PostScript comments in Encapsulated PostScript.
It would appear that those who originally compiled the ICC
Specification had an analogy with the showpage operator in mind.
That is, the application software in which an Encapsulated PostScript
file is placed is responsible for taking certain steps.
(1) The sum of scaling, skewing and rotating actions applied to the
bounding box in the context of the X and Y page geometry is passed to
the interpreter.
(2) The showpage operator, while is allowed in EPS, must be stripped
out in order that only one showpage per page is passed to the
interpreter.
(3) Comments in the form of ICC profiles could be considered in two
ways,
(3a) they were to be applied before PostScript was streamed, or
(3b) they were to be applied after PostScript was streamed.
Item (3a) would be useful for upstream page design software and item
(3b) would be useful for OPI and other downstream software.
There is nothing ambiguous about items (1) and (2). It is clear that
the user wants geometries applied and wants embedded showpage operators
stripped.
There is an ambiguity about item (3) because it is not clear if the
user wants to apply conversions in the authoring software or in the
repurposing software.
The ambiguity was not addressed through the addition of user interface
controls which has allowed the ambiguity to remain unresolved for a
decade.
Thanks,
Henrik
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