Re(4): embedded profiles in PDF/Postscript
Re(4): embedded profiles in PDF/Postscript
- Subject: Re(4): embedded profiles in PDF/Postscript
- From: Olaf Drümmer <email@hidden>
- Date: Fri, 4 Jun 2004 20:08:53 +0200
Dar Roger,
any PDF/X file - whether PDF/X-1a or PDF/X-3 (or even PDF/X-2) - must
have a (document wide) OutputIntent that describes for which printing
condition the PDF/X file has been prepared. If the PDF/X file only
contains CMYK or Gray (without ICC profiles), the OutputIntent may simply
point to a printing condition that is registered with the ICC registry,
but it may (in addition or instead) contain a CMYK printer profile to
describe the printing condition.
For PDF/X-3 (and for PDF/X-2) files that use device independent color
(ICC based colors, Lab or CalGra and CalRGB), an ICC printer profile in
the OutputIntent is mandatory.
As a PDF/X-1a file never must contain device independent color, the ICC
profile in the OutputIntent is optional as long as there is a valid
pointer to a printing condition in the ICC registry.
For practical purposes it typically makes sense to always embed a printer
profile in the OutputIntent, as a lot of tools and systems can pick it up
and do useful things with it, like a proof simulation (or a starting
point for a CMYK to CMYK conversion, if the file has to be printed in a
different printing process, e.g. offset instead of gravure).
Olaf Druemmer
email@hidden wrote Fri, 4 Jun 2004 12:56:25 -0400
>
> PDF/X-1a prohibits CMYK profiles in images. PDF/X-2 does allow ICC
>
> profiles for images (or any other object in a PDF page) though the main
>
> goal was to be able to have RGB profiles. CMYK profiles for objects on a
>
> page can be annoying as they typically trigger re-separation which very
>
> often is not desired.
>
>
>
> As a rule of thumb one can say: avoid CMYK profiles for objects in a PDF
>
> page (whether images or any other type of object) unless you have very
>
> specific reasons to have CMYK profiles.
>
>
>
> Olaf Druemmer
>
>
Dear Olaf,
>
>
You say PDF/X-1a prohibits individual CMYK profiles attached to individual
>
CMYK images. But it is not to say that the PDF does not contain a profile
>
that applies to the WHOLE document.
>
>
Roger Breton | Laval, Canada | email@hidden
>
http://pages.infinit.net/graxx
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