Re: Re(6): embedded profiles in PDF/Postscript
Re: Re(6): embedded profiles in PDF/Postscript
- Subject: Re: Re(6): embedded profiles in PDF/Postscript
- From: Chris Murphy <email@hidden>
- Date: Thu, 24 Jun 2004 11:19:15 -0600
On Jun 24, 2004, at 9:17 AM, Doug Walker wrote:
On Sunday, June 6, 2004, at 04:08 PM, Chris Murphy wrote:
ICC profiles do not exist in a PostScript stream. They get converted
to PostScript CSA's. So to do this, you'd be asking for a less than
high quality conversion asking the PostScript interpreter to convert
from CSA tagged RGB to a CRD destination; and then once it's
normalized to PDF to get tagged properly with the originally ICC
version (from which the CRD was created). I don't think this is a
particular useful workflow myself, and I think Adobe probably
disregarded it as well because it makes very device dependent PDFs
which Adobe tries to avoid unless it's one of the PDF/X-s.
If you want something like this, the solution is to tag everything or
tag only images. Any CSA's get converted to ICC profiles and tag
those objects. At print time, you select the destination profile and
at that time content is converted to CMYK. InDesign's PDF export will
also do what you are asking, and it's easier there just because there
is no distillation process. Everything stays PDF, in an ID PDF
export, there is no PostScript.
Chris,
Is the statement above ONLY referring to RGB files and NOT CMYK files
or both?
Which part?
If a Quark 6.0 document containing CMYK images tagged w/ the profile
(US WEB Coated SWOP v2) gets exported to Postscript, and you say ICC
profiles do not exist in a PostScript stream......I am wondering if I
send tagged CMYK TIF files to Quark 6.x documents if I need to be
concerned.
It depends on whether you wanted the profile preserved downstream or
not. A CMYK image with embedded profile will have only its numbers sent
through to the output device from QuarkXPress. The profile doesn't go
with it. And actually it's the same with InDesign for that matter. The
difference is that InDesign has the option of a.) exporting PDF and
preserving per object ICC profiles, or b.) creating a PostScript stream
containing per object CSA profiles based on each object's embedded ICC
profile. But PostScript color management is not a default behavior in
InDesign (it is in Acrobat, which I think is absurd, but that's another
story).
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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