Re: Colorsync-users Digest, Vol 2, Issue 34
Re: Colorsync-users Digest, Vol 2, Issue 34
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 34
- From: Peter MacLeod <email@hidden>
- Date: Wed, 26 Jan 2005 10:48:27 -0800
From: Thomas Holm/Pixl <email@hidden>
Subject: Distiller, weird behaviour
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Guys,
I'm finding it hard to create a setting in Adobe Distiller where I can
tag different images with the correct profile when creating PDF's
through Distiller 6, by writing a postscript file and dumping this on
distiller or in a hotfolder.
Whether I select "tag everything" or"tag images only" the default
working space profile is embedded (regardless of the original profile
embedded in the image files) Tiff or EPS. I suspect this is because the
Postscript CSA/CRD isn't corrrectly read or something along those
lines.
I need to create PDF's which will retain the profiles though, and
preferably by writing postscript. Any way around loosing the profile
info?
Any takers?
The "Tag" settings tag uncalibrated objects, by definition. What you're
after is preserving the original source space through your workflow, not
tagging with a working space.
There are a few ways to do it, all depending on what's in your
PostScript. If your PostScript has correct CSAs, Distiller should be
able to parse them, but note that going from an ICC profile to a CSA and
back again is not lossless.
If your original profile exists on your system, there are comments you
can put in the PostScript CSA which distiller will parse in order to
subsitute the ICC profile back into the file. There's probably
documentation somewhere; the easiest way to figure it out is to print an
image to PostScript using PostScript CM using Acrobat or Photoshop, and
look at the comments embedded in the CSA. If you emulate those, it
should do what you want. The profiles have to exist in a "standard"
place on your system, standard enough that they will show up in
Distiller's profile menus. The profiles need to match on description,
colorspace, and copyright string. If they're CIEBasedABC profiles, the
profile and the CSA data are compared, and the match is rejected if they
are not approximately the same. The CIEBasedDEF and DEFG cases are more
lenient, because of some very bad DEF/DEFG CSAs produced by older
software--in that case the profile can match based on just description
string, colorspace, and copyright string. It uses descriptions and
copyright strings rather than absolute file paths in order to have a
better chance of working on different systems with the same profiles
installed.
The last way only works on the just-released Distiller 7: distiller 7
recognizes the ICC profile embedding mechanism described in the ICC
standard if "Process DSC Comments" is enabled. In that mechanism, you
embed the actual ICC profile in PostScript comments. See the ICC spec
for details.
--Peter
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