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Re: Distiller 5 CSA to ICC matrix
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Re: Distiller 5 CSA to ICC matrix


  • Subject: Re: Distiller 5 CSA to ICC matrix
  • From: olaf druemmer <email@hidden>
  • Date: Sun, 6 May 2001 22:37:08 +0200

Hi,

what happens when
- a Photoshop EPS
- with PostScript color management turned on
- is distilled by Distiller
- at least when leave colors unchanged is turned on
is:
- PostScript color management is achieved through a CSA
- Photoshop 6 (I haven't checked other versions or apps) writes extra
info into the CSA, namely stuff like profile name, rendering intent,
creator of profile etc.
- Distiller 5 picks up that info and
- tries to find a profile on the workstation (in the various places where
ICC profiles live) that matches the extra information in the CSA
- if a precise match is found the matching profile is embedded into the
PDF and the resp. color values are left untouched
- thus we arrive at ICC based color space (something, which is very
useful from my point of view) with color values untouched.
- this works for gray scale, RGB and CMYK.

The only thing that is annoying is that we have to figure this out by
experimentation (in such an area I consider experimentation and
professionalism mutually exclusive...). I got some confirmation from
Adobe about this behavior but would rather prefer to have a precise
description of what is happening when.

Olaf Druemmer


> --- Henrik Holmegaard wrote 5/6/01 4:49 PM: ---

>Mauro Boscarol wrote:
>
>>Do you mean a Photoshop 6 EPS file distilled by Distiller 5?
>
>Also if you select PostScript Color Management and an ICC printer
>profile and rendering intent say in Illustrator 9.
>
>The AtoB1 intent (maybe AtoB0 also, I'm not sure yet) in the ICC
>printer profile is converted into a CIEBasedDEFG CSA.
>
>The PDF 1.3 specification doesn't implemented calCMYK / CIEBasedDEFG.
>So Distiller 4 can't just leave the object as it is and bring both
>object and color space specification into the PDF file. It has to
>convert the object, so it converts the object into Lab, creating the
>first half of a proofing transform.
>
>Distiller 5 leaves the CMYK object alone and instead converts the
>color space specification from CIEBasedDEFG to ICC. This way you have
>a way ahead with the document.
>
>>i.e., ih the case "TagICC UntagPSCM" ICC is ignored?
>
>Yes, because PostScript doesn't support ICC profiles. Distiller is a
>PostScript RIP, it only understands PostScript CSAs.
>
>The weakness in creating PDF from Distiller (all versions) is that
>you have to pass through a non-ICC process, and on the back end of
>that process you can then tag ICC profiles. But only after you loose
>your ICC spaces on the front end of the process.
>
>This is why you need something like GretagMacbeth iQueue to
>'normalize' your source color spaces into a single destination color
>space. Then build your PDF and tag it with that color space.
>
>A better way to create PDF 1.3 is from InDesign, though there are
>still some problems left here.
>
>>>
>>> UntagICC TagPSCM in PS6 = ICCBased
>>
>>which ICCBased (there isn't a ICC in the Photoshop 6 file)?
>
>PDF 1.3 supports three color space specifications: deviceColor,
>CIEBased and ICCBased. When you save out PDF from Photoshop 6, you
>create ICCBased. When you save out EPS from Photoshop 6, you are
>allowed to embed both the whole ICC profile and a CSA built from that
>ICC profile. This can cause problems.
>
>--
>Henrik Holmegaard
>TechWrite, Denmark
>_______________________________________________
>colorsync-users mailing list
>email@hidden
>http://www.lists.apple.com/mailman/listinfo/colorsync-users
>



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