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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: Henrik Holmegaard <email@hidden>
  • Date: Sun, 6 May 2001 16:49:13 +0200

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


References: 
 >Re: Distiller 5 CSA to ICC matrix (From: Mauro Boscarol <email@hidden>)

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