Skip navigation
Currently Being Moderated

Pdf colourspace in an InDesign file

Jul 24, 2012 9:34 AM

I am working on a small booklet in InDesign which contains around 20 small examples of work completed in Illustrator, pdf and other formats.

 

At prepress some of the pictures are showing as RGB, even though the Package report in InDesign says "0 use RGB space".

 

When I opened some attached files in Illustrator they were in RGB, which I changed to CMYK. However, I cannot open in Illustrator some of the pdf pictures because I do not have some of the fonts.

 

How can I check a 3rd party PDF to see that it is in CMYK or RGB and if in RGB, how can I change it to CMYK.

 

And why is InDesign showing that "0 use RGB space" when some attached pictures/logos are in RGB space?

 

Thanks for any help.

 
Replies
  • Currently Being Moderated
    Jul 24, 2012 9:53 AM   in reply to James_233

    Open it in Acrobat and check it there.

     

     

     

    Bob

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 24, 2012 9:54 AM   in reply to James_233

    BTW, what exactly is wrong with having properly tagged RGB images?

     

     

     

    Bob

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 24, 2012 11:31 AM   in reply to James_233

    @James – if you are using Acrobat Pro 8 or 9, you'll find at least two palettes which come handy for prepress use:

     

    Advanced / Print Production / Output Preview

     

    If you like you can go to "Show": "RGB" and you will see RGB objects only…

     

     

    Advanced / Print Production / Preflight

     

    In the "Preflight" panel there are a lot of  profiles for analyzing and fixing issues.

    You could define your own  or alter pre-defined ones.

     

    If you are using Acrobat Pro X, you'll find the two panels at other places…

     

    Note: a PDF could hold a lot of color spaces; it's not an "either / or", it could easily be an "and" (RGB and CMYK and Gray and Lab …).

     

    Uwe

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 24, 2012 11:36 AM   in reply to James_233

    Is it possible some images were pasted instead of placed? I'm not sure prefilght would pick up the RGB in that case.

     
    |
    Mark as:
  • Rob Day
    3,122 posts
    Oct 16, 2007
    Currently Being Moderated
    Jul 24, 2012 3:36 PM   in reply to James_233

    why did InDesign's package report that "0 use RGB space" when some were in RGB space?

     

    Because PDF files can contain objects with different color spaces there's no way of knowing what it's resolution, color space, or color profile is—if you select a PDF and look at the Info Panel actual and effective resolution, color space, and color profile are blank.

     

    How can I check a 3rd party PDF to see that it is in CMYK or RGB and if in RGB, how can I change it to CMYK.

     

    You can convert all of the RGB objects in the layout or inside of a placed PDF to any CMYK space by exporting the ID document to PDF. If you export via the default PDF/X-1a preset all color except spot color is converted to your document's CMYK space. If an RGB object has an assigned profile the conversion is from its assigned RGB space to document CMYK.

     
    |
    Mark as:
  • Rob Day
    3,122 posts
    Oct 16, 2007
    Currently Being Moderated
    Jul 26, 2012 6:52 AM   in reply to James_233

    How can I check a 3rd party PDF to see that it is in CMYK or RGB and if in RGB, how can I change it to CMYK.

     

    If for some reason you don't want to export your ID document to a CMYK pdf, you can convert the provided PDFs to CMYK in AcrobatPro via Tools>Print Production>Convert Colors.

     

    RGB shouldn't be a prepress problem anymore—accurate color managed conversions to CMYK can be made via Export or Print from ID.

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 26, 2012 7:00 AM   in reply to James_233

    James_233 wrote:

     

    Hi Peter

    None of the pix were embedded. However, all of the pix were legacy Illustrator files. I wonder if InDesign CS6 is not recognising RGB space from legacy Illustrator files. If so, there is a bug.

     

    Can you test it out? However, you have answered before and you are a PC man. I am on a Mac.

    PC or Mac makes no difference, but you should go back and look at Rob's previous answer about PDF, becasue I think that's what you are seeing with preflight. Illustrator has been PDF for years.

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 26, 2012 7:24 AM   in reply to James_233

    I think I'm lost now about what the problem is, exactly.

     

    I think we've explained why preflight might not find RGB. What version of ID are you using, by the way? Your description "0 use RGB Color Space" sounds like the preflight fom the package command, not the live preflight available since CS4. Live Preflight can be set to flag RGB used in PDF, but the same file will not show an RGB warning in the package preflight.

     

    The real question, though is what export settings you are using, and why you aren't converting to a CMYK space on export if the printer doesn't want to handle the conversion on his end.

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 26, 2012 8:58 AM   in reply to James_233

    All of the links you're showing with no color space are either .ai or PDF. ID just doesn't report the color space for those because it can be mixed.

     

    As far as whether the package command used to pick up the RGB, I couldn't say that it ever did. Can you test on an earlier version with the same PDF? I wonder if in the past you either didn't have PDFs with RGB in them, or if you did a conversion to CMYK on export and that's why you never saw this before. Sending a file with colors preserved is a relatively new workflow (generally we're talking about sending PDF/X-4 to a printer who specifies that they can handle it) and it would be far more common to have converted to CMYK at output. You haven't told us waht PDF settings you use now, or if they are the same as previously.

     
    |
    Mark as:
  • Rob Day
    3,122 posts
    Oct 16, 2007
    Currently Being Moderated
    Jul 26, 2012 9:00 AM   in reply to James_233

    I have just noticed that in the links palette the color space shows CMYK for some files, but no RGB. They are blank, even though I have since changed them to CMYK. I attach a screen shot to show you what I mean.

    See post #7. ID's Info has never shown color space or profiles for .ai or .pdf

     

    The export settings I am using are the built-in pre-press ones.

     

    Use the PDF/X-1a preset if you don't want RGB objects in the PDF.

     
    |
    Mark as:
  • Currently Being Moderated
    Jul 26, 2012 9:12 AM   in reply to Peter Spier

    Sorry, I seem to have missed the line about the export settings.

     

    Not sure what you mean about the "prepress" ones since there are none specifically labelled Prepress. Both PDF/X-1a and "Press Quality" should be converting to a CMYK profile. "High Qulaity Print" preserves existing colors.

     
    |
    Mark as:

More Like This

  • Retrieving data ...

Bookmarked By (0)

Answers + Points = Status

  • 10 points awarded for Correct Answers
  • 5 points awarded for Helpful Answers
  • 10,000+ points
  • 1,001-10,000 points
  • 501-1,000 points
  • 5-500 points