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Help with overprinting black

Aug 21, 2013 1:04 PM

Tags: #pre-press #prepress #overprinting

I've been reading about overprinting black, and while I know I should mark black type against a lighter backround as overprinting under Attributes, I'm getting confused about other areas that may need overprinting.


The project details are: Textbook is printed in C+K only. I'm creating graphics in Illustrator, applying overprinting to black areas (black is 100K only, as its two plates) sending to TIFF (project process, can't change at this point), and placing in InDesign, which produces the final pdfs.


Here's my question - should I be overprinting the black icons as well as the text in the circles? Should I be worried about the little white windows in the buildings in the central circle and the white dollar signs in the bottom circle? (If you can spot any other potential prepress issues with this, please advise! I'm a prepress newbie.)


Thanks so much for your help!!


  • Currently Being Moderated
    Aug 21, 2013 2:07 PM   in reply to mfmiller3000

    Without getting the actual file to inspect it is sometimes hard to say, but at first glance I would agree that setting all black objects you're talking about to overprint should be safe.


    As for the white objects you mentioned: Make sure they are not set to overprint.


    In general: Always check your files with View > Overprint Preview.

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  • Currently Being Moderated
    Aug 21, 2013 2:23 PM   in reply to mfmiller3000

    Yes, do it.


    If you've got further questions just talk to your print provider.

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  • Currently Being Moderated
    Aug 21, 2013 4:03 PM   in reply to mfmiller3000

    Remember that an overprinted black may sometimes show if it is printed over a partly-coloured background.

    In some cases it may be better to use the colour of the background plus 100% K than overprinting the black.

    Like this:

    Picture 1.png

    I have deliberately desaturated the black to clarify my point, but this is well worth considering, especially when printing on soft papers.

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  • Currently Being Moderated
    Aug 22, 2013 5:07 AM   in reply to mfmiller3000

    Basically yes.

    You might get away with a sort of average mixture of cyan and black.


    Don’t worry about paper stock to start with.

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