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Overprinting mystery

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    • #126649
      Youn Le Goff
      Participant

      I’ve spent the last 2 hours pulling my hair. I apparently did something wrong, it ended up with a bad print.
      Little context : I work for a B2B magazine, clients send us adds to insert in the magazine in PDF. I check those pdf for Resolution, Size, Crop Marks etc….
      I then import the pdf in my indesign file to place them where they are supposed to be. Then I export using a preset that is recommended by the Belgian association of printers : https://www.medibelplus.be/nl/downloads/index.jsp, then I send to print. I obviously get a print proof. In this case I was going on holiday, very tired and didn’t see the mistake on the Proof sent by the printer.
      On document A from the client : If I untick simulate overprinting, here is what I get : https://ibb.co/7g4w0sh no transparency problem, no overprinting etc…
      On document B (After exporting from Indesign) : If I untick simulate overprinting, part of the design disappear : https://ibb.co/HNW4VkB and that is what the final printed document ended up looking. Needless to say the client is unhappy and their studio say its my fault. I agree but I can’t see what I did wrong.
      The default view on acrobat is with “simulate overprinting” ticked so I din’t see that when sending to print.
      How can I export and not create overprinting issues that were not there in the first place ? Appart from manually checkin every add and make sure it is similar to the original, how can I change the way I work to not let that happen again ? First time in 8 years this happen.

    • #126653

      You are simulating with “U.S. Web coated (SWOP) profile?? You should always use the profile the pdf is made with, otherwise you cant trust what you see. Select the right profile, and thy again :)

      • #126661
        Youn Le Goff
        Participant

        Thank you for your help.
        So I did a flight check like in the article to determine the profile here is the result : https://ibb.co/ftKHzG8 It seems that there are multiple color spaces in this file. I tried viewing it in all the profiles I had and couldn’t see the problem in any of them. When opening the document in illustrator though, I found Stroke overprint on all the parts that produced the weird result. https://ibb.co/2vwnPMm
        I just don’t know how to avoid this in the future. I can’t open every pdf I get in adobe, followed by illustrator, followed by photoshop until I find a problem.
        How do you export your files to print ? do you have a preset you would recommend to avoid problems in the future ? I suspect my export preset is the source of the problem but I can’t be sure.

    • #126657
      David Blatner
      Keymaster
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