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I am creating a PDF for printing, and I got some weird artifacts on places where elements with the same color overlap. My workflow is from Illustrator to InDesign to PDF, and to be honest I dont know where the problem comes from.

Here is a screenshot of what I mean :

enter image description here Here you can see it on the brownish-beige part

Here is another one where you can see that they are really overlapping The lower beige part is on top of the upper one, whose green outlines you can see

enter image description here

The weird thing is, it depends on the actual Zoom level whether or not you see the line. How can I get rid of this? I am scared this will be visible on the print later on...

INSERT: These screenshots are from Illustrator CC2017.1.0 on Mac. The problem is visible also in InDesign, Acrobat and Adobe reader. The problematic shapes are only simple paths - one triangle and one half circle.

  • It's completely impossible to see anything from just a thin line from a screen shot. Please edit your post to include more of the graphics so we can see what type of shapes and objects we’re dealing with and how they overlap. If it depends on the zoom level, there's a good chance it's a screen artefact that won't show up when printing, but at the very least we need to see what's going on in order to be able to give a reasonably educated guess. – Janus Bahs Jacquet Jul 8 '17 at 9:46
  • Ok, sorry, I tought you were able to see it on the left and right , ill add some images – Tom Jul 8 '17 at 9:50
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    Ah, that’s much better—now it’s clear what’s intentional and what’s artefact. That definitely looks like screen artefacting to me. If you want to be entirely sure, you can always combine the two beige shapes into a compound shape. If the artefacts remain after that, then there’s something not right. – Janus Bahs Jacquet Jul 8 '17 at 10:02
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    Possible Duplicate: graphicdesign.stackexchange.com/questions/38598/… – Scott Jul 8 '17 at 18:59
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If it Starts from Illustrator given it is a vector file. Can you check if the shape that have same color separated from each other? If Yes Merge them with Path Finder or Shape Builder Tool to eliminate that line.

A. Select the upper and lower path; then Pathfinder>Unite enter image description here

B. Select the upper and lower path; Shift+M then Click and Drag to the two Separated Shapes enter image description here

If it is not separated in vector or Ai format; based on my experience I guess the problem is the exporting from InDesign to PDF. Check your PDF Settings maybe it is low PDF type that it it chop some files. But surprisingly it is the only shape affected and the others are Okay. :-)

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