Hi. We’re using InDesign CS6 and have a couple empty frames stacked vertically with solid fills used for background elements. These sit over a photograph.
We are noticing what looks like a thin stroke, a bit lighter, where the frames meet. Like a bit of a ‘halo’. it’s pretty apparent on a final PDF (exported using PDF/X-4). But you can also see when setting to overprint preview in InD. It appears like a transparency effect if one was just slightly overlaying the other. But this is not the case.
I’ve checked the frames, and they are exactly butted up to each other (checked the numbers in Transform palette). There is no overlap, nor is there any space between (if the numbers can be trusted). Each has a solid fill but does use a gradient feather so they fade out on one end. The feather is set to 0º, so it runs completely horizontally across frames (perpendicular to how boxes meet on tops/bottoms).
When I view separations in the ‘Separations Preview’ in InD (background photo turned off), I see a brief change in the numbers when I hover right around where the frames meet (probably no more than a pixel or two high). This is at highest magnification. I tried disabling the gradient feather effect, but I still see a brief change in the numbers. So something appears to be actually happening there.
– Does InDesign use antialiasing on frame borders?
This is the only thing I could think that it might be. If so, any way to disable for completely rectangular frames that don’t need it?
– If not antialiasing, any other ideas what might cause this type of thing? I thought it might be an optical illusion, but why would the numbers jump in separations preview?!?
Thanks!
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