I am creating a background with grey-scale shading underneath and am adding colour by overlaying a coloured box with a "screen" transparency. (see attached)
Oddly, when I do this, what were invisible lines (the shapes of the background objects) now show as dotted stroked lines. I cannot figure out what is causing this. Any help would be appreciated. I am using CS6.
Try this: SampleFile.ai - Google Drive
Thank you.
Thank you for the file.
I tried to set up a demo file myself, but could not trigger it.
In your file it's visible.
It's just bad rendering. In the current version with the improved GPU acceleration, this effect is gone. But that doesn't help you.
Depending on the printing process this might or might not become a problem.
You might try if selecting all and then Object > Flatten transparency helps.
But only do this on a copy, because it won't be easily editable afterwards.
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