White lines appearing in my illustration - what's wrong, and how do I remove it?

Question

Hello!

I've been struggling with this one pesky problem in this dog illustration I'm making: when I clip the black spots onto the white dog beneath, this thin white line keeps appearing at the edge of the image. It may have to do with illustrator's anti-aliasing feature, because when I turn it off the line goes away - but then the illustration becomes a choppy, pixellated mess that I can't use. Is there a way I can get rid of the white lines while keeping the anti-alias intact? Thank you!

Ton Frederiks · Accepted Answer

Thanks, often these are visible when objects touch each other.

The line in the ear can be solved by joining the grey parts, Pathfinder Unite or dragging with the Shape Builder tool.

The blue background can be replace by a single blue rectangle in the background.

Before exporting as an image, Rasterize the file with Art Optimized anti-aliasing may also help. Best done as an Effect or on a copy.

Bill Silbert · Answer

If you either print the illustration or make a PDF does the white line appear? If not then try turning off GPU Performance in the Performance section of Illustrator's Settings (Preferences).

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