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I'm an Illustrator beginner, and I have just made pie chart. I removed the borders but I still end up with a 1 pixel wide border between the pieces of the pie whenever I export to PDF or AI. Please see the attached image (zoomed to make it easier to spot it).

enter image description here

The question is: How do I get rid of it?

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up vote 7 down vote accepted

See this for an explanation: Strange bordering in Illustrator

The white "lines" are due to anti-aliasing. They aren't actually lines, but minute gaps between shapes and for a pixel display the anti-aliasing uses the background color as a base. In your case the yellow.

  • You can add a circle behind the chart and fill it with the same color red and the white anti-aliasing will disappear.
  • You can group the chart (if it isn't already grouped) then add a new Fill via the Appearance panel. Color the new fill the same red, and move it below the [contents] item in the Appearance Panel.
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