Why does Illustrator add white lines to my pattern when exporting?


I have an object in Illustrator with a chevron pattern that I created in Illustrator. When I export as a .png file or rasterize image file, it shows horizontal lines.

Anyone have a clue why it does this? I am at a complete loss. It's not the seams of the pattern.

Below is a .png file export of the image:

white lines

5/25/2014 2:01:00 PM

Accepted Answer

My solution was to save as a PDF, open it in photoshop and save it as the raster image. I believe it was poor anti-aliasing as @Scott suggested, which Photoshop handles much better. Art optimized did not improve the issue. It's not an idea solution by any means, but it does work.

6/29/2014 11:37:00 PM

Be certain to export with Art Optimized anti-aliasing selected.

Note the hairlines coincide with the dashes on the right. It's a flattening issue which Art Optimized will most likely solve.

If possible, placing a solid, pink-filled shape behind the chevrons would also probably solve the issue by providing the color which Illustrator should use to anti-alias.

This is one of those things with patterns in AI that irks me... poor anti-aliasing.