Anti-aliasing Graphics
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There's a simple technique to anti-alias graphics that you should keep in mind when creating graphics with Painting (Anti-aliasing is somtimes called smoothing. If you don't know what it is, check out MacKiDo.).

If you use the Scale command from the Painting menu to shrink a graphic, Painting will anti-alias the resulting image (shrinking it down to 50% of the original size is usually fine). If you want your graphics to be anti-aliased, create the extra large so you can scale them down when you're done. If you want to quickly preview what it will look like shrunk, just zoom out your document to 50% with the Zoom tool.

The image on the left is the original. The image on the right is scaled down 50%, and looks much smoother. There are no jagged edges around the image.