Anti-Aliasing The difference between aliased (top) and anti-aliased images Anti-aliasing smooths out the jagged edges between solid colors. Because the process adds more intermediate colors, the image becomes much less compressible. To keep the file size down, anti-alias with the fewest number of colors possible. Notice on the middle image above that the horizontal and vertical lines do not need anti-aliasing, while the 45 degree line is only marginally improved. If you use any other angle or curve, anti-aliasing becomes a necessity.
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