Definition
According to About.com, the definition of anti-aliasing is a technique of blending bitmap-based images and text to reduce the stair-stepping or jagged appearance. In areas of transition, the edge pixels are blended to give a smoother appearance. Here is an example:
Application
As a general rule, use anti-aliased text with web applications and aliased text with print application. When using Photoshop, there are five options to choose from - none, sharp, crisp, strong, or smooth. You can find these options in the tool menu bar with the text tool selected.
When using Illustrator, there are only three options - none, art optimized (supersampling), or type optimized (hinted). These options are found under the effects menu and selecting rasterize
Your choice when using any of these options will be based on the type size and type face that you are using.
Extras
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