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Spriting Dictionary
Anti-Aliasing
Anti-Aliasing, often refered to as simply "AA", is a technique in which you place mid-tone pixels in strategical places to make lines appear smoother.
In the case shown to the right, the black line is anti-aliased by gray pixels placed on the 'corners', because the background is white (white+black=gray). If the line was red, then the gray dots should be changed to light pink to portray correct anti-aliasing.
Keep in mind that the image example was generated with Photoshop, thus creating a a lot of mid-tone pixels for aliasing. In spriting you would generally use far less aliasing, and place them in a more organised manner. They should only be placed in jagged places; if the line is already smooth without AA, there's no particular need to do it.
