In digital image processing, anti-aliasing is the technique of smoothing transitions between color fields within an image. Anti-aliasing is used in digital photography, computer graphics, digital audio, and many other applications.
Anti-aliasing creates transition pixels between two or more areas of differing colors. The transition pixels are a blend of color and transparency based upon the surrounding color fields. These transition pixels help what would traditionally be seen as a "jagged", "stair-stepped", or "rough" edge appear as smooth and fluid to the human eye.