- A data operation commonly used in computer graphics in which several bitmaps are combined into one using a Boolean function. The operation involves at least two bitmaps: a “source” (or “foreground”) and a “destination” (or “background”), and possibly a third that is often called the “mask.” The result may be written to a fourth bitmap, though often it replaces the destination. The pixels of each are combined bitwise according to the specified raster operation, and the result is then written to the destination. Modern graphics software has almost completely replaced bitwise operations with more general mathematical operations used for effects, such as alpha compositing. ← Wikipedia
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