Distinguish between bitblt and pixblt, Computer Graphics

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Distinguish between bitBlt and pixBlt?

Raster functions that manipulate rectangular pixel arrays are usually referred to as raster ops. Moving a block of pixels from one location to another is also known as a block transfer of pixel values. On a bilevel system, this operation is known as a bitBlt (bit-block transfer), on multilevel system t is known as pixBlt.

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