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An acronym for Joint Photographic Experts Group. It is used to refer to a file compression standard created by the committee. It is a lossy meaning some digital information is lost during compression and cannot be restored. Colour information is reduced because the human eye is more sensitive to brightness (value) variations than colour variations. The image is divided into 8x8 pixel blocks and each of these is compressed further using complex algorithms. In highly compresses JPEG images the 8x8 blocks and blurry colour can be seen. File extentions used for this file format are usually .jpg and .jpeg although .jpe, .jfif, and .jif are also used. JPEG images are often imbedded in other file formats as well.