Complete Protocol dictionary, glossary and reference
JPEG: Joint Photographic Experts Group
Joint Photographic Experts Group (JPEG) is commonly used standard method of lossy compression for photographic images. The file format which employs this compression is also called JPEG. The common file extensions for this format are .jpeg, .jfif, .jpg, .JPG, or .JPE. JPEG itself specifies only how an image is transformed into a stream of bytes, but not how those bytes are encapsulated in any particular storage medium. A further standard, created by the Independent JPEG Group, called JFIF (JPEG File Interchange Format) specifies how to produce a file suitable for computer storage and transmission (such as over the Internet) from a JPEG stream. In common usage, when one speaks of a "JPEG file" one generally means a JFIF file, or sometimes an Exif JPEG file. There are, however, other JPEG-based file formats, such as JNG, and the TIFF format can carry JPEG data as well.