JPEG

from The Collaborative International Dictionary of English v.0.48

Compression \Com*pres"sion\, n. [L. compressio: cf. F.
   compression.]
   1. The act of compressing, or state of being compressed.
      "Compression of thought." --Johnson.
      [1913 Webster]

   2. (Computers) reduction of the space required for storage
      (of binary data) by an algorithm which converts the data
      to a smaller number of bits while preserving the
      information content. The act of compressing [3].

   Note: Compression may be {lossless compression}, in which all
         of the information in the original data is preserved,
         and the original data may be recovered in form
         identical to its original form; or {lossy compression},
         in which some of the information in the original data
         is lost, and decompression results in a data form
         slightly different from the original. {Lossy
         compression} is used, for example, to compress audio or
         video recordings, and sometimes images, where the
         slight differences in the original data and the data
         recovered after {lossy compression} may be
         imperceptable to the human eye or ear. The {JPEG}
         format is produced by a {lossy compression} algorithm.
         [PJC]

from The Collaborative International Dictionary of English v.0.48

JPEG \JPEG\ n. [Acronym from Joint Picture Experts Group.]
   (Computers)
   A standardized format for storing graphic data in binary
   computer files, allowing over 16 million different colors. It
   allows for lossy compression, i. e. the compression of data
   into a form which re-expands into an image close, but not
   identical to the original image. Files stored in this format
   usually carry the extension jpg or jpeg. Compare {GIF}.
   [PJC]

from The Free On-line Dictionary of Computing (8 July 2008)

Joint Photographic Experts Group
JPEG
jpg

   <image, body, file format, standard> (JPEG) The original name
   of the committee that designed the standard {image}
   {compression} {algorithm}.  JPEG is designed for compressing
   either {full-colour} or {grey-scale} {digital} images of
   "natural", real-world scenes.  It does not work so well on
   non-realistic images, such as cartoons or line drawings.  JPEG
   does not handle compression of black-and-white (1
   bit-per-pixel) images or {moving pictures}.  Standards for
   compressing those types of images are being worked on by other
   committees, named {JBIG} and {MPEG}.

   (http://jpeg.org/).

   {Filename extension}: .jpg, .jpeg.

   See also {PJPEG}.

   (2000-09-11)