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]
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]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
JPEG
Joint Photographics Expert Group (org., JTC1, RFC 1521, JPEG)
The Free On-line Dictionary of Computing (30 December 2018):
Joint Photographic Experts Group
JPEG
jpg
(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)