The Joint Bi-level Image Experts Group (JBIG) is a group of experts nominated by national standards bodies and major companies to work to produce standards for
bi-level image
A binary image is one that consists of pixels that can have one of exactly two colors, usually black and white. Binary images are also called ''bi-level'' or ''two-level'', Pixelart made of two colours is often referred to as ''1-Bit'' or ''1b ...
coding. The "joint" refers to its status as a committee working on both
ISO and
ITU-T standards. It is one of two sub-groups of
ISO/
IEC Joint Technical Committee 1, Subcommittee 29, Working Group 1 (ISO/IEC JTC 1/SC 29/WG 1), whose official title is ''Coding of still pictures''.
The Joint Bi-level Image Experts Group created the
JBIG and
JBIG2
JBIG2 is an image compression standard for bi-level images, developed by the Joint Bi-level Image Experts Group. It is suitable for both lossless and lossy compression. According to a press release from the Group, in its lossless mode JBIG2 typic ...
standards.
The group often meets jointly with the JPEG committee, which typically meets three times annually.
SC29 Working Group 1 (working together with ITU-T Study Group 16 –
VCEG and previously also with Study Group 8 – SG8) is responsible for both
JPEG
JPEG ( ) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and imag ...
and JBIG standards. It includes two sub-groups: the
Joint Photographic Experts Group (JPEG SG) and the Joint Bi-level Image experts Group (JBIG SG).
In the mid-1980s, both CCITT (now ITU-T) and ISO had standardization groups for image coding: CCITT Study Group (SG) VIII (Telematic Services) and ISO TC97 SC2 WG8 (Coding of Audio and Picture Information).
They were historically targeted on image communication. In 1986, it was decided to create the Joint (CCITT/ISO) Photographic Expert Group. In 1988, it was decided to create the Joint (CCITT/ISO) Bi-level Image Group – JBIG.
Published Standards
JBIG have developed following standards, which were published by ISO/IEC and/or ITU-T:
Note: The published JBIG2 standard was revised by later amendments.
See also
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Joint Photographic Experts Group (JPEG)
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Moving Picture Experts Group
The Moving Picture Experts Group (MPEG) is an alliance of working groups established jointly by ISO and IEC that sets standards for media coding, including compression coding of audio, video, graphics, and genomic data; and transmission and f ...
(MPEG)
References
External links
Official JBIG page
Graphics file formats
Working groups
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