JBIG
Sign in to saveAlso known as JBIG1, .jbg, .jbig, .bie, T.82
JBIG is an early lossless image compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82 in March 1993. It is widely implemented in fax machines. Now that the newer bi-level image compression standard JBIG2 has been released, JBIG is also known as JBIG1. JBIG was designed for compression of binary images, particularly for faxes, but can also be used on other images. In most situations JBIG offers between a 20% and 50% increase in compression efficiency over Fax Group 4 compression, and in some situations, it offer
Key facts
- File format.extension
- .jbg, .jbig
- File format.owner
- ISO, IEC, ITU-T
- File format.released
- 1993
- File format.genre
- Image file formats
- File format.extendedto
- JBIG2
- File format.standards
- ISO/IEC 11544, ITU-T Recommendations T.82, T.85
via Wikipedia infobox
Wikidata facts
Show 3 more facts
- file extension
- bie
- media type
- image/jbig
- publication date
- 1993-00-00
Sources (2)
via Wikidata · CC0
~2 min read
Article
4 sectionsContents
- Patents
- See also
- References
- External links
JBIG is an early lossless image compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82 in March 1993. It is widely implemented in fax machines. Now that the newer bi-level image compression standard JBIG2 has been released, JBIG is also known as JBIG1. JBIG was designed for compression of binary images, particularly for faxes, but can also be used on other images. In most situations JBIG offers between a 20% and 50% increase in compression efficiency over Fax Group 4 compression, and in some situations, it offers a 30-fold improvement.
JBIG is based on a form of arithmetic coding developed by IBM (known as the Q-coder) that also uses a relatively minor refinement developed by Mitsubishi, resulting in what became known as the QM-coder. It bases the probability estimates for each encoded bit on the values of the previous bits and the values in previous lines of the picture. JBIG also supports progressive transmission, which generally incurs a small overhead in bit rate (around 5%).