ISO/IEC 14492:2019
(Main)Information technology — Lossy/lossless coding of bi-level images
Information technology — Lossy/lossless coding of bi-level images
This Recommendation | International Standard defines methods for coding bi-level images and sets of images (documents consisting of multiple pages). It is particularly suitable for bi-level images consisting of text and dithered (halftone) data. The methods defined permit lossless (bit-preserving) coding, lossy coding, and progressive coding. In progressive coding, the first image is lossy; subsequent images may be lossy or lossless. This Recommendation | International Standard also defines file formats to enclose the coded bi-level image data.
Technologies de l'information — Codage avec ou sans perte des images au trait
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INTERNATIONAL ISO/IEC
STANDARD 14492
Second edition
2019-03
Information technology — Lossy/
lossless coding of bi-level images
Technologies de l'information — Codage avec ou sans perte des
images au trait
Reference number
ISO/IEC 14492:2019(E)
©
ISO/IEC 2019
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ISO/IEC 14492:2019(E)
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ii © ISO/IEC 2019 – All rights reserved
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ISO/IEC 14492:2019 (E)
FOREWORD
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This document was prepared by ITU-T as ITU-T Rec. T.88 (2018) and drafted in accordance with its editorial
rules. It was adopted by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee
SC 29, Coding of audio, picture, multimedia and hypermedia information.
This second edition cancels and replaces the first edition (ISO/IEC 14492:2001), which has been technically
revised. It also incorporates ISO/IEC 14492:2001/Amd.1:2004, ISO/IEC 14492:2001/Amd.2:2003 and
ISO/IEC 14492:2001/Amd.3:2012.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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© ISO/IEC 2019 – All rights reserved ITU-T Rec. T.88 (2018 E) iii
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INTERNATIONAL STANDARD ISO/IEC 14492
RECOMMENDATION ITU-T T.88
Information technology – Lossy/lossless coding of bi-level images
Summary
Rec. ITU-T T.88 | ISO/IEC 14492, commonly known as JBIG2, defines a coding method for bi-level images (e.g., black
and white printed matter). These are images consisting of a single rectangular bit plane, with each pixel taking on one of
just two possible colours. This Recommendation | International Standard has been explicitly prepared for a lossy,
lossless, and lossy-to-lossless image compression.
History
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Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T T.88 2000-02-10 8 11.1002/1000/4845
1.1 ITU-T T.88 (2000) Amd. 1 2003-06-29 16 11.1002/1000/6388
1.2 ITU-T T.88 (2000) Amd. 2 2003-06-29 16 11.1002/1000/6389
1.3 ITU-T T.88 (2000) Amd. 3 2011-05-14 16 11.1002/1000/11312
2.0 ITU-T T.88 2018-08-29 16 11.1002/1000/13688
Keywords
Bi-level images; image compression; lossy image compression; lossless image compression; lossy-to-lossless image
compression; JBIG.
*
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