Details: File format summary

Details for: CCITT T.6


Compression Name	CCITT T.6
Other names	CCITT Group 4
Identifier(s)	PUID: x-cmp/15
Family
Description	Officially known as CCITT T.6, Group 4 is a compression algorithm developed by the International Telegraph and Telephone Consultative Committee as a development of the two-dimensional Group 3 standard for encoding and compressing 1-bit (monochrome) image data. It is faster, and offers compression rates which are typically double those of Group 3. Like Group 3, it is lossless and designed for 1-bit images. However, being designed as a storage rather than transmission format, it does not incorporate the error detection and correction functions of Group 3 compression. Group 4 compression is most commonly used in the TIFF file format.
Lossiness	Lossless
Released	01 Jan 1989
Withdrawn
Developed by	International Telecommunication Union
Supported by
Documentation	CCITT Blue Book, 1989, Volume VII, Fascicle VII.3: Terminal equipment and protocols for telematic services, recommendations T.0 - T.63
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