CCITT Group 4

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[[CCITT Group 4]] is a widely used lossless compression algorithm used for bitonal images. It is frequently used in [[TIFF]] images created by scanning bitonal images.
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[[CCITT Group 4]] is a widely used lossless compression algorithm used for bitonal images. It is also known as '''T.6''', '''Fax 4''', and '''ITU-T Fax Group 4'''. It is frequently used in [[TIFF]] images created by scanning bitonal images.
  
== References ==
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It is based on [[Modified Modified READ]] (MMR) compression.
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== Related formats ==
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In a [[TIFF]] file, compression type 4 is CCITT Group 4.
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In theory, CCITT Group 4 can be used in [[SPIFF]] files (compression type 3).
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== See also ==
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* [[CCITT Group 3]]
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== Specifications ==
 
* [http://www.itu.int/rec/T-REC-T.6-198811-I/en T.6 : Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus]
 
* [http://www.itu.int/rec/T-REC-T.6-198811-I/en T.6 : Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus]
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== References ==
 
* [http://www.digitalpreservation.gov/formats/fdd/fdd000136.shtml ITU-T Group 4 FAX Compression (T.6), from Library of Congress resource on Sustainability of Digital Formats]
 
* [http://www.digitalpreservation.gov/formats/fdd/fdd000136.shtml ITU-T Group 4 FAX Compression (T.6), from Library of Congress resource on Sustainability of Digital Formats]

Revision as of 18:00, 26 February 2013

File Format
Name CCITT Group 4
Ontology
PRONOM x-cmp/15
CCITT Group 4 is a widely used lossless compression algorithm used for bitonal images. It is also known as T.6, Fax 4, and ITU-T Fax Group 4. It is frequently used in TIFF images created by scanning bitonal images.

It is based on Modified Modified READ (MMR) compression.

Contents

Related formats

In a TIFF file, compression type 4 is CCITT Group 4.

In theory, CCITT Group 4 can be used in SPIFF files (compression type 3).

See also

Specifications

References

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