CCITT Group 4

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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.
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[[CCITT Group 4]] is a widely used lossless compression algorithm used for bitonal images. It is also known as '''T6''', '''T.6''', '''Fax4''', '''G4''', or '''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.
 
It is based on [[Modified Modified READ]] (MMR) compression.
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In a [[TIFF]] file, compression type 4 is CCITT Group 4.
 
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).
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Other formats that can use CCITT Group 4 compression include [[PDF]] and [[SPIFF]].
  
 
== See also ==
 
== See also ==

Revision as of 20:33, 28 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 T6, T.6, Fax4, G4, or 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.

Other formats that can use CCITT Group 4 compression include PDF and SPIFF.

See also

Specifications

References

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