CCITT Group 4

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== Specifications ==
 
== 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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== Software ==
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* [[Farbfeld Utilities]]
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* [[ImageMagick]] (specify the file format as "GROUP4")
  
 
== References ==
 
== References ==

Revision as of 06:01, 28 October 2019

File Format
Name CCITT Group 4
Ontology
LoCFDD fdd000136
PRONOM x-cmp/15
CCITT Group 4 is a widely-used lossless compression algorithm for bitonal images. It is also known as T6, T.6, Fax4, G4, Group 4, or ITU-T Fax Group 4. It is frequently used in TIFF images created by scanning bitonal images.

It uses Modified Modified READ (MMR) compression. MMR is probably another synonym for CCITT Group 4.

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.

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References

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