CCITT Group 4
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{{FormatInfo | {{FormatInfo | ||
|formattype=electronic | |formattype=electronic | ||
| − | |subcat= | + | |subcat=Compression |
| + | |subcat2=Fax formats | ||
| + | |locfdd={{LoCFDD|fdd000136}} | ||
|pronom={{PRONOM|x-cmp/15}} | |pronom={{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. | |
| − | [[CCITT Group 4]] is a widely used lossless compression algorithm | + | |
It uses [[Modified Modified READ]] (MMR) compression. '''MMR''' is probably another synonym for CCITT Group 4. | It uses [[Modified Modified READ]] (MMR) compression. '''MMR''' is probably another synonym for 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] | ||
| + | |||
| + | == Software == | ||
| + | * [[Farbfeld Utilities]] | ||
| + | * [[ImageMagick]] (specify the file format as "GROUP4") | ||
== References == | == 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] | ||
| − | [[Category: | + | [[Category:Graphics]] |
| + | [[Category:Fax]] | ||
Latest revision as of 01:33, 25 August 2020
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 |
[edit] 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.
[edit] See also
[edit] Specifications
[edit] Software
- Farbfeld Utilities
- ImageMagick (specify the file format as "GROUP4")
