| |
| 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| Withdrawn |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 |
| Rights |
|
| Note |
|
 Top of page
|
|
Details: File format summary
: detailed report on compression type 
