Sustainability of Digital Formats: Planning for Library of Congress Collections |
|
![]() |
|
Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact |
Full name | TIFF, Group 4 Compressed Bitmap |
---|---|
Description | A tag-based file format for storing and interchanging raster images; in this subtype, TIFF wraps a bitmap compressed using ITU_G4 (ITU-T T.6. Facsimile Coding Schemes and Coding Control Functions for Group 4 Facsimile Apparatus), and is thus limited to bitonal imaging, suitable for the reproduction of typographic or line-art originals. |
Production phase | Most often an initial-state or middle-state format; may serve as a final-state format. |
Relationship to other formats | |
Subtype of | TIFF_6, TIFF, Revision 6.0 and earlier |
Contains | ITU_G4, ITU-T Group 4 FAX Compression |
LC experience or existing holdings | See TIFF_6 |
---|---|
LC preference | See the Library of Congress Recommended Formats Statement for format preferences for still image works. |
Disclosure | See TIFF_6 |
---|---|
Documentation | See TIFF_6 |
Adoption |
TIFF_G4 has been widely deployed in digital library projects as a master format for bitonal images, typically scanned pages of printed text. In December 2005, the Government Printing Office (GPO) announced that TIFF_G4 had been selected as the master format for bitonal preservation images. TIFF_G4 has also been widely used for scanning business documents into document management systems. Not supported by all browsers in native format, but, since the early 2000s, new PC configurations usually include a viewer. TIFF_G4 is acceptable as an image format in most institutional and archival repositories. See, for example, File Formats and Guidelines: Digital Preservation from Harvard University Libraries. Link via Internet Archive. |
Licensing and patents | None for TIFF_G4 |
Transparency | See ITU_G4 |
Self-documentation |
See TIFF_6 Accessibility Features See TIFF_6 |
External dependencies | None |
Technical protection considerations | None |
Still Image | |
---|---|
Normal rendering | Good support. |
Clarity (high image resolution) | See TIFF_6. TIFF_G4 is limited to bitonal (pure black and white) images. |
Color maintenance | See TIFF_6 |
Support for vector graphics, including graphic effects and typography | See TIFF_6 |
Functionality beyond normal rendering | See TIFF_6 |
Tag | Value | Note |
---|---|---|
Filename extension | See related format. |
See TIFF_6 |
Internet Media Type | See related format. |
See TIFF_6 |
Magic numbers | See related format. |
See TIFF_6 |
Pronom PUID | See notes |
See http://www.nationalarchives.gov.uk/PRONOM/fmt/353 for TIFF. Pronom does not differentiate versions of TIFF. |
Wikidata Title ID | See notes |
See https://www.wikidata.org/wiki/Q215106 for TIFF Family. |
General | |
---|---|
History |
See TIFF_6
See TIFF_6.
|