Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| 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 final-state format. |
| Relationship to other formats | |
| Is subtype of | TIFF_6 |
| Contains | ITU_G4, ITU-T Group 4 FAX Compression |
| LC experience or existing holdings | See TIFF_6 |
| LC preference | One of the preferred formats for bitmapped images. |
| Disclosure | See TIFF_6 |
| Documentation | See TIFF_6 |
| Adoption | TIFF_G4 is widely deployed in digital library projects as a master format and, in December 2005, the Government Printing Office (GPO) announced that TIFF_G4 had been selected as the master format for bitonal preservation images. Not supported by all browsers in native format, but, as of early 2004, new PC configurations tend to include a viewer. TIFF_G4 is acceptable for raster images in the list of FCLA recommended formats (Florida Center for Library Automation; www.fcla.edu/digitalArchive/pdfs/recFormats.pdf). |
| Licensing and patent claims | None for TIFF_G4 |
| Transparency | See ITU_G4 |
| Self-documentation | See TIFF_6 |
| External dependencies | None |
| Technical protection considerations | None |
| Normal rendering for still images | Good support. |
| Clarity (support for high image resolution) | See TIFF_6. TIFF_G4 is limited to bitonal (pure black and white) images. |
| Color maintenance | See TIFF_6 |
| Support for graphic effects and typography | See TIFF_6 |
| Functionality beyond normal image rendering | See TIFF_6 |
| Tag type | Value | Note |
| Filename Extension | See TIFF_6 | |
| Internet Media Type | See TIFF_6 | |
| Magic numbers | See TIFF_6 |
| General | |
| History |
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