Sustainability of Digital Formats: Planning for Library of Congress Collections |
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Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact |
Full name | TIFF Bitmap with LZW Compression |
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Description | A tag-based file format for storing and interchanging raster images; in this subtype, TIFF wraps a bitmap compressed using LZW (Lempel-Ziv-Welch Compression Encoding). |
Production phase | Most often an initial-state or middle-state format; may serve as final-state format. |
Relationship to other formats | |
Subtype of | TIFF_6, TIFF, Revision 6.0 and earlier |
Contains | LZW, LZW Compression Encoding |
LC experience or existing holdings | See TIFF_6 |
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LC preference | See the Library of Congress Recommended Formats Statement for format preferences for still image works. |
Disclosure | See TIFF_6 |
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Documentation | See TIFF_6 |
Adoption | TIFF_LZW has seen some use in digital library projects but has not been as widely deployed as TIFF_UNC and TIFF_G4. For a typical example of recommendations, see the File Formats and Guidelines: Digital Preservation from Harvard University Libraries (http://hul.harvard.edu/ois/digpres/guidance.html). TIFF_LZW is listed below TIFF_UNC and TIFF_G4 in the order of preference for deposit in the library's repository system. In a study of four compressed image formats considered as alternatives to TIFF_UNC by the Koninklijke Bibliotheek (National Library of the Netherlands) in 2008, TIFF LZW ranked lowest. |
Licensing and patents | See LZW |
Transparency | See LZW |
Self-documentation | See TIFF_6 |
External dependencies | None |
Technical protection considerations | None |
Still Image | |
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Normal rendering | Good support. |
Clarity (high image resolution) | See TIFF_6. |
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 |
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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 |
General | |
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History |
See TIFF_6
See TIFF_6
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