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TIFF Bitmap with LZW Compression
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Format Description Properties
• ID: fdd000074
• Short name: TIFF_LZW
• Content categories: still image
• Format category: file format, bitstream encoding
• Last significant update: 2004-10-29
• Draft status: Full
Identification and description 
| 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 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 | |
| Is subtype of | TIFF_6 |
| Contains | LZW compression-encoded bitmap |
Local use
| LC experience or existing holdings | See TIFF_6 |
| LC preference | TIFF is one of the preferred formats for bitmapped images, although TIFF_UNC and TIFF_G4 are preferred to TIFF_LZW. |
Sustainability factors
| Disclosure | See TIFF_6 |
| 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. TIFF_LZW is listed but not preferred 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 | See LZW |
| Transparency | See LZW |
| Self-documentation | See TIFF_6 |
| External dependencies | None |
| Technical protection considerations | None |
Quality and functionality factors (still image)
| Normal rendering for still images | Good support. |
| Clarity (support for high image resolution) | See TIFF_6. |
| Color maintenance | See TIFF_6 |
| Support for graphic effects and typography | See TIFF_6 |
| Functionality beyond normal image rendering | See TIFF_6 |
File type signifiers
| Tag type | Value | Note |
| Filename Extension | See TIFF_6 | |
| Internet Media Type | See TIFF_6 | |
| Magic numbers | See TIFF_6 | |
Notes
Format specifications
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Last updated Monday, 06-Mar-2006 07:38:53 EST
