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Best Practices for Digital Imaging and Metadata

Best Practices for Digital Imaging and Metadata. Roy Tennant The Library, University of California, Berkeley. http://sunsite.berkeley.edu/~manager/Presentations/ICDE/. Best Practices: Image Capture. 600 dpi or greater (or, 6000 pixels in longest dimension) 24 bit color or greater

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Best Practices for Digital Imaging and Metadata

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  1. Best Practices for Digital Imaging and Metadata Roy Tennant The Library, University of California, Berkeley http://sunsite.berkeley.edu/~manager/Presentations/ICDE/

  2. Best Practices: Image Capture • 600 dpi or greater (or, 6000 pixels in longest dimension) • 24 bit color or greater • Use a standard target for uniform capture

  3. Best Practices: Image Formats • Archival version: uncompressed TIFF • Preview: Compuserve GIF • Screen: JFIF (JPEG), medium quality • Printing: JFIF (JPEG), medium - high quality

  4. Imaging Workflow Capture Master Image Place on Long-Term Storage TIFF Create Version for Printing Available Online Create Version for Viewing Create Version for Previewing TIFF or JPEG JPEG GIF

  5. Metadata Definitions • Cataloging • Data about data • “structured description” • “ an object or collection of objects” • Structured description of an object or collection of objects

  6. Types of Metadata • Descriptive • Administrative • Structural

  7. Descriptive Metadata • Purposes: • to provide access points (discovery) • to describe the intellectual characteristics of an item • Example elements: • Author • Title • Subject

  8. Best Practices:Descriptive Metadata • Capture as much as you can • Use controlled vocabularies and authority control • Use standards or draft standards, e.g.,: • MARC • Dublin Core

  9. Administrative Metadata • Purposes: • to enable the appropriate management of the object • Examples: • Rights • File format • File size

  10. Best Practices:Administrative Metadata • Enough metadata to: • Understand what you have • Be able to manipulate/process it via software • Be able to manage it over time • Examples: • File date, file type, source type, compression format, color space,

  11. Structural Metadata • Purposes: • to provide a structure that enables an object to be used appropriately • to associate a file with other, related files that may comprise a single intellectual item • Examples: • Page one • Section heading

  12. Best Practices:Structural Metadata • Capture enough structural information to: • Present the object as a navigable whole • Allow the user to identify and display key elements (e.g., chapter headings) • Allow the user to limit their search to particular parts • Follow standards or best practices as they emerge

  13. What Elements to Capture • Key questions: • What is the least you can get by with? • What is the most that might be needed? • What is a reasonable point between the two? • Considerations: • Cost • Usefulness • Access goal • Bottom line: get everything you can afford

  14. Initiatives to Watch • Dublin Core (for basic metadata elements) • http://purl.org/dc/ • Making of America II (for structural and administrative metadata) • http://sunsite.berkeley.edu/moa2/ • U.S. Library of Congress • http://www.loc.gov/

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