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Best Practices for Digital Imaging and Metadata

Learn how to capture and manage digital images effectively with proper formats and metadata. Understand the importance of descriptive, administrative, and structural metadata for preservation and access. Follow best practices for image capture, formats, and metadata creation.

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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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