In order to create the best-quality digital surrogates for library materials, we use the following practices when photographing objects and processing images.
Technical Metadata
Text-only Items - Theses, Dissertations, General Stacks
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Access Files
- 400 DPI
- 3000 pixels on long edge
- sRGB
- 8 bit
- Exclude target item level target (beginning/end of volume)
- Crop just inside page edge
- Create Optimized Character Recognition (OCR) PDF after Quality Control
Preservation Files
- 600 DPI
- Fixed pixel array
- Adobe RGB
- 16 bit
- Include target item level target (beginning/end of volume)
- Crop just inside page edge
Rare Books, Manuscripts, and Archival Items
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Access Files
- 400 DPI
- 3000 pixels on long edge
- sRGB
- 8 bit
- Exclude item and page level targets
- Crop outside page edge 1/8 to 1/4 inches
- Include appropriate production note and blank as first two files in each item
Preservation Files
- 600 DPI
- Fixed pixel array
- Adobe RGB
- 16 bit
- Include item and page level targets
- Crop outside page edge 1/8 to 1/4 inches
- Include appropriate production note and blank as first two files in each item
Large Scale Items - Maps, Posters, Blueprints
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Access Files
- 400 DPI
- 4000 pixels on long edge
- sRGB
- 8 bit
- Exclude item and page level targets
- Crop outside page edge 1/8 to 1/4 inches
Preservation Files
- 600 DPI
- Fixed pixel array
- Adobe RGB
- 16 bit
- Include target item level target
- Crop outside page edge 1/8 to 1/4 inches