Image Standards
Images - Bitmap/Raster
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Capture: Access Quality |
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Type of Original |
Bit depth |
Resolution |
Compression |
File Format |
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Books (text pages) |
Bitonal (4-bit black and white) |
400 ppi |
CCITT Group 4 Fax Compression |
TIFF |
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Books (illustrations or figures) |
8-bit (grayscale) or 24-bit (color) |
400 ppi |
Uncompressed |
TIFF |
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Slides (35mm) |
24-bit (color) |
300ppi @ 900% (2700ppi) |
Uncompressed |
TIFF |
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Oversized items (large books, maps, etc.) |
24-bit (color) |
400 ppi |
Uncompressed |
TIFF |
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Project Specific (dictated by desired use) |
1-bit, 8-bit, or 24-bit, as appropriate |
Resolution should ensure a minimum capture size of 3000 pixels on long side |
Uncompressed |
TIFF |
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Capture: Preservation Quality |
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Type of Original |
Bit depth |
Resolution |
Compression |
File Format |
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Books (text pages) |
24-bit (color) |
600 ppi
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Uncompressed |
TIFF |
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Books (illustrations or figures) |
8-bit (grayscale) or 24-bit (color) |
600 ppi |
Uncompressed |
TIFF |
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Slides (35mm) |
24-bit (color) |
600ppi @ 900% (5400ppi) |
Uncompressed |
TIFF |
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Oversized items (large books, maps, etc.) |
24-bit (color) |
400 ppi |
Uncompressed |
TIFF |
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Deliverables |
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Purpose |
Resolution |
Compression |
File Format |
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Thumbnail |
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120 pixels on the longest side |
JPEG is automatically compressed, select High or level 10 compression |
JPEG |
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Screen-sized |
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1024 x 768 pixels; or 650-850 pixel width with proportional height (as appropriate) for page images |
As above |
JPEG |
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Maximum (create only as needed) |
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3000 pixels on the longest side |
As above |
JPEG |
Illustrations/Graphs/Charts - Vector
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Creation |
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Purpose |
Format |
Compression |
Bit depth |
Resolution |
Comments |
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Master copy |
EPS, SVG, proprietary formats, e.g. Adobe Illustrator |
NA |
NA |
NA |
Include color reference whenever appropriate and feasible |
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Deliverables |
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Purpose |
Format |
Compression |
Bit depth |
Resolution |
Comments |
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Deliverable |
EPS,SVG, SWF, JPEG |
NA |
24-bit color, 8-bit grayscale |
Appropriate for display of necessary information; 300 ppi if readable printing must be supported |
Vector images may be retained in their original format or converted to bitmap/raster formats for delivery; use the chart above as a reference. |
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Thumbnail |
JPEG |
JPEG is automatically compressed, select High or level 10 compression |
24-bit color; 8-bit grayscale 120 pixels on the longest side |
72 ppi |
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