Imaging Standards
The following tables aggregate standards based for digital preservation based on consortial requirements and based on the work of national governance bodies and interest groups.
- Printed and handwritten text
- Printed photographs
- Large format maps and posters
- Negatives and transparencies
- Books
- Newspapers
- Microfilm
- Microfiche
Scan Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Black and white print | 1-bit | 600 | Bitonal | 1:1 | TIFF with Group 4 lossless compression AND PDF/A |
Black and white + illustrations, or handwritten | 8-bit | 400 | Grayscale | 1:1 | Uncompressed TIFF AND PDF/A |
Text with color images, or handwritten | 24-bit | 400 | RGB | 1:1 | Uncompressed TIFF AND PDF/A |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Black and white | 8-bit | 600 | Grayscale | 1:1 | Uncompressed Tiff |
Color | 24-bit | 600 | RGB | 1:1 | Uncompressed TIFF |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Black and white | 1-bit | 5000 - 10,000 pixels on the longest side | Bitonal | 1:1 | Uncompressed TIFF |
Grayscale | 8-bit | 5000 - 10,000 pixels on the longest side | Grayscale | 1:1 | Uncompressed TIFF |
Color | 24-bit | 5000 - 10,000 pixels on the longest side | RGB | 1:1 | Uncompressed TIFF |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Black and white | 8-bit | 5000 pixels on the longest side* | Grayscale | 1:1 | Uncompressed TIFF |
Color | 24-bit | 5000 pixels on the longest side* | RGB | 1:1 | Uncompressed TIFF |
*Common film sizes and corresponding resolutions to achieve 5000 pixels on the longest side.
Film Size | Scanner Resolution |
---|---|
35 mm | 4000 dpi |
2x3 in | 2400 dpi |
6x9 cm | 2400 dpi |
6x7 cm | 2400 dpi |
6x6 cm | 2400 dpi |
7x9 cm | 2400 dpi |
4x4 cm | 4000 dpi |
4x5 in | 1200 dpi |
8x10 in | 1200 dpi |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Black and white | 1-bit | 600 | Bitonal | 1:1 | Uncompressed TIFF |
Grayscale | 8-bit | 400 | Grayscale | 1:1 | Uncompressed Tiff |
Color | 24-bit | 400 | RGB | 1:1 | Uncompressed TIFF |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Original | 24-bit | 400 | RGB | 1:1 | Uncompressed TIFF |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
16mm | 8-bit | 400 | Grayscale | 1:1 | Uncompressed TIFF |
35mm | 8-bit | 400 | RGB | 1:1 | Uncompressed TIFF |
Type | Bit Depth | Resolution (ppi/dpi) | Color space | Scale | File format |
---|---|---|---|---|---|
Microfiche | 8-bit | 400 | Grayscale | 1:1 | Uncompressed TIFF |