Explore IllinoisIllinois Digital Archives |
|
JESSE WHITE
Illinois Secretary of State and State Librarian |
Illinois Digital Archives
Guidelines for Images
| MEDIA | SCAN FORMAT | MASTER IMAGE | ACCESS IMAGE | THUMBNAIL IMAGE |
| Printed text |
Usually 1-bit (bitonal) |
TIFF Uncompressed Resolution: 600 ppi |
JPEG Medium quality compression Resolution: 300 ppi Resize images to 1024 (length) x 768 (width) pixels |
GIF GIF compression Resolution: 72 ppi Resize images to 150-200 pixels (+/-) across long dimension |
| Handwritten text | 8-bit grayscale or 24-bit color |
TIFF Uncompressed Resolution: 300 ppi (grayscale) |
JPEG Medium quality compression Resolution: 300 ppi Resize images to 1024 x 768 pixels |
GIF GIF compression Resolution: 72 ppi Resize images to 150-200 pixels (+/-) across long dimension |
| B/W photograph | 8-bit grayscale or 24-bit color |
TIFF Uncompressed Resolution: 300 ppi |
JPEG Medium quality compression Resolution: 150 ppi Resize images to 1024 x 768 pixels |
GIF GIF compression Resolution: 72 ppi Resize images to 150-200 pixels (+/-) across long dimension |
|
Color photograph Color slide B/W slide Map Illustration Manuscript etc. |
24-bit color |
TIFF Uncompressed Resolution: 300 ppi |
JPEG Medium quality compression Resolution: 300 ppi Resize images to 1024 x 768 pixels |
GIF GIF compression Resolution: 72 ppi Resize images to 150-200 pixels (+/-) across long dimension |
| 3-D artifact | 24-bit color |
TIFF Uncompressed Resolution: 300 ppi |
JPEG Medium quality compression Resolution: 300 ppi Resize images to 1024 x 768 pixels |
GIF GIF compression Resolution: 72 ppi Resize images to 150-200 pixels (+/-) across long dimension |