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Digitizing the Collection |
CSC of Chantilly, Virginia, scanned the slides, transparencies and negatives using an overhead capture Sinar 54 digital camera beginning in 2008. Each was scanned at a resolution of approximately 5,000 pixels on the long side with the short side scaled in proportion.
Specifications for the Collection
Uncompressed Archival TIFF Images
| Spatial Resolution: | A minimum of 5,000 pixels on the long side with the short side scaled in proportion for file names ending in u.tif (20-160 megabytes; average size: 50 mb.) |
| Tonal (pixel depth) resolution: | 8 bits per pixel grayscale or 24 bits per pixel for color materials |
| Image enhancement: | None. |
| File format: | Tagged Image File Format (TIFF) ver. 6.0 |
| Compression: | None |
Compressed Service Images
| Spatial resolution: | 640 pixels on the long side with the short side scaled in proportion for file names ending r.jpg (15-100 kilobytes); 1024 pixels on the long side with the short side scaled in proportion for file names ending v.jpg (50-210 kilobytes) |
| Tonal (pixel depth) resolution: | 8 bits per pixel |
| Image enhancement: | Mild sharpening |
| File format: | JPEG |
| Compression: | Compressed to yield an average compression ratio of 10:1 |
Thumbnail Images
| Spatial Resolution: | 150 pixels on the long side with the short side scaled in proportion for file names ending in t.gif (approximately 10 kilobytes) |
| Tonal (pixel depth) resolution: | 8 bits per pixel |
| Image enhancement: | Mild sharpening |
| File format: | Archived copy: TIFF - Tagged Image
File Format Online copy: GIF - Graphics Interchange Format |
| Compression: | Archived copy: Uncompressed Online copy: Compression native to the GIF format |
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The
Library of Congress >> Prints & Photographs
Division >> Prints & Photographs
Online Catalog >> Korab Collection