 The
Library of Congress >> Prints & Photographs
Division >> Prints & Photographs
Online Catalog
>> Harris & Ewing
CSC of Chantilly, Virginia, scanned
the original glass plate negatives using
an overhead capture Sinar 54 digital camera
beginning in 2008. Each negative was scanned
at a resolution of 10,000 pixels on the
long side with the short side scaled in
proportion.
Specifications for the Collection
Uncompressed Archival TIFF Images
| Spatial
Resolution: |
5,000 pixels on the long side with
the short side scaled in proportion
for file names ending in u.tif (17-20
megabytes) |
| Tonal (pixel
depth) resolution: |
8 bits per pixel (grayscale) |
| Image enhancement: |
None. |
| File format: |
Tagged Image File Format (TIFF)
ver. 6.0 |
| Compression: |
None |
Highest Resolution TIFF Images
| Spatial
Resolution: |
10,000 pixels on the long side with
the short side scaled in proportion
(approximately 153 megabytes) |
| Tonal (pixel
depth) resolution: |
16 bits per pixel (grayscale) Note: Some older versions of
image viewers and editing software cannot
handle 16 bit images. |
| 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 (20-100
kilobytes); 1024 pixels on the long
side with the short side scaled in
proportion for file names ending v.jpg (80-210
kilobytes) |
| Tonal (pixel
depth) resolution: |
8 bits per pixel (grayscale) |
| 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 (grayscale) |
| 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 >> Harris & Ewing |