| Use | Resolution | Bit Depth |
Color Space |
Dimen- sions |
Editing/ Processing |
File Format/ Compression | Storage | |
|---|---|---|---|---|---|---|---|---|
Archival |
Long-term archive |
35mm=2700+ ppi1 120mm=? ppi 8x10 in.=400 ppi |
24-bit |
RGB |
At least 4,000 pixels on LS. 2 |
Check grayscale and color accuracy |
TIFF, with little endian (IBM PC) Byte Order; no compression; save with embedded ICC Color Profile |
Stored on 2 media: CD, DVD, tape, spinning disk |
Working |
To create derivatives. Publication printing. |
300 dpi |
sRGB |
-Change file format.3 -Converted to sRGB -Tone & color adjusted -Sharpened |
Same as AM, but may be compressed with LZW compression if saving storage space is essential 4 |
If kept, same as AM. |
||
Static |
Internet delivery |
150 dpi |
600 pix. on LS (no zoom); |
-Reduced dimensions -Sharpened |
JPEG, medium quality, 5-7; or high quality, 8-10 (of 10) |
Spinning disk and backup tape |
Do not scan the slide mount - just the film.
[1] - Scanning a 35 mm. slide or negative at 2700 ppi is equivalent to scanning at 300 ppi and increasing the size of the image by 900%. This yields an image with about 6000 pixels on the LS. For smaller slides, increase the scanning resolution if necessary to achieve at least 4,000 pixels on the long side - 6,000 would be even better.
[2] - Negatives and slides that are larger than 35 mm. should be scanned in the same way as 35 mm. negatives and slides, but have a dimension of 6,000 pixels on the long side.
[3] - If you are using Photoshop to edit the Working Master, change the file's TIFF format to PSD, Photoshop's native file format, which allows for more editing functionality.
[4] - To provide zoom and pan functionality for an image, you can upload the Working Master (TIFF) file to a "full resolution" CONTENTdm collection. CONTENTdm will then convert the TIFF format to a JPEG2000 format.