| Use | Resolution | Bit Depth | Color Space | Dimen- sions |
Editing/ Processing |
File Format/ Compression | Storage | |
|---|---|---|---|---|---|---|---|---|
Archival |
Long-term archive |
600 ppi |
24-bit |
RGB |
Varies (100% of original; no less than 4,000 pixels on LS) |
None |
TIFF, with little endian (IBM PC) Byte Order; no compression; with embedded ICC Color Profile |
Stored on 2 media: CD, DVD, tape, spinning disk |
Working |
To create derivatives. Publication printing. |
sRGB |
-Change file format.[1] -Saved as sRGB -Tone & color adjusted -Sharpened |
If kept, same as AM. |
||||
Static |
Internet delivery (multiple files) |
Set dimens. |
-Reduced dimensions -Sharpened |
JPEG, medium quality, 5-7; or high quality, 8-10 (of 10) |
Spinning disk and backup tape |
|||
Compound |
Continuous reading (one file) |
Set dimens. |
? |
? |
Make continuous |
PDF or PDF/A with minimal compression; OCR'd |
||
Trans- |
Keyword searching |
N/A |
N/A |
N/A |
N/A |
Transcribe text manually; |
UTF-8; TXT (or XML if encoded) |
[1] 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.
[2] 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.