Hamilton College Digital Collections


Table: Digitizing Manuscript Materials - Recommended Specification
Use Resolution Bit Depth Color Space Dimen-
sions
Editing/
Processing
File Format/ Compression Storage

Archival
Master
(AM)

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
Master (WM)

To create derivatives.

Publication printing.

sRGB

-Change file format.[1]

-Saved as sRGB

-Tone & color adjusted

-Sharpened

Same as AM2

If kept, same as AM.

Static
Delivery
File
(JPEG)

Internet delivery (multiple files)

Set dimens.
instead

No less than 640 pixels wide

-Reduced dimensions
-(Converted to grayscale/bitonal if b&w.)

-Sharpened

JPEG, medium quality, 5-7; or high quality, 8-10 (of 10)

Spinning disk and backup tape

Compound
Delivery
File
(JPEG)

Continuous reading (one file)

Set dimens.
instead

?

?

Make continuous

PDF or PDF/A with minimal compression; OCR'd

Trans-
cription

Keyword searching

N/A

N/A

N/A

N/A

Transcribe text manually;
[TEI encoded]

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. [See Submitting Full Resolution Images.]

(Updated: May 6, 2008; December 17, 2010 pjm)