Hamilton College Digital Collections


Table: Specifications for Digitizing Oversize Objects
Use Resolution Bit Depth Color Space Dimen-
sions
Editing/
Processing
File Format/ Compression Storage

Archival
Master
(AM)

Long-term archive

300+ ppi
(in pieces if nec.)1

24-bit

RGB

Varies by size of original (no less than 6000 pixels on LS)

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
Master
(WM)

To create derivatives.

Publ cation printing.

sRBG

-Change file format2

-Tone & color adjusted

-(Converted to grayscale if b&w)

-Sharpened

Same as AM, but may be compressed with LZW compression if saving storage space is essential.3

If kept, same as AM.

Dynamic Delivery File

Internet delivery

300 ppi.

24-bit
(b&w: 8-bit or 1-bit)

varies

None

JPEG2000

CONTENTdm server

 

[1] - ppi is dependent on map size. If the map is scanned in sections and stitched together, the resulting file ma be too large for your photo editing software to manage. In this case the sections will have to be downsampled to a more management ppi size.

[2] - 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.

[3] - To provide zoom and pan functionality for an imago, 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)