Guidelines for Derived JPEG 2000 Images

Summary:
FCLA's XPAT Image Class middleware (v.11) supports compressed images in the JP2 format for PALMM Visual Collections. JPEG 2000 is a new standard for still image compression from the JPEG committee. No single method of processing is recommended, but Kakadu, ImageMagick, or Adobe® Photoshop® CS (Photoshop 8.0) software currently allow JP2 processing.

Specifications:

File Format:

JPEG 2000 (Joint Photographic Expert Group)
Specification: ISO/IEC 15444-1
Reference: http://www.jpeg.org/jpeg2000/

Compression:

Minimum (highest image quality),
Range from 10% to 15% (image quality not less than 85% of source file)

Bit-depth:

Same as source file

DPI:

Same as source file

Image Dimensions: Same as source file
File Header: Append structured information about the derivation process as appropriate to the SUSDL XML Metadata DTD (forthcoming)
A structured information template will be added in a future revision of these Guidelines

Process:
No single method of processing is recommended. However, the following Instructions provide one example using Adobe® Photoshop® CS (Photoshop 8.0).

Quality control:
A visual inspection together with a query of the file header should be completed by spot check.  Spot check requires inspection of every image in thumbnail view and of no less than 10% of the images in full-image view. A variety of factors effecting on-screen and print legibility should be examined.  For additional guidance, we  recommend reading Cornell University's Digital Imaging Tutorial: Quality Control.