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PALMM Guidelines for Digitizing Derived JPEG2000 Images
KBA-01635-G6K0
Purpose & Scope
JPEG2000 (JP2) is an increasingly well supported standard for still image compression from the JPEG committee. It is recommended for service copies of both printed and visual materials (preferred over JPEG).
Procedure

JPEG2000 images can be derived from TIFF masters automatically by DigiTool as an Ingest Task. However, this means that the TIFFs must be loaded into DigiTool as well, which may not be desirable. Libraries can create their own JP2 derivatives using software such as Kakadu, Photoshop, Aware and Jakarta. If so, the following specifications are recommended.

 

Specifications:

e Format:

JPEG 2000
Specification: ISO/IEC 15444-1
Reference: http://www.jpeg.org/jpeg2000/

Encoding:

6.0 (ITU T.6) 
Specification: TIFF 6.0 Specification(PDF file version)

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

Scale/Image Dimensions:

Same as source file



Process:

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

  1. Launch Adobe Photoshop CS
  2. Open the TIFF image you with to compress into a JPEG2000.
  3. Select ‘Save As…’ from the ‘File’ Menu
  4. Under format, change format to JPEG2000.
  5. The default extension for JPEG2000 format in Adobe is ‘.jpf’.

This should be changed to ‘.jp2’.

  1. Click ‘Save’. This will bring up the JPEG2000 window.
  2. Confirm the following settings:

 

* Include Metadata should be checked.

* Include Color Settings should be checked

* JP2 Compatible should be checked and greyed out.

* Quality should be set to the standard (10% to 15%).

  1. Click on Advanced Options to confirm additional settings:

* XMP should be unchecked unless data is being saved with the FileInfo

feature of Photoshop

* EXIF should be checked

* Wavelet Filter should be Float

* Tile Size should be set to 1024 x 1024.

* ICC Profile should be included.

  1. Once all settings are confirmed, click OK on the JPEG2000 window to create the file.

It is recommended that this process be automated by creating an Action and running a batch against a folder or collection of folders, or by using an application which employs scripting.

 

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 Digital Imaging Tutorial: Quality Control.

Additional Documentation
Environment