LANL Releases Open Source JPEG2000 Image Server

The lead article in the September/October issue of D-Lib Magazine release yesterday is on djatoka, the open source JPEG2000 Image Server from Los Alamos National Laboratory. The authors, Ryan Chute and Herbert Van de Sompel describe their effort in the article abstract:

The ISO-standardized JPEG 2000 image format has started to attract significant attention. Support for the format is emerging in major consumer applications, and the cultural heritage community seriously considers it a viable format for digital preservation. So far, only commercial image servers with JPEG 2000 support have been available. They come with significant license fees and typically provide the customers with limited extensibility capabilities. Here, we introduce djatoka, an open source JPEG 2000 image server with an attractive basic feature set, and extensibility under control of the community of implementers. We describe djatoka, and point at demonstrations that feature digitized images of marvelous historical manuscripts from the collections of the British Library and the University of Ghent. We also call upon the community to engage in further development of djatoka.

Truly Lossless JPEG2000 Compression

This posting used to have the tag “– Except for Grayscale?” appended to the end of the title. That is no longer needed; see the bottom of the post for an explanation. We have been implementing University of Michigan’s DLXS software, and DLXS uses JPEG2000 for its image masters. We have been investigating reports of perceived changes in images in the conversion from our old media server to DLXS, and along the way I discovered an important fact: the default parameters for two popular JPEG2000 codecs results in an irreversible transformation. Here is how to address that.

Following Up on Adobe Photoshop and JPEG2000

The discussion has died down on Jack Nack’s blog posting about the future of JPEG2000 support in Photoshop. Since I last updated my own commentary on the issue, there have been a few more comments, including one by Erich Kesse from the University of Florida. Jack has added a few follow-ups to comments left on his blog, including this one at the bottom of Erich’s comment:

[Thanks for the detailed feedback. I would note that regardless of what Adobe does with JPEG 2000, other developers can create JPEG 2000 reading/writing plug-ins for the app. --J.]

GSoC: JPEG2000 JPIP Server and Viewer Applet

OhioLINK was excited and privileged to participate in the second annual Google Summer of Code — a program to inspire young developers and provide students in Computer Science and related fields the opportunity to do work related to their academic pursuits during the summer, and to support existing open source projects and organizations. This is the first of three posts summarizing the efforts of three students; this one details the work of Juan Pablo Garcia Ortiz, a Ph.D. candidate at the University of Almeria in Spain, to build a JPEG2000 JPIP Streaming Server and Client Browser Viewer Applet. This is an edited version of his final report.