The Djatoka JPEG 2000 Image Server is a plug-in image server that images can be sent to for processing. It can function with an installation of Apache Tomcat as a web app. Islandora uses Djatoka to prepare TIFF images for viewing, particularly with the Internet Archive Bookreader
Djatoka can be downloaded from the project's Sourceforge page at http://sourceforge.net/apps/mediawiki/djatoka/index.php?title=Installation.
Detailed instructions for installation and configuration can be found in Chapter 10 - Installing Solution Pack & Tool Dependencies, under the section 'Djatoka'.