Ticket #322 (closed task: fixed)
Opened 2008-10-01T09:00:23-05:00
Last modified 2009-03-20T15:07:24-05:00
Eliminate native library dependencies
| Reported by: | melissa | Owned by: | melissa |
|---|---|---|---|
| Priority: | critical | Milestone: | |
| Component: | bio-formats | Severity: | serious |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: |
Description
Bio-Formats currently depends on two native libraries for reading lossless JPEG and JPEG2000. We need to find a way to support these formats using pure Java. At best, this probably means modifying JAI ImageIO.
Change History
comment:2 Changed 2009-01-06T08:33:00-06:00 by melissa
Eclipse ( http://eclipse.org) contains a pure Java port of libjpeg ( http://ijg.org), which supports lossless JPEG images. We should consider using this existing port, if licensing permits.
comment:3 Changed 2009-02-26T20:08:42-06:00 by melissa
- Milestone bio-formats-4.0.0 deleted
Upon further investigation, the JPEG code in Eclipse SWT does not support lossless JPEGs. I tried several other open-source image libraries (including JMagick, Sanselan, and Helmut Dersch's JPEGDecoder) without any luck.
A brief glance at the specification for lossless JPEG indicates that it would not be too onerous to implement our own decoder - it certainly seems less complex that supporting lossy JPEG. However, this would take some time (a week?), and so is not feasible for the 4.0 release.