OpenJPEG is an open-source JPEG 2000 codec written in C language. It has been developed in order to promote the use of JPEG 2000, a still-image compression standard from the Joint Photographic Experts Group (JPEG). Since April 2015, it is officially recognized by ISO/IEC and ITU-T as a JPEG 2000 Reference Software.
Anyone. As the OpenJPEG code is released under the [BSD 2-clause “Simplified” License][link-license], anyone can use or modify the code, even for commercial applications. The only restriction is to retain the copyright in the sources or in the binaries documentation. Of course, if you modified the code in a way that might be of interest for other users, you are encouraged to share it (through a github pull request or by filling an issue) but this is not a requirement.
The library is developed and maintained by the Image and Signal Processing Group (ISPGroup), in the Université catholique de Louvain (UCL, with the support of the CNES, the CS company and the intoPIX company. The JPWL module has been developed by the Digital Signal Processing Lab (DSPLab) of the University of Perugia, Italy (UNIPG).
See [LICENSE][link-license] for license and copyright information.
See INSTALL for installation procedures.
See NEWS for user visible changes in successive releases.
An API/ABI timeline is automatically updated [here][link-api-timeline].
OpenJPEG strives to provide a stable API/ABI for your applications. As such it only exposes a limited subset of its functions. It uses a mechanism of exporting/hiding functions. If you are unsure which functions you can use in your applications, you should compile OpenJPEG using something similar to gcc:
-fvisibility=hidden compilation flag. See also: http://gcc.gnu.org/wiki/Visibility
On windows, MSVC directly supports export/hiding function and as such the only API available is the one supported by OpenJPEG.
[badge-license]: https://img.shields.io/badge/license-BSD--2--Clause-blue.svg “BSD 2-clause “Simplified” License” [link-license]: https://github.com/uclouvain/openjpeg/blob/master/LICENSE “BSD 2-clause “Simplified” License” [badge-build]: https://travis-ci.org/uclouvain/openjpeg.svg?branch=master “Build Status” [link-build]: https://travis-ci.org/uclouvain/openjpeg “Build Status” [badge-msvc-build]: https://ci.appveyor.com/api/projects/status/github/uclouvain/openjpeg?branch=master&svg=true “Windows Build Status” [link-msvc-build]: https://ci.appveyor.com/project/detonin/openjpeg/branch/master “Windows Build Status” [badge-coverity]: https://scan.coverity.com/projects/6383/badge.svg “Coverity Scan Build Status” [link-coverity]: https://scan.coverity.com/projects/uclouvain-openjpeg “Coverity Scan Build Status” [link-api-timeline]: http://www.openjpeg.org/abi-check/timeline/openjpeg “OpenJPEG API/ABI timeline”