OpenJPEG

{{Infobox software

| name = OpenJPEG

| author = Hervé Drolon, François-Olivier Devaux, Antonin Descampe, Yannick Verschueren, David Janssens, Benoît Macq

| developer =

| released = {{start date|2005|12|15}}{{cite web |url=http://www.openjpeg.org/index.php?menu=news |title=OpenJPEG library : an open source JPEG 2000 codec |accessdate=2011-01-12}}

| latest release version = {{wikidata|property|preferred|references|edit|P348|P548=Q2804309}} | latest release date = {{Start date and age|{{wikidata|qualifier|preferred|single|P348|P548=Q2804309|P577}}|df=yes}}

| programming language = C

| operating system = Mac OS X, Windows, POSIX

| platform =

| size =

| language =

| genre = graphic software

| license = BSD

| website = {{url|www.openjpeg.org}}

}}

OpenJPEG is an open-source library to encode and decode JPEG 2000 images. As of version 2.1 released in April 2014, it is officially conformant with the JPEG 2000 Part-1 standard.{{Cite web |url=http://openjpeg.googlecode.com/svn/tags/version.2.1/NEWS |title=Archived copy |access-date=2014-09-07 |archive-date=2014-09-07 |archive-url=https://web.archive.org/web/20140907191156/http://openjpeg.googlecode.com/svn/tags/version.2.1/NEWS |url-status=dead }} It was subsequently adopted by ImageMagick instead of JasPer in 6.8.8-2{{Cite web|url=https://imagemagick.org/discourse-server/viewtopic.php?p=114432#p114432|title = OpenJP2 delegate on 6.8.9 - ImageMagick}} and approved as new reference software for this standard in July 2015.{{cite web |url=http://www.openjpeg.org/2015/07/09/openjpeg-officially-reference-software/ |title=OpenJPEG is officially a JPEG 2000 reference software |website=www.openjpeg.org |url-status=dead |archive-url=https://web.archive.org/web/20150808202707/http://www.openjpeg.org/2015/07/09/openjpeg-officially-reference-software |archive-date=2015-08-08}} OpenJPEG is a fork of libj2k, a JPEG-2000 codec library written by David Janssens during his master thesis at University of Louvain (UCLouvain) in 2001.

In April 2016 Grok was forked from libopenjp2 by Aaron Boxer under the more restrictive AGPL.https://openjpeg.narkive.com/xHDPBR7a/grok-jpeg-2000-discussion-group He was aiming to close up to the performance of the much more efficient proprietary Kakadu library.https://encode.su/threads/2477-Grok-JPEG-2000-Codec

Unlike JasPer,{{cite newsgroup|message-id=kAUwe.47790$fp6.35688@twister.nyroc.rr.com|newsgroup=comp.protocols.dicom|title=Re: [Dcmlib] jpeg 2000|author=Mathieu Malaterre|date=30 Jun 2005 }} another open-source JPEG 2000 implementation, OpenJPEG fully respects the JPEG 2000 specification and can compress and decompress lossless 16-bit images.{{citation needed|date=October 2012}}{{Original research inline|date=March 2023}}