Grok (JPEG 2000)
{{Short description|JPEG 2000 image encoder and decoder}}
{{Infobox software
| name = Grok
| logo =
| screenshot =
| caption =
| collapsible =
| author =
| developer = Aaron Boxer
| released = {{Start date and age|2016|01|01}}
| latest release version = 14.3.0
| latest release date = {{Start date and age|2025|01|23}}{{cite web
| url = https://github.com/GrokImageCompression/grok/releases
| title = Releases · GrokImageCompression/grok
| website = github.com
| access-date = 2025-02-13
}}
| programming language = C++
| operating system = macOS, Windows, POSIX
| replaces = libopenjp2
| size =
| language = English
| genre = Graphics software
| license = AGPL v3
| website = {{URL|github.com/GrokImageCompression/grok}}
}}
Grok is a computer software library to encode and decode images in the JPEG 2000 format. It is designed for stability, high performance, and low memory usage. Grok is free and open-source software released under the GNU Affero General Public License (AGPL) version 3.
Grok was forked from OpenJPEG's libopenjp2 in April 2016 by Aaron Boxer under a copyleft license.https://openjpeg.narkive.com/xHDPBR7a/grok-jpeg-2000-discussion-group One of his goals was to close the performance gap with the more efficient but proprietary Kakadu.https://encode.su/threads/2477-Grok-JPEG-2000-Codechttps://chafey.blogspot.com/2016/09/jpeg2000-decoding-performance.html
Grok fully implements the ISO/IEC 15444-1 technical standard. As of 2024, the newer, complexity-reduced High-Throughput JPEG 2000 standard (HTJ2K, ISO/IEC 15444-15, ITU-T T.814) has been implemented, with both encoding and decoding support available.
Features
- support for High-Throughput JPEG 2000 (HTJ2K) encode/decode
- fast random-access sub-image decoding using TLM markers
- full encode/decode support for ICC colour profiles
- full encode/decode support for XML, IPTC, XMP and EXIF meta-data
- full encode/decode support for monochrome, sRGB, palette, YCC, extended YCC, CIELab and CMYK colour spaces
- full encode/decode support for JPEG, PNG, BMP, TIFF, RAW, PNM and PAM image formats
- full encode/decode support for 1–16 bit precision images
- supported platforms: Linux x86-64, Linux AArch64, Windows, macOS and WebAssembly
Integration
Grok has been integrated into a number of other open source projects, including:
- [https://cantaloupe-project.github.io/ Cantaloupe] image server
- [http://iipimage.sourceforge.net/ IIPSrv] image server
- [https://horosproject.org/ Horos] medical image viewer
References
{{Reflist}}
Further reading
- "JPEG2000 Image Compression Fundamentals, Standards and Practice", by David S. Taubman, Michael W. Marcellin. {{ISBN|0-7923-7519-X}}
- {{cite journal|url=http://www.dlib.org/dlib/may11/vanderknijff/05vanderknijff.html|doi=10.1045/may2011-vanderknijff|title=JPEG 2000 for Long-term Preservation: JP2 as a Preservation Format|author= Johan van der Knijff|journal=D-Lib Magazine |year=2011 |volume=17 |issue=5/6 |doi-access=free}}
- {{cite journal|url=https://www.bitsgalore.org/2022/03/30/generating-lossy-access-jp2s-from-lossless-preservation-masters|title=Generating lossy access JP2s from lossless preservation masters|author= Johan van der Knijff|year=2022}}
External links
- {{Official website|github.com/GrokImageCompression/grok}}
- [https://github.com/GrokImageCompression/grok/wiki User guide]
{{Graphics-software-stub}}