| Developer(s) | Aaron Boxer |
|---|---|
| Initial release | January 1, 2016; 8 years ago (2016-01-01) |
| Stable release | 14.1.0 / December 26, 2024; 1 day ago (2024-12-26) |
| Repository | |
| Written in | C++ |
| Operating system | macOS, Windows, POSIX |
| Platform | x86-64, AArch64 |
| Predecessor | libopenjp2 |
| Available in | English |
| Type | Graphics software |
| License | AGPL v3 |
| Website | github |
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. One of his goals was to close the performance gap with the more efficient but proprietary Kakadu. 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:
- Cantaloupe image server
- IIPSrv image server
- Horos medical image viewer
References
- "Releases · GrokImageCompression/grok". github.com. Retrieved 2024-10-23.
- https://openjpeg.narkive.com/xHDPBR7a/grok-jpeg-2000-discussion-group
- https://encode.su/threads/2477-Grok-JPEG-2000-Codec
- https://chafey.blogspot.com/2016/09/jpeg2000-decoding-performance.html
Further reading
- "JPEG2000 Image Compression Fundamentals, Standards and Practice", by David S. Taubman, Michael W. Marcellin. ISBN 0-7923-7519-X
- Johan van der Knijff (2011). "JPEG 2000 for Long-term Preservation: JP2 as a Preservation Format". D-Lib Magazine. 17 (5/6). doi:10.1045/may2011-vanderknijff.
- Johan van der Knijff (2022). "Generating lossy access JP2s from lossless preservation masters".
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External links
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