Grok (JPEG 2000)
In computer software, Grok is a library to encode and decode images in the JPEG 2000 format. It fully implements Part 1 of the ISO/IEC 15444-1 technical standard. 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.
| Developer(s) | Aaron Boxer |
|---|---|
| Initial release | January 1, 2016 |
| Stable release | 7.6.0
/ August 16, 2020 |
| Repository |  |
| Written in | C++ |
| Operating system | macOS, Windows, POSIX |
| Platform | IA-32, x86-64, ARM-64 |
| Available in | English |
| Type | Graphics software |
| License | AGPL v3 |
| Website | github |
Features
- High performance - grk_decompress is currently over 1/2 the speed of Kakadu, one of the leading commercial JPEG 2000 libraries
- Fast sub-tile decode
- Supports decoding to stdout for png, jpeg, bmp, pnm, and raw output formats
- Supports TLM code stream marker for fast single-tile and sub-tile decoding of large tiled images
- Supports PLT code stream marker for fast sub-tile decoding of large single-tile images
- Full support for ICC profiles and other meta-data such as XML, IPTC and XMP
- Supports new Part 15 of the standard, aka High Throughput JPEG 2000, which promises up to a 10x speed up over the original Part 1 of the JPEG 2000 standard
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
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. "JPEG 2000 for Long-term Preservation: JP2 as a Preservation Format". doi:10.1045/may2011-vanderknijff. Cite journal requires
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External links
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