Grok (JPEG 2000)

Grok
Developer(s)	Aaron Boxer
Initial release	January 1, 2016
Stable release	7.6.0 / August 16, 2020
Repository	github.com/GrokImageCompression/grok;
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.com/GrokImageCompression/grok

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.

Features

1. High performance - currently around 1/2 speed of Kakadu demo decoder

1. Fast sub-tile decode

2. Supports output to stdout for certain file formats

3. Supports TLM code stream marker for fast single-tile and sub-tile decoding of large tiled images

4. Supports PLT code stream marker for fast sub-tile decoding of large single-tile images

5. Full support for ICC profiles and other meta-data such as XML, IPTC and XMP

6. Supports new Part 15 of the standard, aka High Throughput JPEG 2000, which promises up to 10x speed up over current Part 1.

Grok has been integrated into a number of other open source projects, including the IIPSrv image server,and the Horos medical image viewer.

gollark: Are you insulting my code by calling it bees?!

gollark: Technically, they're length-prefixed but by zstandard.

gollark: Admittedly, it could probably be stored in the footer and that would work fine.

gollark: It only works because zstandard happens to somehow store said compressed length.

gollark: The best bit is how it doesn't actually know the compressed length of things because that would be annoying to implement.