Grok (JPEG 2000)
# 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.

## 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
