README.md

World's Leading Open Source JPEG 2000 Codec

Features

• support for new High Throughput JPEG 2000 (HTJ2K) standard
• fast random-access sub-image decoding using TLM and PLT 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

Performance

Below is a benchmark comparing time and memory performance for Grok 9.7.8 and Kakadu 8.05 on the following workflows:

1. decompress large single-tiled image of Mars to TIF output
2. decompress region (1000,1000,5000,5000) from large single-tiled image of Mars to TIF output
3. decompress 6 resolutions from 580000x825000 single-tiled image of Luxembourg
4. decompress 7 resolutions from 580000x825000 single-tiled image of Luxembourg
5. decompress 8 resolutions from 580000x825000 single-tiled image of Luxembourg
6. decompress region (574200,816750,580000,825000) from 580000x825000 single-tiled image of Luxembourg

Benchmark Details

• test system : 24 core / 48 thread AMD Threadripper running Fedora 36 with 5.17 Linux kernel and xfs file system
• codecs were configured to use all 48 threads
• file cache was cleared before each decompression using $ sudo sysctl vm.drop_caches=3
• Grok was built in release mode using GCC 10

Results

Test	Grok	Kakadu
1	13.74 s / 16.6 GB	9.02 s / 0.05 GB
2	0.25 s / 0.4 GB	0.12 s
3	0.37 s / 0.7 GB	2.72 s / 1.0 GB
4	0.67 s / 1.0 GB	3.02 s / 1.0 GB
5	1.76 s / 1.8 GB	3.72 s / 1.1 GB
6	2.89 s / 6.0 GB	7.39 s / 1.1 GB

Library Details

• INSTALL
• WIKI
• LICENSE

Current Build Status