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README.md

JPEG XL reference implementation

JXL logo

This repository contains a reference implementation of JPEG XL (encoder and decoder), called libjxl.

JPEG XL is in the final stages of standardization and its codestream format is frozen.

The libraries API, command line options and tools in this repository are subject to change, however files encoded with cjxl conform to the JPEG XL format specification and can be decoded with current and future djxl decoders or libjxl decoding library.

Quick start guide

For more details and other workflows see the "Advanced guide" below.

Checking out the code

git clone https://github.com/libjxl/libjxl.git --recursive

This repository uses git submodules to handle some third party dependencies under third_party/, that's why is important to pass --recursive. If you didn't check out with --recursive, or any submodule has changed, run: git submodule update --init --recursive.

Important: If you downloaded a zip file or tarball from the web interface you won't get the needed submodules and the code will not compile. You can download these external dependencies from source running ./deps.sh. The git workflow described above is recommended instead.

Installing dependencies

Required dependencies for compiling the code, in a Debian/Ubuntu based distribution run:

sudo apt install cmake pkg-config libbrotli-dev

Optional dependencies for supporting other formats in the cjxl/djxl tools, in a Debian/Ubuntu based distribution run:

sudo apt install libgif-dev libjpeg-dev libopenexr-dev libpng-dev libwebp-dev

We recommend using a recent Clang compiler (version 7 or newer), for that install clang and set CC and CXX variables. For example, with clang-7:

sudo apt install clang-7
export CC=clang-7 CXX=clang++-7

Building

cd libjxl
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF ..
cmake --build . -- -j$(nproc)

The encoder/decoder tools will be available in the build/tools directory.

Installing

sudo cmake --install .

Basic encoder/decoder

To encode a source image to JPEG XL with default settings:

build/tools/cjxl input.png output.jxl

For more settings run build/tools/cjxl --help or for a full list of options run build/tools/cjxl -v -v --help.

To decode a JPEG XL file run:

build/tools/djxl input.jxl output.png

When possible cjxl/djxl are able to read/write the following image formats: .exr, .gif, .jpeg/.jpg, .pfm, .pgm/.ppm, .pgx, .png.

Benchmarking

For speed benchmarks on single images in single or multi-threaded decoding djxl can print decoding speed information. See djxl --help for details on the decoding options and note that the output image is optional for benchmarking purposes.

For more comprehensive benchmarking options, see the benchmarking guide.

Advanced guide

Building with Docker

We build a common environment based on Debian/Ubuntu using Docker. Other systems may have different combinations of versions and dependencies that have not been tested and may not work. For those cases we recommend using the Docker environment as explained in the step by step guide.

Building JPEG XL for developers

For experienced developers, we also provide build instructions for an up to date Debian-based Linux and 64-bit Windows. If you encounter any difficulties, please use Docker instead.

License

This software is available under a 3-clause BSD license which can be found in the LICENSE file, with an "Additional IP Rights Grant" as outlined in the PATENTS file.

Please note that the PATENTS file only mentions Google since Google is the legal entity receiving the Contributor License Agreements (CLA) from all contributors to the JPEG XL Project, including the initial main contributors to the JPEG XL format: Cloudinary and Google.

Additional documentation

Codec description

Development process

Contact

If you encounter a bug or other issue with the software, please open an Issue here.

There is a subreddit about JPEG XL, and informal chatting with developers and early adopters of libjxl can be done on the JPEG XL Discord server.

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