mozjpeg-lossless-optimization 0.9.0

Optimize JPEGs losslessly using MozJPEG

This library optimizes JPEGs losslessly using MozJPEG.

To reduce the file sizes,

• the Huffman table of the JPEGs is optimized,

• the baseline JPEGs are converted to progressive JPEGs,

• and any metadata and ICC profiles are removed.

The JPEGs optimized with this library are identical to what you get using the jpegtran tool from MozJPEG with the -optimize, -progressive and -copy none options.

Usage

import mozjpeg_lossless_optimization

with open("./image.jpg", "rb") as input_jpeg_file:
    input_jpeg_bytes = input_jpeg_file.read()

output_jpeg_bytes = mozjpeg_lossless_optimization.optimize(input_jpeg_bytes)

with open("./out.jpg", "wb") as output_jpeg_file:
    output_jpeg_file.write(output_jpeg_bytes)

Install

From Sources

To install MozJPEG Lossless Optimization, MozJPEG will be compiled, so you will need a C compilator and cmake. On Debian / Ubuntu you can install everything you need with the following command:

sudo apt install build-essential cmake python3 python3-dev python3-pip python3-setuptools

Once everything installed, clone this repository:

git clone https://github.com/wanadev/mozjpeg-lossless-optimization.git

Then navigate to the project’s folder:

cd mozjpeg-lossless-optimization

Retrieve submodules:

git submodule init
git submodule update

And finally build and install using the following command (as root on Linux):

python3 setup.py install

Hacking

Get the source and build C lib and module:

# Install system dependencies
sudo apt install build-essential cmake python3 python3-dev python3-pip python3-setuptools

# Get the sources
git clone https://github.com/wanadev/mozjpeg-lossless-optimization.git
cd mozjpeg-lossless-optimization
git submodule init
git submodule update

# Create and activate a Python virtualenv
python3 -m venv __env__
source __env__/bin/activate

# Install Python dependencies in the virtualenv
pip install cffi

# Build MozJPEG
# This will generate files in ./mozjpeg/build/ folder
python setup.py build

# Build the CFFI module "in-place"
# This will create the ./mozjpeg_lossless_optimization/_mozjpeg_opti.*.so file on Linux
python ./mozjpeg_lossless_optimization/mozjpeg_opti_build.py

Lint:

pip install nox
nox -s lint

Licenses

MozJPEG Lossless Optimization is licensed under the BSD 3 Clause license. See the LICENSE file for more information.

MozJPEG is covered by three compatible BSD-style open source licenses. See its license file for more information.

Changelog

• v0.9.0: First public release