jpeglib

jpeglib is a Python package, envelope for the popular C library libjpeg for handling JPEG files.

Currently almost all of the popular Python image libraries use libjpeg under the hood, however do not expose the whole spectrum of parameters that libjpeg offers. At the same time it is usually also impossible to load a low-level JPEG components - DCT coefficients and quantization tables. All of this is possible with jpeglib.

Getting the DCT coefficients with jpeglib is as simple as

>>> import jpeglib
>>> im = jpeglib.read_dct("input.jpeg")
>>> im.Y; im.Cb; im.Cr; im.qt

With jpeglib you can choose a particular version of libjpeg to work with. Currently supported are all libjpeg versions from 6b to 9e, and newest major and minor releases of libjpeg-turbo and mozjpeg.

>>> jpeglib.version.set('6b')
>>> im = jpeglib.read_spatial("input.jpeg")
>>> im.spatial

Note

This project is under active development.

Contents

• Usage
  • Installation and setup
  • Spatial domain
  • DCT coefficients
• Reference
  • Working with jpegs
  • Manage libjpeg version
• Glossary
  • JPEG compression
  • libjpeg C library
  • Progressive JPEG
  • Glossary terms
• Frequently asked questions