Needs release notes:

• Added three new channel operations #4230
• Support for different charset encodings in PcfFontFile #3907 <- PR Add release notes for #3907 PcfFontFile charset encodings #4502
• ImageGrab.grab() for Linux with XCB #4260
• Add APNG support #4243

Release Checklist

Main Release

Released quarterly on January 2nd, April 1st, July 1st and October 15th.

• Open a release ticket e.g. Release Pillow 5.2.0 on July 1, 2018 #3154
• Develop and prepare release in master branch.
• Check Travis CI and AppVeyor CI to confirm passing tests in master branch.
• Check that all of the wheel builds Pillow Wheel Builder pass the tests in Travis CI.
• In compliance with PEP 440, update version identifier in src/PIL/_version.py
• Update CHANGES.rst.
• Run pre-release check via make release-test in a freshly cloned repo.
• Create branch and tag for release e.g.:

  git branch 5.2.x
  git tag 5.2.0
  git push --all
  git push --tags

• Create source distributions e.g.:

  make sdist

• Create binary distributions
• Upload all binaries and source distributions e.g. twine upload dist/Pillow-5.2.0*
• Create a new release on GitHub
• In compliance with PEP 440, increment and append .dev0 to version identifier in src/PIL/_version.py

Binary Distributions

Windows

• Contact @cgohlke for Windows binaries via release ticket e.g. Release 2.9.0 on July 1, 2015 #1174.
• Download and extract tarball from @cgohlke and twine upload *.

Mac and Linux

• Use the Pillow Wheel Builder:

  git clone https://github.com/python-pillow/pillow-wheels
  cd pillow-wheels
  ./update-pillow-tag.sh [[release tag]]

• Download distributions from the Pillow Wheel Builder container.

  wget -m -A 'Pillow-<VERSION>-*' \
  http://a365fff413fe338398b6-1c8a9b3114517dc5fe17b7c3f8c63a43.r19.cf2.rackcdn.com

Publicize Release

• Announce release availability via Twitter e.g. https://twitter.com/PythonPillow/status/1013789184354603010

Documentation

• Make sure the default version for Read the Docs is up-to-date with the release changes