SimpleITK 2.1 Release Candidate 2


Announcing the SimpleITK 2.1 Release Candidate 2!

Users and developers are encouraged to test the RC before the final release and report issues, bugs, and any compatibility problems. This is the final RC before the final the 2.1.0 release.

Installing SimpleITK

Complete instructions on getting started with SimpleITK including downloading binaries or building SimpleITK can be found on the SimpleITK Read the Docs web page.

Python Binary Downloads

  • Python binary wheels are available for download. It is important to have the latest version of pip for correct wheel compatibility and installation. To install the latest SimpleITK package from GitHub releases:
python -m pip install --upgrade pip
python -m pip install --pre SimpleITK --find-links

Python Wheels for Apple ARM64

Binary Python Wheels for Apple ARM64 have been manually created and are available

Anaconda Binary Downloads

Conda packages are available from Anaconda Cloud on the SimpleITK channel. These can be installed with:

conda install -c simpleitk/label/dev simpleitk

Release Notes

New Features

  • Add ImageRegistrationMethod::StopRegistration method
  • Add StopRegistration method to Demons based registration filters
  • Update HistogramMatchingImageFilter to use named “referenceImage” input for second input image.

Bug Fixes

  • R calls to nonexistent methods are now handled gracefully
  • In BinaryMagnitudeImageFilter test, changed type from UInt32 to Int32 for defined C++ behavior, fixed Mac ARM testing failure.



  • Fix comparison between signed and unsigned integer compiler warning
  • Remove explicit instantiating of Image of deque of LabelObjectLine
  • Update SWIG to 4 require in CMake find_package

Any and all feedback on the new Mac ARM Python wheels would be greatly appreciated.