ITK 5.4.2 has been released!

We are pleased to announce the release of ITK 5.4.2, the latest maintenance update for this cross-platform, open-source toolkit supporting N-dimensional scientific image analysis with spatially-aware algorithms.    This patch release addresses several key issues identified since ITK 5.4.0 while maintaining API stability.

 Highlights

As a maintenance update following 5.4.0, version 5.4.2 incorporates critical improvements including:

• Enhanced Label Map Handling: Improved unique label map filter behavior for segmentation workflows
• Modern Library Support: Updated compatibility with recent libtiff versions
• Large Data Optimization: Expanded VectorImage support for high-dimensional datasets
• Performance Improvements: Fixed thread-based parallelism in SLIC filter implementations
• Cross-Platform Enhancements: Build system updates and compiler compatibility fixes

A full list of changes can be found in the changelog below.

 Versioning Note

This release follows 5.4.0 directly, as the intermediate 5.4.1 patch was reserved for an urgent hotfix that required immediate distribution prior to full release documentation.

For comprehensive details on ITK 5.4.0, please review the ITK 5.4.0 Release Notes.

 Download

Python Packages

Install ITK Python packages with:

pip install itk

Guide and Textbook

• InsightSoftwareGuide-Book1-5.4.2.pdf
• InsightSoftwareGuide-Book2-5.4.2.pdf

Library Sources

• InsightToolkit-5.4.2.tar.gz
• InsightToolkit-5.4.2.zip

Testing Data

Unpack optional testing data in the same directory where the Library Source is unpacked.

• InsightData-5.4.2.tar.gz
• InsightData-5.4.2.zip

Checksums and Signatures

• InsightToolkit-5.4.2.tar.gz.asc
• InsightToolkit-5.4.2.zip.asc
• InsightData-5.4.2.tar.gz.asc
• InsightData-5.4.2.zip.asc
• MD5SUMS
• SHA512SUMS

 Congratulations

Congratulations and thank you to everyone who contributed to this release.

 What’s Next

ITK 6 Preparation

The development community is currently focused on delivering ITK 6, a major modernization release featuring:

• Architectural upgrades for contemporary C++ development
• Enhanced template metaprogramming capabilities
• Streamlined build system configurations

Early access builds (alpha/beta releases) will become available during ongoing 5.4.x maintenance, enabling parallel evaluation of new features while maintaining production stability.

5.4 Maintenance Commitment

We remain dedicated to supporting current users through:

• Regular security and regression patches
• Critical bug resolution
• Platform compatibility updates

Enjoy ITK!