# Latest

**URL:** https://discourse.itk.org/latest.md

[Latest](https://discourse.itk.org/latest.md) · [Categories](https://discourse.itk.org/categories.md) · [Tags](https://discourse.itk.org/tags.md)

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## [Getting started with Discourse](https://discourse.itk.org/t/getting-started-with-discourse/22)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 20\
**Last updated:** [September 25, 2017, 9:37pm UTC](https://discourse.itk.org/t/getting-started-with-discourse/22 "2017-09-25T21:37:56Z")

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To receive updates about new software releases and major events, sign-in with email, GitHub, or Google. After logging in, a new question can be posted by selecting a category and clicking on \[NewTopic\] button found in t…

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## [Welcome to the ITK discussion forum!](https://discourse.itk.org/t/welcome-to-the-itk-discussion-forum/8)

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**Author:** [@system](https://discourse.itk.org/u/system)\
**Replies:** 0\
**Last updated:** [September 12, 2017, 11:29pm UTC](https://discourse.itk.org/t/welcome-to-the-itk-discussion-forum/8 "2017-09-12T23:29:26Z")

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Welcome to the ITK discussion forum! The Insight Toolkit (ITK) is an open-source, cross-platform library for multidimensional image analysis. This forum is a place to discuss image analysis with ITK. This includes the p…

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## [unable to build static libs](https://discourse.itk.org/t/unable-to-build-static-libs/7788)

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**Author:** [@jsemeda](https://discourse.itk.org/u/jsemeda)\
**Replies:** 5\
**Last updated:** [September 10, 2026, 7:14pm UTC](https://discourse.itk.org/t/unable-to-build-static-libs/7788 "2026-09-10T19:14:45Z")

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when building SITK using superbuild on windows10-64 I keep ending up with dynamic libs no matter what I do. I tried editing all cmakelists files to set shared libs to 0 but that did not do anuting. I added a line in the …

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## [Best approach for analyzing microscope images with ITK?](https://discourse.itk.org/t/best-approach-for-analyzing-microscope-images-with-itk/7799)

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**Author:** [@Alexia\_Fison](https://discourse.itk.org/u/Alexia_Fison)\
**Replies:** 2\
**Last updated:** [September 9, 2026, 1:03pm UTC](https://discourse.itk.org/t/best-approach-for-analyzing-microscope-images-with-itk/7799 "2026-09-09T13:03:59Z")

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I’m working with microscopy images from lab equipment and want to process/analyze them using ITK. What filters or techniques would you recommend for tasks like cell counting, image segmentation, or noise reduction? Any g…

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## [Basic questions before contributing](https://discourse.itk.org/t/basic-questions-before-contributing/7797)

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**Author:** [@Toddthegod1](https://discourse.itk.org/u/Toddthegod1)\
**Replies:** 1\
**Last updated:** [September 9, 2026, 12:54pm UTC](https://discourse.itk.org/t/basic-questions-before-contributing/7797 "2026-09-09T12:54:25Z")

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Hi ITK, I am a senior in college in a course where we have to contribute as a team with other students to an open-source project. Is there anything appropriate I should know before we start to contribute to the project?…

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## [ITK Training Course in October 2026](https://discourse.itk.org/t/itk-training-course-in-october-2026/7796)

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**Author:** [@seb\_goll](https://discourse.itk.org/u/seb_goll)\
**Replies:** 0\
**Last updated:** [September 8, 2026, 3:32pm UTC](https://discourse.itk.org/t/itk-training-course-in-october-2026/7796 "2026-09-08T15:32:18Z")

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Dear all, Kitware will be holding an online/onsite ITK training course for developers on October 5th 2026 in Lyon, France and online (Paris time, CEST). This course will cover the following features of ITK : Overview…

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## [Writing large multiframe DICOM files via GDCM in ITK](https://discourse.itk.org/t/writing-large-multiframe-dicom-files-via-gdcm-in-itk/7426)

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**Author:** [@darrent1974](https://discourse.itk.org/u/darrent1974)\
**Replies:** 8\
**Last updated:** [September 4, 2026, 3:30am UTC](https://discourse.itk.org/t/writing-large-multiframe-dicom-files-via-gdcm-in-itk/7426 "2026-09-04T03:30:30Z")

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Hi, I was hoping to use GDCMImageIO to write large to very large image volumes (~10 -1000GB) as single file, mutiframe DICOM files. I specifically want to avoid writing these images as a set of individual 2D slice files…

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## [Updating Slicer's ITK to v6?](https://discourse.itk.org/t/updating-slicers-itk-to-v6/7758)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 8\
**Last updated:** [August 22, 2026, 11:55pm UTC](https://discourse.itk.org/t/updating-slicers-itk-to-v6/7758 "2026-08-22T23:55:37Z")

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Has anyone started this? I am willing to give it try, but I want to avoid duplication of effort. My main motivation is adding .vti support to Slicer, which was recently added to ITK via PR 6032. Tagging people who might…

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## [Could ITK drop ITK\_USE\_64BITS\_IDS and just do SizeValueType = std::size\_t?](https://discourse.itk.org/t/could-itk-drop-itk-use-64bits-ids-and-just-do-sizevaluetype-std-size-t/2053)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 8\
**Last updated:** [August 21, 2026, 11:47am UTC](https://discourse.itk.org/t/could-itk-drop-itk-use-64bits-ids-and-just-do-sizevaluetype-std-size-t/2053 "2026-08-21T11:47:47Z")

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It appears quite hard to fully support 64-bit memory address space (including images of more than 4 GB), in ITK source code. On many places, it appears that a 64-bit “size” or offset value is converted to 32-bit (dependi…

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## [Proposal: Aliases of \`itk.D\`, \`itk.US\`, \`itk.SLL\`, ... for specific sizes of numeric types](https://discourse.itk.org/t/proposal-aliases-of-itk-d-itk-us-itk-sll-for-specific-sizes-of-numeric-types/7792)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 1\
**Last updated:** [August 19, 2026, 2:42pm UTC](https://discourse.itk.org/t/proposal-aliases-of-itk-d-itk-us-itk-sll-for-specific-sizes-of-numeric-types/7792 "2026-08-19T14:42:26Z")

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The ITK Python package allows specifying the pixel type of an image by passing an itkCType object, for example itk.D for the C type double, itk.US for unsigned short and itk.SLL for signed long long. As in itk.Image\[itk…

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## [Should ITK offer a supported way to read DICOM tags and sequences? (four downstreams have vendored itk::DCMTKFileReader)](https://discourse.itk.org/t/should-itk-offer-a-supported-way-to-read-dicom-tags-and-sequences-four-downstreams-have-vendored-itk-dcmtkfilereader/7791)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 3\
**Last updated:** [August 18, 2026, 7:47pm UTC](https://discourse.itk.org/t/should-itk-offer-a-supported-way-to-read-dicom-tags-and-sequences-four-downstreams-have-vendored-itk-dcmtkfilereader/7791 "2026-08-18T19:47:38Z")

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While fixing a Windows link failure in BRAINSTools, I found the same vendored copy of itk::DCMTKFileReader in four independent projects, all of them in namespace itk with ITK’s original class names. Three are actively m…

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## [ITK 5.4.7 has been released! Expanded Image IO, Faster DTI, and Reliable Builds](https://discourse.itk.org/t/itk-5-4-7-has-been-released-expanded-image-io-faster-dti-and-reliable-builds/7787)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [August 10, 2026, 7:07pm UTC](https://discourse.itk.org/t/itk-5-4-7-has-been-released-expanded-image-io-faster-dti-and-reliable-builds/7787 "2026-08-10T19:07:47Z")

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We are pleased to announce the release of ITK 5.4.7! ITK 5.4.7 is a maintenance release focused on image IO capabilities, computational performance, build reliability, and packaging resilience for this cross-platform, o…

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## [Patches for ITK 5.4.7](https://discourse.itk.org/t/patches-for-itk-5-4-7/7780)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 7\
**Last updated:** [July 24, 2026, 1:26pm UTC](https://discourse.itk.org/t/patches-for-itk-5-4-7/7780 "2026-07-24T13:26:32Z")

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Hi folks, The next patch (bugfix) release, ITK 5.4.7, is coming up. Patches currently staged on the Git release-5.4 branch include: Andras Lasso (1): BUG: Fix image file reader crash when axis direction vector i…

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## [Different BSpline fixed-parameters for equal-sized images?](https://discourse.itk.org/t/different-bspline-fixed-parameters-for-equal-sized-images/7768)

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**Author:** [@reox](https://discourse.itk.org/u/reox)\
**Replies:** 6\
**Last updated:** [June 9, 2026, 6:51am UTC](https://discourse.itk.org/t/different-bspline-fixed-parameters-for-equal-sized-images/7768 "2026-06-09T06:51:07Z")

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I started with a very simple registration pipeline, basically like this: import itk fixed\_image = itk.imread('fixed.mhd', itk.F) moving\_image = itk.imread('moving.mhd', itk.F) fixed\_mask = itk.imread("fixed\_mask.mhd",…

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## [NRRD module settings hidden in cmake?](https://discourse.itk.org/t/nrrd-module-settings-hidden-in-cmake/7770)

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**Author:** [@seanm](https://discourse.itk.org/u/seanm)\
**Replies:** 1\
**Last updated:** [June 5, 2026, 8:22pm UTC](https://discourse.itk.org/t/nrrd-module-settings-hidden-in-cmake/7770 "2026-06-05T20:22:09Z")

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Hi all, Normally when I want to enable an ITK module, I go in ccmake (or CMake.app), turn on advanced mode, and search for the module name. I tried this just now searching for NRRD and found nothing. Is that expected? T…

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## [~8x slower registration with itk-elastix Python API vs elastix CLI — minimal reproducible example](https://discourse.itk.org/t/8x-slower-registration-with-itk-elastix-python-api-vs-elastix-cli-minimal-reproducible-example/7736)

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**Author:** [@NicoKiaru](https://discourse.itk.org/u/NicoKiaru)\
**Replies:** 39\
**Last updated:** [June 5, 2026, 7:14pm UTC](https://discourse.itk.org/t/8x-slower-registration-with-itk-elastix-python-api-vs-elastix-cli-minimal-reproducible-example/7736 "2026-06-05T19:14:41Z")

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Disclaimer: this is a \[crosspost from image.sc\]( ~8x slower registration with itk-elastix Python API vs elastix CLI — minimal reproducible example - Usage & Issues - Image.sc Forum ) Hi all, I’m integrating itk-elastix…

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## [itkpng issue](https://discourse.itk.org/t/itkpng-issue/7769)

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**Author:** [@Rosie](https://discourse.itk.org/u/Rosie)\
**Replies:** 0\
**Last updated:** [June 3, 2026, 10:46am UTC](https://discourse.itk.org/t/itkpng-issue/7769 "2026-06-03T10:46:57Z")

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Compilation error occurred when I try to use the itkpng: include\\ITK-5.4\\itkpng/png.h(329,13): fatal error C1083: Cannot open include file: ‘pnglibconf.h’: No such file or directory There is indeed no pnglibconf.h fi…

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## [ITK build with TBB](https://discourse.itk.org/t/itk-build-with-tbb/1954)

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**Author:** [@nm97](https://discourse.itk.org/u/nm97)\
**Replies:** 23\
**Last updated:** [May 22, 2026, 2:10pm UTC](https://discourse.itk.org/t/itk-build-with-tbb/1954 "2026-05-22T14:10:30Z")

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Hi everyone, I am trying to build ITK-5.0.0 with TBB. I have already successfully built TBB. After cmake config I get this error Could not find a package configuration file provided by "TBB" with any of the follow…

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## [Registation of two vascular images using Python Simple ITK](https://discourse.itk.org/t/registation-of-two-vascular-images-using-python-simple-itk/7766)

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**Author:** [@anatolejimenez](https://discourse.itk.org/u/anatolejimenez)\
**Replies:** 1\
**Last updated:** [May 22, 2026, 12:51pm UTC](https://discourse.itk.org/t/registation-of-two-vascular-images-using-python-simple-itk/7766 "2026-05-22T12:51:09Z")

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Hi, I would like to register two vascular images of the same modality but with different dynamics. I played a lot with the image registration metrics (correlation, mutual information and correlation) with optimizer grad…

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## [SimpleITK 3.0.0 Beta 1](https://discourse.itk.org/t/simpleitk-3-0-0-beta-1/7767)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 0\
**Last updated:** [May 22, 2026, 12:45pm UTC](https://discourse.itk.org/t/simpleitk-3-0-0-beta-1/7767 "2026-05-22T12:45:41Z")

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Announcing the SimpleITK 3.0.0b1 Beta Release! This beta release is a major milestone for SimpleITK 3.0, featuring new functionality and improvements including experimental integration of SimpleElastix into the binary d…

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## [SimpleITK 2.5.5 Release](https://discourse.itk.org/t/simpleitk-2-5-5-release/7765)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 0\
**Last updated:** [May 14, 2026, 6:10pm UTC](https://discourse.itk.org/t/simpleitk-2-5-5-release/7765 "2026-05-14T18:10:51Z")

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Announcing the SimpleITK 2.5.5 Release! Release Highlights SimpleITK in R on the Windows operating system is available! SimpleITK 2.5.5 is the first official release to support building SimpleITK with R wrapping for a…

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## [Proposal: Hard-fork vnl inside ITK and end upstream-vxl tracking](https://discourse.itk.org/t/proposal-hard-fork-vnl-inside-itk-and-end-upstream-vxl-tracking/7761)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 2\
**Last updated:** [May 10, 2026, 10:36pm UTC](https://discourse.itk.org/t/proposal-hard-fork-vnl-inside-itk-and-end-upstream-vxl-tracking/7761 "2026-05-10T22:36:48Z")

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TL;DR ITK’s use of vxl is narrow, concentrated, and already well past the point where co-maintaining a synced copy with vxl/vxl upstream provides reciprocal value. I’m proposing we: Deprecate and then remove ITK\_USE\_…

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## [Eigen's role in ITK](https://discourse.itk.org/t/eigens-role-in-itk/7760)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 1\
**Last updated:** [May 10, 2026, 6:18pm UTC](https://discourse.itk.org/t/eigens-role-in-itk/7760 "2026-05-10T18:18:49Z")

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There is an ongoing discussion about Eigen’s role in ITK, its current use, future use, and updating-related problems. Feel free to pitch in, at this GitHub issue.

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## [Proposal: drop ITKAnalyzeObjectMap remote module from ITK](https://discourse.itk.org/t/proposal-drop-itkanalyzeobjectmap-remote-module-from-itk/7757)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 0\
**Last updated:** [May 4, 2026, 8:32pm UTC](https://discourse.itk.org/t/proposal-drop-itkanalyzeobjectmap-remote-module-from-itk/7757 "2026-05-04T20:32:24Z")

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The ITK maintainers are proposing to drop the AnalyzeObjectLabelMap remote module from the ITK source tree. PR #6207 removes the Modules/Remote/AnalyzeObjectLabelMap.remote.cmake declaration so the module will no longe…

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## [Patches for ITK 5.4.6](https://discourse.itk.org/t/patches-for-itk-5-4-6/7745)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 19\
**Last updated:** [May 4, 2026, 4:33pm UTC](https://discourse.itk.org/t/patches-for-itk-5-4-6/7745 "2026-05-04T16:33:41Z")

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Hi folks, The next patch (bugfix) release, ITK 5.4.6, is coming up. Patches currently staged on the Git release-5.4 branch include: Bradley Lowekamp (1): BUG: Fix GDCM posix\_memalign undefined with mingw Dženan…

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## [ITK 5.4.6 has been released! Performance, Stability, and Security](https://discourse.itk.org/t/itk-5-4-6-has-been-released-performance-stability-and-security/7756)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [May 1, 2026, 8:41pm UTC](https://discourse.itk.org/t/itk-5-4-6-has-been-released-performance-stability-and-security/7756 "2026-05-01T20:41:18Z")

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We are pleased to announce the release of ITK 5.4.6! ITK 5.4.6 is a maintenance release focused on performance improvements, security fixes, and platform compatibility for this cross-platform, open-source toolkit suppor…

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## [How to compile the linux target without symlinks?](https://discourse.itk.org/t/how-to-compile-the-linux-target-without-symlinks/7755)

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**Author:** [@Rosie](https://discourse.itk.org/u/Rosie)\
**Replies:** 1\
**Last updated:** [April 28, 2026, 10:05am UTC](https://discourse.itk.org/t/how-to-compile-the-linux-target-without-symlinks/7755 "2026-04-28T10:05:02Z")

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Dear developers, I would like to compile the linux target of ITK 5.4 by Cmake. It will create symlink binaries (.so and .so.1) which are not supported by windows system. So I wonder if it can be compiled without symlink…

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## [Is ITK vulnerable to gdcm CVE-2026-3650 memory consumption issue?](https://discourse.itk.org/t/is-itk-vulnerable-to-gdcm-cve-2026-3650-memory-consumption-issue/7748)

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**Author:** [@dclunie](https://discourse.itk.org/u/dclunie)\
**Replies:** 4\
**Last updated:** [April 16, 2026, 8:13pm UTC](https://discourse.itk.org/t/is-itk-vulnerable-to-gdcm-cve-2026-3650-memory-consumption-issue/7748 "2026-04-16T20:13:34Z")

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https://www.cve.org/CVERecord?id=CVE-2026-3650

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## [Reorganize RemoteModules for reduced maintenance burden](https://discourse.itk.org/t/reorganize-remotemodules-for-reduced-maintenance-burden/7753)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 3\
**Last updated:** [April 16, 2026, 12:51am UTC](https://discourse.itk.org/t/reorganize-remotemodules-for-reduced-maintenance-burden/7753 "2026-04-16T00:51:16Z")

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RFC: Consolidating remote modules into hierarchical category repos Tracking issue: ENH: Consolidate remote modules into hierarchical category repos · Issue #6060 · InsightSoftwareConsortium/ITK · GitHub ITK currently ma…

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## [AI generated pull requests overwhelming, hard to review carefully](https://discourse.itk.org/t/ai-generated-pull-requests-overwhelming-hard-to-review-carefully/7728)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 16\
**Last updated:** [April 14, 2026, 5:20pm UTC](https://discourse.itk.org/t/ai-generated-pull-requests-overwhelming-hard-to-review-carefully/7728 "2026-04-14T17:20:16Z")

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The current stream of AI generated (or AI aided) pull requests is a bit overwhelming to me. It is hard for me to review them carefully. In general, I try to avoid reviewing any pull request that proposes changing thousa…

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