# Joint smooth in 2d

**URL:** <https://discourse.slicer.org/t/joint-smooth-in-2d/44369>\
**Category:** Support\
**Created:** [September 5, 2025, 9:06pm UTC](https://discourse.slicer.org/t/joint-smooth-in-2d/44369 "2025-09-05T21:06:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sulli419](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sulli419/32/78859_2.png) [@sulli419](https://discourse.slicer.org/u/sulli419)\
**Post date:** [September 5, 2025, 9:06pm UTC](https://discourse.slicer.org/t/joint-smooth-in-2d/44369/1 "2025-09-05T21:06:22Z")

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Hi,

The joint smoothening tool historically works very well for me, but now I have a series of atlas segments that are very poorly sampled in Z. The X Y edges are also rather rough, and so I want to improve these by upsampling the segmentations and then joint smoothen. I know how to do this part, and it has worked well in the past with higher Z sampled images, but now the abrupt jumps in Z make the joint smoothen tool do odd things. Is there a simple set of commands to run this tool in 2D, i.e., in each plane of Z?

p.s., One hack I did was to inflate the volume with replicate images (e.g, z x 10), which improved the outcome, but this seems like waste of resources and it still misbehaved for this odd use case.

Thanks,  
Steve