# Changing image spacing of image segmentations
**URL:** https://discourse.slicer.org/t/changing-image-spacing-of-image-segmentations/42385
**Category:** Support
**Tags:** segmentation
**Created:** [March 31, 2025, 6:13pm UTC](https://discourse.slicer.org/t/changing-image-spacing-of-image-segmentations/42385 "2025-03-31T18:13:22Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jps](https://discourse.slicer.org/u/jps)
#### Post date: [March 31, 2025, 6:13pm UTC](https://discourse.slicer.org/t/changing-image-spacing-of-image-segmentations/42385/1 "2025-03-31T18:13:22Z")
Hello!
I mistakenly began segmenting on volumes without specifying the correct image spacing. Currently they are set to 1 mm and I learned how to change them to 0.002 mm by editing the volume properties.
How do I apply this to my segmentations? I have messed around with the specify geometry option with little success. Thank you!
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### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [March 31, 2025, 6:29pm UTC](https://discourse.slicer.org/t/changing-image-spacing-of-image-segmentations/42385/2 "2025-03-31T18:29:51Z")
Probably easiest is to export to labelmap, change the spacing, and then re-convert to segmentation.
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [March 31, 2025, 8:15pm UTC](https://discourse.slicer.org/t/changing-image-spacing-of-image-segmentations/42385/3 "2025-03-31T20:15:34Z")
You can also apply and harden a scaling transform (linear transform with scaling factors in the first 3 values of the diagonal) to both your image and the segmentation.
Or, save the segmentation as .nhdr file and edit the spacing in the header using a text editor. The .nrrd file is not suitable for modification in a text editor, because it also contains binary data, which is often corrupted by text editors.