# Nrrd vs nii regarding affine data and transforms

**URL:** <https://discourse.slicer.org/t/nrrd-vs-nii-regarding-affine-data-and-transforms/1896>\
**Category:** Support\
**Tags:** transforms, nrrd\
**Created:** [January 22, 2018, 2:05pm UTC](https://discourse.slicer.org/t/nrrd-vs-nii-regarding-affine-data-and-transforms/1896 "2018-01-22T14:05:07Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [February 25, 2020, 4:13am UTC](https://discourse.slicer.org/t/nrrd-vs-nii-regarding-affine-data-and-transforms/1896/17 "2020-02-25T04:13:08Z")

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This silent orthogonalization of image axes in the image writer should be probably fixed in ITK. I’ve asked about this on the ITK forum: [https://discourse.itk.org/t/saving-non-orthogonal-volume-in-nifti-format/2760](https://discourse.itk.org/t/saving-non-orthogonal-volume-in-nifti-format/2760).

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