# Exporting png-files as stacks after registration

**URL:** <https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587>\
**Category:** Support\
**Tags:** registration\
**Created:** [May 25, 2022, 3:40pm UTC](https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587 "2022-05-25T15:40:39Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![j.v.d](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@j.v.d](https://discourse.slicer.org/u/j.v.d)\
**Post date:** [May 25, 2022, 3:40pm UTC](https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587/1 "2022-05-25T15:40:39Z")

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Hey everyone!  
Lately I wanted to align two different CT-modalities with 3D Slicer so that corresponding anatomic structures are positioned exactly over each other. This worked out quite well so far with “Transforms” and “General Registration (BRAINS)” and now I wanted to create stacks (png for example) of these two CT-modalities with exact this orientation.  
I tried to accomplish that with the “Screen Capture”- Utility but so far I only got single pictures instead of a whole stack which I could use for further analysis. Is it possible to create these stacks I´m looking for ?

Best regards  
Jan

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [May 25, 2022, 3:53pm UTC](https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587/2 "2022-05-25T15:53:01Z")

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Why do you want to export stacks? YOu will loose coordinate systems, voxel spacing and possibly degrade your data.

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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:** [May 25, 2022, 5:57pm UTC](https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587/3 "2022-05-25T17:57:18Z")

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> [@j.v.d](#):
>
> I tried to accomplish that with the “Screen Capture”- Utility but so far I only got single pictures instead of a whole stack which I could use for further analysis.

Screen capture module can export image stacks (use slice sweep mode), but image stacks are for presentation purposes only, due to the issues that @muratmaga mentioned above.

For further analysis, use 3D file formats, such as nrrd.

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**Author:** ![j.v.d](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@j.v.d](https://discourse.slicer.org/u/j.v.d)\
**Post date:** [June 9, 2022, 10:19am UTC](https://discourse.slicer.org/t/exporting-png-files-as-stacks-after-registration/23587/4 "2022-06-09T10:19:18Z")

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Thank you both for your advices ! Regarding what @muratmaga mentioned I should rather use the single pictures instead.