# How to change contrast

**URL:** https://discourse.slicer.org/t/how-to-change-contrast/19673
**Category:** Support
**Created:** [September 14, 2021, 6:52pm UTC](https://discourse.slicer.org/t/how-to-change-contrast/19673 "2021-09-14T18:52:07Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![alyssan](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@alyssan](https://discourse.slicer.org/u/alyssan)
#### Post date: [September 14, 2021, 6:52pm UTC](https://discourse.slicer.org/t/how-to-change-contrast/19673/1 "2021-09-14T18:52:07Z")

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Hello,  
How can I change the contrast on my ct images?

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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: [September 14, 2021, 7:57pm UTC](https://discourse.slicer.org/t/how-to-change-contrast/19673/2 "2021-09-14T19:57:22Z")

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This section of the user manual should help: [https://slicer.readthedocs.io/en/latest/user\_guide/user\_interface.html#adjusting-image-window-level](https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#adjusting-image-window-level)