# Paint doesnt work. Just disappears from the region I paint.

**URL:** <https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [August 7, 2025, 6:55pm UTC](https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009 "2025-08-07T18:55:28Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ramya](https://avatars.discourse-cdn.com/v4/letter/r/e9c0ed/32.png) [@Ramya](https://discourse.slicer.org/u/Ramya)\
**Post date:** [August 7, 2025, 6:55pm UTC](https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009/1 "2025-08-07T18:55:28Z")

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Hi I am new to 3D slicer, I am trying to paint on my CT scan to do a segmentation. After I select the region to paint it doesn’t stay. May I know how to fix this issue.

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**Author:** ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)\
**Post date:** [August 7, 2025, 7:02pm UTC](https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009/2 "2025-08-07T19:02:35Z")

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To help you, could you provide a video showing the problem? Also please point out the Slicer version you are using

Thank you

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**Author:** ![Ramya](https://avatars.discourse-cdn.com/v4/letter/r/e9c0ed/32.png) [@Ramya](https://discourse.slicer.org/u/Ramya)\
**Post date:** [August 10, 2025, 3:43pm UTC](https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009/3 "2025-08-10T15:43:39Z")

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thank you I figred out there was some options I missed to select.

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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:** [August 11, 2025, 6:36am UTC](https://discourse.slicer.org/t/paint-doesnt-work-just-disappears-from-the-region-i-paint/44009/4 "2025-08-11T06:36:51Z")

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For future reference, here are the things to check when painting is prevented in a certain area: [Segment editor — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#cannot-paint-outside-some-boundaries)