# Marking points on images

**URL:** <https://discourse.slicer.org/t/marking-points-on-images/18610>\
**Category:** Development\
**Tags:** segmentation\
**Created:** [July 10, 2021, 7:00am UTC](https://discourse.slicer.org/t/marking-points-on-images/18610 "2021-07-10T07:00:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anitakh1](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anitakh1/32/3350_2.png) [@anitakh1](https://discourse.slicer.org/u/anitakh1)\
**Post date:** [July 10, 2021, 7:00am UTC](https://discourse.slicer.org/t/marking-points-on-images/18610/1 "2021-07-10T07:00:15Z")

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Sir, how to i mark 0s and 1s as point coordinates in different colors in an image using 3D slicer?

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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:** [July 12, 2021, 4:17am UTC](https://discourse.slicer.org/t/marking-points-on-images/18610/2 "2021-07-12T04:17:03Z")

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You can access the volume as a numpy array as shown [here](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#modify-voxels-in-a-volume) and modify the voxels by changing values in this array.