# Threshold picking up too many voxels. How do I segment different areas with same voxels without having to manually paint it? 

**URL:** <https://discourse.slicer.org/t/threshold-picking-up-too-many-voxels-how-do-i-segment-different-areas-with-same-voxels-without-having-to-manually-paint-it/11476>\
**Category:** Support\
**Tags:** segmentation, threshold\
**Created:** [May 9, 2020, 7:42am UTC](https://discourse.slicer.org/t/threshold-picking-up-too-many-voxels-how-do-i-segment-different-areas-with-same-voxels-without-having-to-manually-paint-it/11476 "2020-05-09T07:42:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Demi\_Trimino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/demi_trimino/32/7806_2.png) [@Demi\_Trimino](https://discourse.slicer.org/u/Demi_Trimino)\
**Post date:** [May 9, 2020, 7:42am UTC](https://discourse.slicer.org/t/threshold-picking-up-too-many-voxels-how-do-i-segment-different-areas-with-same-voxels-without-having-to-manually-paint-it/11476/1 "2020-05-09T07:42:05Z")

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Operating system: Mac  
Slicer version: 4-11-0  
Expected behavior:  
Actual behavior:

 ![Screen Shot 2020-05-08 at 11.35.40 AM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/5/05bb0674b0e4e2bae4a5068e1c5dbaaf5eeef556.png)  
I want to just segment the outline (cuticle) but the inner muscles are too similar in intensity and threshold keeps picking them up. How do I segment this without have to manually paint it on each z stack?

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [May 10, 2020, 11:35am UTC](https://discourse.slicer.org/t/threshold-picking-up-too-many-voxels-how-do-i-segment-different-areas-with-same-voxels-without-having-to-manually-paint-it/11476/2 "2020-05-10T11:35:42Z")

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you can segment with the Islands after threshold.