# Question on using Mask volume

**URL:** <https://discourse.slicer.org/t/question-on-using-mask-volume/11662>\
**Category:** Support\
**Created:** [May 22, 2020, 2:56am UTC](https://discourse.slicer.org/t/question-on-using-mask-volume/11662 "2020-05-22T02:56:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Deepa](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/deepa/32/5634_2.png) [@Deepa](https://discourse.slicer.org/u/Deepa)\
**Post date:** [May 22, 2020, 2:56am UTC](https://discourse.slicer.org/t/question-on-using-mask-volume/11662/1 "2020-05-22T02:56:08Z")

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Continuing the discussion from [Extracting a subnetwork from 3D volume](https://discourse.slicer.org/t/extracting-a-subnetwork-from-3d-volume/11570/4):

To retain only green and exclude red from a volume like below  
 ![Untitled](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/1/3154fdfcd338545332d2d16034bb60d9d1d2c6db.png)

I’m using the Mask volume option.

 ![Untitled](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/1/41914e19c4e44aee03c2ecb31de8e57fbbc15fdb.png)

I’ve selected the segment (e.g. segment\_3, see below) \> Mask Volume and used the default  
options provided to create a new volume.

However, I couldn’t see only green in new volume( renamed: 10umvolume) after I click `Apply`.

I’m not sure if I should be changing the default options (e.g. Editable area) to display only green in the new volume that will be created after using `Mask Volume`.

Any suggestions?

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<div class="post-metadata">

**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 22, 2020, 3:15am UTC](https://discourse.slicer.org/t/question-on-using-mask-volume/11662/2 "2020-05-22T03:15:20Z")

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MaskVOlume just creates a new volume with the masked region only. It doesn’t turn off what’s being displayed on the 3D rendering window, nor automatically switch to masked volume. You will need to do that.

Turn off the visibility of existing segments/segmentations, go to volume rendering, find the masked volume recently created, and hit the eye icon next to it.