# Opacity not working for me

**URL:** <https://discourse.slicer.org/t/opacity-not-working-for-me/4029>\
**Category:** Support\
**Created:** [September 8, 2018, 10:59pm UTC](https://discourse.slicer.org/t/opacity-not-working-for-me/4029 "2018-09-08T22:59:55Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![IMF-Slicer](https://avatars.discourse-cdn.com/v4/letter/i/9de0a6/32.png) [@IMF-Slicer](https://discourse.slicer.org/u/IMF-Slicer)\
**Post date:** [September 8, 2018, 10:59pm UTC](https://discourse.slicer.org/t/opacity-not-working-for-me/4029/1 "2018-09-08T22:59:55Z")

</div>

Operating system: Ubuntu 18.04.1 running in VBox on Windows 10  
Slicer version: 4.8.1  
Expected behavior: Opacity should work  
Actual behavior: Trying to follow the 4 min tutorial. Works well until setting the opacity for skin. Just doesn’t work. As far as I can tell, am following correctly with skin model selected. I don’t see an apply button or anything to actuate the choices.  
Thanks,  
IMF

---

<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 10, 2018, 2:54pm UTC](https://discourse.slicer.org/t/opacity-not-working-for-me/4029/2 "2018-09-10T14:54:46Z")

</div>

You can set the opacity for a model in two ways:

1. Double click the opacity (1.00) in the tree view. Then a slider appears moving which you cahange the opacity
2. Use opacity slider in the 3D Display section  
Neither needs an apply, just moving the slider.