# Images are not being displayed but are loaded as value changes when mouse is moved.

**URL:** <https://discourse.slicer.org/t/images-are-not-being-displayed-but-are-loaded-as-value-changes-when-mouse-is-moved/5384>\
**Category:** Support\
**Created:** [January 15, 2019, 9:46pm UTC](https://discourse.slicer.org/t/images-are-not-being-displayed-but-are-loaded-as-value-changes-when-mouse-is-moved/5384 "2019-01-15T21:46:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lucy\_Upchurch](https://avatars.discourse-cdn.com/v4/letter/l/5f8ce5/32.png) [@Lucy\_Upchurch](https://discourse.slicer.org/u/Lucy_Upchurch)\
**Post date:** [January 15, 2019, 9:46pm UTC](https://discourse.slicer.org/t/images-are-not-being-displayed-but-are-loaded-as-value-changes-when-mouse-is-moved/5384/1 "2019-01-15T21:46:09Z")

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Operating system: Windows Server 2016  
Slicer version: 4.11  
Expected behavior: To see images  
Actual behavior:Displays black image  
OpenGL: 4.6

Here are the specs about my computer:

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/3/93bb5e6218857d5a1a7b668d38ad6b29417e0fc2.png)

Even though you cannot see the image, the image is loaded as the values change when I move my mouse around in the box where the image is displayed.

Is there a setting in Slicer that needs to be set or included in my path for the graphics to work correctly?

Thanks.

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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:** [January 16, 2019, 5:19am UTC](https://discourse.slicer.org/t/images-are-not-being-displayed-but-are-loaded-as-value-changes-when-mouse-is-moved/5384/2 "2019-01-16T05:19:33Z")

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Medical images have typically much larger dynamic range than what could be displayed, therefore intensity window/level operation is performed automatically when loading a volume. The intensity window may be incorrect for extraordinary image content (e.g., there is a small but very bright region in the image). You can adjust window/level by left-mouse click-and-drag up/down/left-right; or using Volumes module). If you share an image then we can see if we can make the automatic window/level algorithm more robust.

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**Author:** ![Lorensen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lorensen/32/31_2.png) [@Lorensen](https://discourse.slicer.org/u/Lorensen)\
**Post date:** [January 16, 2019, 6:35am UTC](https://discourse.slicer.org/t/images-are-not-being-displayed-but-are-loaded-as-value-changes-when-mouse-is-moved/5384/3 "2019-01-16T06:35:58Z")

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Lucy,

Long time no see.

Still at Duke?

Bill