# Image contrast adjustment

**URL:** https://discourse.slicer.org/t/image-contrast-adjustment/15481
**Category:** Support
**Created:** [January 12, 2021, 8:04pm UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481 "2021-01-12T20:04:19Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![geokpap](https://avatars.discourse-cdn.com/v4/letter/g/8e7dd6/32.png) [@geokpap](https://discourse.slicer.org/u/geokpap)
#### Post date: [January 12, 2021, 8:04pm UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481/1 "2021-01-12T20:04:19Z")

</div>

Hi,

I’ve noticed that in the latest versions of 3DSlicer, I can’t use the left mouse click to adjust the contrast of an image. This was possible in earlier versions.

Please advice.

Thanks

---

<div class="post-metadata">

### Author: ![cyufu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cyufu/32/1779_2.png) [@cyufu](https://discourse.slicer.org/u/cyufu)
#### Post date: [January 13, 2021, 1:27am UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481/2 "2021-01-13T01:27:28Z")

</div>

You need to click the toolbar button and select the mode.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/c/6c013af95e2eb56d820b1209b911b5cd14d44324.png)

---

<div class="post-metadata">

### Author: ![geokpap](https://avatars.discourse-cdn.com/v4/letter/g/8e7dd6/32.png) [@geokpap](https://discourse.slicer.org/u/geokpap)
#### Post date: [January 13, 2021, 1:45am UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481/3 "2021-01-13T01:45:46Z")

</div>

Thanks for the reply. I’ve tried the ‘Adjust’ option, but then the left click to sort the contrast doesn’t work. Any suggestions?

---

<div class="post-metadata">

### 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 13, 2021, 1:47am UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481/4 "2021-01-13T01:47:54Z")

</div>

You need to click the toolbar button, not just select the mode. See more information here: [User Interface — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#adjusting-image-window-level)

---

<div class="post-metadata">

### Author: ![geokpap](https://avatars.discourse-cdn.com/v4/letter/g/8e7dd6/32.png) [@geokpap](https://discourse.slicer.org/u/geokpap)
#### Post date: [January 13, 2021, 1:49am UTC](https://discourse.slicer.org/t/image-contrast-adjustment/15481/5 "2021-01-13T01:49:20Z")

</div>

Thanks so much! That did the trick.