[GH-ISSUE #865] Screenshot from external screen is dimmer when MonitorControl is set to `Avoid gamma table manipulation`? #543

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opened 2026-05-05 06:12:37 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 06:12:37 -06:00

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Originally created by @Paul-B on GitHub (Dec 28, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/865

Before opening the issue, have you...?

Searched for existing issues
Looked through the wiki
Updated MonitorControl to the latest version (if applicable)

Describe the bug

When I take a screenshot of anything that is displayed on the external screen then it looks dimmer. As if it has a transparent black overlay.

Steps to reproduce

-Take screenshot
-Open in preview (or anywhere else)

Expected behavior

Normal brightness screenshot

Anything else?

From external screen:

After moving to laptop screen

Environment Information (please complete the following information)

- macOS version:12.1
- Mac model:Air
- MonitorControl version:4.0.2
- Monitor(s):Lenovo Q27h-10
- Apple Silicon/M1 (yes or no): yes
- USB-C

Originally created by @Paul-B on GitHub (Dec 28, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/865 ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] Looked through [the wiki](https://github.com/MonitorControl/MonitorControl/wiki) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the bug When I take a screenshot of anything that is displayed on the external screen then it looks dimmer. As if it has a transparent black overlay. ### Steps to reproduce -Take screenshot -Open in preview (or anywhere else) ### Expected behavior Normal brightness screenshot ### Anything else? From external screen: ![image](https://user-images.githubusercontent.com/1169385/147583165-2ae0c8d8-d89b-45f3-b9ec-7732c501e9c9.png) After moving to laptop screen <img width="348" alt="image" src="https://user-images.githubusercontent.com/1169385/147583219-666d851d-53c0-415e-af0a-b7b541e0277d.png"> ### Environment Information (please complete the following information) ```markdown - macOS version:12.1 - Mac model:Air - MonitorControl version:4.0.2 - Monitor(s):Lenovo Q27h-10 - Apple Silicon/M1 (yes or no): yes - USB-C ```

gitea-mirror closed this issue

2026-05-05 06:12:38 -06:00

gitea-mirror commented

2026-05-05 06:12:43 -06:00

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@waydabber commented on GitHub (Dec 28, 2021):

This is normal if you use "Avoid gamma table manipulation" under Displays. You need to enable this option only if you are using flux and the two apps are in conflict or you are using DisplayLink which does not support gamma table manipulation.

@waydabber commented on GitHub (Dec 28, 2021): This is normal if you use "Avoid gamma table manipulation" under Displays. You need to enable this option only if you are using flux and the two apps are in conflict or you are using DisplayLink which does not support gamma table manipulation.