[GH-ISSUE #1188] Screenshot are dimmed on my Mac Mini 2018 (the screen is a HP Z27) #692

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opened 2026-05-05 06:31:31 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 06:31:31 -06:00

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Originally created by @clementquentin on GitHub (Sep 22, 2022).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1188

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

Hi,

When I dim my screen (HP Z27) on my Mac Mini 2018, if I make a screenshot (cmd+Shift+number), the resulting image is also dimmed.

This started yesterday and I didn't change anything to my config, or to the way I use Monitor Control.

The screen is connected through HDMI (if that matters).

I hope someone here will be able to help me !

Thanks,

PS : I just found out that if I try to make a screenshot of just a specific window (cmd+Shift+5, I tried to make one of what I'm typing here to join as an example), it only shows grey. A fullscreen screenshot (cmd+Shift+3) or partial screenshot (cmd+Shift+4) still shows what's on screen though. I attached two images to this post.

Steps to reproduce

Make a screenshot with Monitor Control on.

Expected behavior

Screenshots are dimmed at the same level as Monitor Control dims the screen.

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 12.4
- Mac model: Mac Mini 2018
- MonitorControl version: 4.1.0
- Monitor(s): HP Z27
- Apple Silicon/M1 (yes or no): no

Originally created by @clementquentin on GitHub (Sep 22, 2022). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1188 ### 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 Hi, When I dim my screen (HP Z27) on my Mac Mini 2018, if I make a screenshot (cmd+Shift+number), the resulting image is also dimmed. This started yesterday and I didn't change anything to my config, or to the way I use Monitor Control. The screen is connected through HDMI (if that matters). I hope someone here will be able to help me ! Thanks, CQ PS : I just found out that if I try to make a screenshot of just a specific window (cmd+Shift+5, I tried to make one of what I'm typing here to join as an example), it only shows grey. A fullscreen screenshot (cmd+Shift+3) or partial screenshot (cmd+Shift+4) still shows what's on screen though. I attached two images to this post. <img width="1920" alt="Capture d’écran 2022-09-22 à 21 14 08" src="https://user-images.githubusercontent.com/114185560/191832424-e99ee83c-b506-49e6-949d-045463cf7e57.png"> <img width="869" alt="Capture d’écran 2022-09-22 à 21 14 23" src="https://user-images.githubusercontent.com/114185560/191832433-1b81248a-ce39-4565-bf40-48592af8f487.png"> ### Steps to reproduce Make a screenshot with Monitor Control on. ### Expected behavior Screenshots are dimmed at the same level as Monitor Control dims the screen. ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 12.4 - Mac model: Mac Mini 2018 - MonitorControl version: 4.1.0 - Monitor(s): HP Z27 - Apple Silicon/M1 (yes or no): no ```

gitea-mirror closed this issue

2026-05-05 06:31:34 -06:00

gitea-mirror commented

2026-05-05 06:31:38 -06:00

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@waydabber commented on GitHub (Sep 22, 2022):

This happens when you are using overlay (shade) dimming instead of DDC (does not work via HDMI on the 2018 Mini) or gamma table manipulation.

@waydabber commented on GitHub (Sep 22, 2022): This happens when you are using overlay (shade) dimming instead of DDC (does not work via HDMI on the 2018 Mini) or gamma table manipulation. <img width="842" alt="Screenshot 2022-09-22 at 21 38 39" src="https://user-images.githubusercontent.com/37590873/191836124-75ed8780-2111-4748-acbf-8512cb21999d.png">

gitea-mirror referenced this issue

2026-05-05 07:06:58 -06:00

[PR #696] [MERGED] Watch for gamma table interference from external app #1182