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Windows 7, 8.1, 10 (64-bit)

↳ v0.9.58


8.1/10 recommended. (See why below)



sudo apt install (or other package manager equivalent):
* Optional. Recommended if you are running a DE/WM without Qt integration (e.g. GNOME).
Build and run with these commands:
  1. git clone https://github.com/Fushko/gammy.git
  2. cd gammy
  3. qmake Gammy.pro
  4. make
  5. ./gammy
NB: If make fails with "PlaceholderText is not a member of QPalette" errors, your Qt installation is older than 5.12. Updating Qt is recommended, but as a workaround you can manually delete the offending lines in "ui_mainwindow.h".

Source code: GitHub


Gammy starts minimized in the system tray. Click on the icon open the settings window.


What is it?

It's a free tool whose purpose is to aid the eyes in adapting to rapid changes in screen brightness.

It can dim the screen if its content is too bright, or brighten it otherwise. This can help your eyes adjust when switching between dark and light windows, especially at night or in suboptimal lighting conditions.

How does it work?

Gammy periodically takes a screenshot, then gradually adjusts the brightness of the screen based on its contents.

The screenshot process is hardware accelerated in order to provide great performance.

Why does changing the brightness and temperature to a certain value has no effect?

By default, Windows limits the available gamma range that can be used.

To fix this: right click on Gammy, click on "Run as administrator", then restart Windows to enable the full brightness/temperature range.

Why is Windows 8.1/10 recommended over Windows 7?

The interface that Gammy uses for taking a GPU screenshot is unfortunately unavailable in Windows 7.

A less efficient screen capture method is used instead, which still does the job, but might cause a screen stutter when moving windows.

I have a bug report/feedback. How do I tell you?

You can create an issue on GitHub, or send me an email at: [email protected]


The latest changes can be seen on GitHub's releases page.