Adjusting screen brightness is an essential task for optimizing your viewing experience and conserving battery life on your MacBook or iMac. Whether you are working in a dimly lit room or under bright sunlight, having the right screen brightness can significantly enhance your comfort and productivity. This article will guide you through the various methods to adjust screen brightness on macOS, including using system preferences, keyboard shortcuts, and third-party applications.

Examples:

1. Using System Preferences:

   • Open "System Preferences" from the Apple menu.
   • Click on "Displays."
   • Adjust the "Brightness" slider to your desired level.

2. Using Keyboard Shortcuts:

   • On most MacBooks, you can use the F1 and F2 keys to decrease and increase brightness, respectively.
   • For MacBooks with a Touch Bar, you can adjust brightness directly from the Touch Bar.

3. Using the Control Center (macOS Big Sur and later):

   • Click on the Control Center icon in the menu bar.
   • Drag the "Display" slider to adjust the brightness.

4. Using Terminal:

   • Open Terminal from the Applications > Utilities folder.
   • Use the following command to set brightness to a specific level (replace 0.5 with your desired brightness level between 0 and 1):

     sudo brightness 0.5

     Note: You may need to install the brightness command-line tool via Homebrew:

     brew install brightness

5. Using Third-Party Applications:

   • f.lux: Automatically adjusts your screen brightness and color temperature based on the time of day.
   • Lunar: Allows you to control the brightness of your external monitors.