How to Adjust Screen Brightness on a MacBook

Enable or disable the light sensor in System Preferences.
Image Credit: Screenshot courtesy of Apple.

MacBooks come with a light sensor that automatically adjusts the screen's brightness based on ambient lighting, but you can override the sensor's behavior. If you are in a bright room, increasing the contrast can make the screen easier to read. If you're in a dark room, try inverting the screen's colors. This capability is a great feature when you're reading an e-book, for example. Instead of white pages with black text, inverted colors give you black pages with white text.

Step 1

This icon indicates that the screen is dimmed by about two thirds.
Image Credit: Screenshot courtesy of Apple.

Press the F1 key, which has a small light icon on it, to reduce brightness. To increase brightness, press the F2 key, which has a larger light icon. As you reduce or increase brightness the light icon appears on the screen. The bars below the icon indicate how dim or bright the screen is.

Step 2

Click the Display icon in System Preferences.
Image Credit: Screenshot courtesy of Apple.

Click the Apple menu and select System Preferences. Click the Display icon.

Step 3

Clear the check box to disable the light sensor.
Image Credit: Screenshot courtesy of Apple.

Click the Automatically Adjust Brightness check box to enable or disable the MacBook's light sensor. To manually control the brightness, drag the slider as desired. The slider works whether the light sensor is enabled or disabled.

Adjusting Contrast and Inverting the Display

Step 1

Click the Accessibility icon.
Image Credit: Screenshot courtesy of Apple.

Select System Preferences from the Apple menu. Click the Accessibility icon.

Step 2

Select the Increase Contrast option.
Image Credit: Screenshot courtesy of Apple.

Click the Increase Contrast button to make the distinction between light and dark colors more noticeable.

Step 3

Invert colors for night reading.
Image Credit: Screenshot courtesy of Apple.

Click the Invert Colors button. Instead of a white screen with dark letters, the screen turns black with white letters. If the strange color schemes are too difficult to look at, click the Use Grayscale option as well.

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