- Start by choosing Apple menu > System Preferences.
- Select the Displays PreferencePane.
- Click the Color tab.
The Color tab kills washed out display colors
Your display’s colors should return to normal as soon as you click Color.
This is an issue I’ve seen most commonly on Mac laptops that also use an external display. Regardless of which type of Mac you use, the washed out display issue is really annoying, but at least the fix is quick and easy.