Projector has a magenta color cast from Apple TV

On your Apple TV menu, go to Settings > Audio & Video. Scroll down to the HDMI Output menu and use the Select button on your Apple Remote to choose one of the following options: RGB High, RGB Low. Do not leave on Auto. Source: https://support.apple.com/en-us/HT203782
Published on: 2015-10-21 See other articles in Apple TV.