https://wccftech.com/iphone-x-true-tone/

Here’s a complete step by step guide on how to disable or enable the True Tone display feature on iPhone X, iPhone 8 and iPhone 8 Plus.

A feature exclusive to the iPad Pro, True Tone has made its way to the iPhone X, iPhone 8 and iPhone 8 Plus. It’s a simple feature that adapts the tone of the device’s display to match your ambient environment. For example, if you are in a room lit up by warm lights, then your display’s tone will match up, giving you a slightly warm feel. It’s a cool little feature but might not be for everyone since it can become an obstruction if you are doing color accurate work, or just don’t like the display having a mind of its own. So, in today’s guide we will show you how to turn the feature off, or on, depending on your needs.