A free app for Android, by XDA.

[ROOT] Sa2ration is a free mobile app that allows you to change your rooted Android Oreo device’s saturation level. It allows you to toggle sRGB colorspace or the Color Management to do that. [ROOT] Sa2ration requires a root to work.

Please take note that will only work and function on both Pixel 1 and Pixel 2, but it will likely work on other Oreo devices too. We cannot guarantee you that this app will work on other devices or Android devices so use it at your own risk.

The app is easy to use and the interface is intuitive as well.