Do you have Deep Color Mode enabled on your MiBox?

by 2018WorldCup

It makes the image oversaturated on my TV. Like an Instagram filter

Bodycount9

Not many TV's could do deep color. It was a passing fad like 3D was.

koshergoy

There is improved treatment of this issue in the "Droid Settings" app introduced in Oreo Build 2094.

http://ibeam.me/droidsettings for screenshots