How to improve Google Nexus 4 display screen colour? Yes, improve Nexus 4 washout screen colour is one of the reasons that I installed custom kernel. Most of the Android devices did not have display colour calibrated at factory like iOS devices (Yes, iPhone and iPad have better screen colour). But on Nexus 4, you can do so manually. With custom kernel that support colour settings, you can improve Nexus 4 display screen colour by tweaking red, blue and green colours, gradient / gray and gamma values. Some custom kernel set colour settings by default so that you won’t have to do so manually. And some you have to do so manually.