With Marshmallow and previous version of Android, you had to root and flash a custom kernel in order to tweak RGB settings on your phone to eliminate the "warm" or "red" hue that many of these Nexus phones have. For the past year or so, this was the only reason I ever bothered rooting.
However, that's all changed with Android N. Google has FINALLY baked an RGB tuner into the stock system, allowing you to adjust the screen color to your liking.
To enable this you simply have to unlock "System UI Tuner" by pulling your quick settings drawer down and long pressing the little gear icon in the top right. Once you do this, it should automatically open Settings and show you the new System UI Tuner option. Once that's done just navigate to System UI Tuner / Color and appearance / Calibrate display. At this point you can drag the 3 bars however you want to tweak the RGB values. *Note, changes won't go live until you hit "Apply"*
Now, this isn't as intuitive as adjusting RGB values with custom kernels and kernel tweaking apps because you can't actually see the true RGB numbers. So you have to kind of just drag, test, drag, test etc. until you get it to your liking. With that said, I've spent some time tweaking mine to mirror the display color tones of my LG G5. To me, it makes the whites a pure white without being too blue and eliminates the warm hue my phone had from the factory.
Here's a screenshot of my setup:

NOTE: All displays are slightly different and settings that may be perfect for one person, may not be right for you. Just keep messing with the settings until you get it to a color tone that looks best TO YOU.
However, that's all changed with Android N. Google has FINALLY baked an RGB tuner into the stock system, allowing you to adjust the screen color to your liking.
To enable this you simply have to unlock "System UI Tuner" by pulling your quick settings drawer down and long pressing the little gear icon in the top right. Once you do this, it should automatically open Settings and show you the new System UI Tuner option. Once that's done just navigate to System UI Tuner / Color and appearance / Calibrate display. At this point you can drag the 3 bars however you want to tweak the RGB values. *Note, changes won't go live until you hit "Apply"*
Now, this isn't as intuitive as adjusting RGB values with custom kernels and kernel tweaking apps because you can't actually see the true RGB numbers. So you have to kind of just drag, test, drag, test etc. until you get it to your liking. With that said, I've spent some time tweaking mine to mirror the display color tones of my LG G5. To me, it makes the whites a pure white without being too blue and eliminates the warm hue my phone had from the factory.
Here's a screenshot of my setup:
NOTE: All displays are slightly different and settings that may be perfect for one person, may not be right for you. Just keep messing with the settings until you get it to a color tone that looks best TO YOU.
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