My laptop screen has a purple tint. How to fix it?

Question

I am using Ubuntu 18.04. My graphics card is AMD Radeon R3 Graphics.

This a screenshot of my screen.

Clearly the blue circle appears purple. Why is it happening and how to solve it?

My system is thoroughly updated and upgraded.

Or is it that I am actually color blind?

Does [this blue color test page](http://www.maccetera.com/screen/b.html) look blue or purple on your laptop screen? — Chai T. Rex, Aug 08 '18 at 17:47
Is the Night Light mode turned on in **Settings > Devices > Display**? If so, does turning it off fix it? — HattinGokbori87, Aug 08 '18 at 18:15
The little half-moon icon in the upper right indicates active night mode. Just my two cents. — PerlDuck, Aug 08 '18 at 20:28
Wait... you posted a screen shot to show us the color of your screen? This is the one time you are allowed to use a camera to take a picture of your screen, screenshots are going to be rendered by our computers as completely normal. — Sam, Aug 08 '18 at 21:34

score 9 · Accepted Answer · edited Apr 08 '19 at 05:01

9

Since version 3.24, Gnome has a built-in blue light filter called Night Mode (AKA Night Light). It is now almost a proven fact that exposure to blue light in night-time disrupts our sleep pattern. Night Mode is there for that reason: to limit your exposure to both bright and blue light from the screen. It works by applying a red hue upon screen. So when it is turned on, blue color may look purple (this is the case here, see comments on the question).

Go to Settings > Devices > Display. There you can customize Night Mode by setting activation time or controlling red-level. Or you can disable the feature altogether.

You can also change it through commmand line.

edited Apr 08 '19 at 05:01

Pablo Bianchi

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answered Aug 08 '18 at 19:04

HattinGokbori87

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Although not related I am always curious about it? How to pronounce "Gnome"? Is it like "Go" for "Godzilla" and "no" for "necklace" pronounced one after another quickly? Like "Gonome"? – Sonevol Aug 08 '18 at 19:10
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@Sonevol https://ubuntuforums.org/showthread.php?t=892670 – pomsky Aug 08 '18 at 19:25
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It's worth noting (preferably in the answer) that Night Mode is there for a reason: to limit your exposure to both bright and blue light from the screen, both of which [are thought to cause sleeping problems](https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side). Sure, disabling it is an option, but people should be made aware of the potential downsides of disabling it. – marcelm Aug 08 '18 at 20:39
And it rests your eyes. Without wearing properly coated glasses it damages your eyes. – Sonevol Aug 08 '18 at 22:16
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@Sonevol “…it damages your eyes” [ [Citation needed](https://en.wikipedia.org/wiki/Citation_needed) ] – Melebius Aug 14 '18 at 08:25

My laptop screen has a purple tint. How to fix it?

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