The Gnome 3.24 came with a new feature called night light. When sun set the temperature of the display changes from normal to a reddish tone to reduce the impact on eye. This feature is already availbale in Android 7.1, steam and other operating systems. To change Gnome 3 Night light Intensity on the system there is no default settings on the settings panel.
How to change Gnome 3 Night light Intensity
The problem is the red is a little more intense and everything in the display will turn to red.
We can control Gnome 3 Night light Intensity (reddish tone) by changing the value of intensity in the gsettings.
For that just install dconf editor from the software centre. or run an install command using as root in terminal
for Ubuntu 17.04 or 16.04
apt-get install dconf-editor
and for fedora 26 or fedora 25
dnf install dconf-editor
for other distros use the install command of the sofware.
then open the dconf editor
the go to the location
org > Gnome > settings-daemon > plugins > color > night-light-temperature
the turn off the default value and enter custom value on the box given below.
The single command for doing this thing is here.
gsettings set org.gnome.settings-daemon.plugins.color night-light-temperature <temperature>Here are some temperatures values to experiment with
1000Lowest value (full red)4000Default night light temperature5500More good and less intense night light temperature6500Default temperature (night light off)10000Highest value (full blue)
When nightlight is on there is a switch on the right top of gnome panel to turn off or on. Also user can configure whether it will turn on and off automatically by the time of the day. This is a very good way to protect the eye.
Ref : Askubuntu – stare.in.the.air