A Simple Shell Script to Change Display Gamma Values.
Tested on : Kali Linux 18.2 and Ubuntu 18.04.
Script uses xrandr to check and change gamma values as per your needs.
sudo apt-get update
sudo apt-get install x11-xserver-utils
git clone https://github.com/thewhiteh4t/gammachanger.git
cd gammachanger/
chmod +x gammachanger.sh
./gammachanger.sh