How to calibrate the monitor on an Ubuntu system?

You can use GNOME Color Manager to install color profiles, perform calibration and adjust color settings. For full functionality, you'll need ICC profiles that provide the required information for your devices.

If you don't use unity (or gnome), using gnome-color-manager does NOT work (see How do you set system display color profiles in Xubuntu and Lubuntu? for the glory details).

However, there is an excellent german howto all necessary things manually: http://wiki.ubuntuusers.de/Monitor_profilieren_mit_ArgyllCMS

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I ran into the same issue using Ubuntu Mate 16.04. The solution was really simple. Go to Ubuntu Software Center and do a search for DisplayCal. Their direct url is http://displaycal.net/. It works amazingly well and quite simply utilizing my Spyder 3 Elite spectrometer. You will have to have a spectrometer to do this. In a dual boot system with Windows, you can import the icc or icm profile from Windows to Ubuntu.

Hope this will help others who have run into this issue.

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I am not sure what you mean by calibrate, so ill take a few stabs.

1. You can try pressing "Auto" on your monitor, if its an LCD.
2. YOu can try installing f.lux That will manage your color tint according to the time, and brightness setting.
3. If none of the above are answers to your question, then try adding a few more detials to your question.

EDIT: after OP added a detail, this should help: type this on a console/terminal.

first, just type xgamma to get the RGB values, in case you want to revert. Then,

xgamma -gamma 0.9 the 0.9 is the gamma value. Try a few diff combinations of RGB.

To do a colour calibration (this is the process that the 'Calibrate...' button will start) you would need to use a spectrophotometer. These measure the colour produced by monitors or printers.

The basic process is that the screen will display a number of coloured patches one after the other and the spectrophotometer will detect the actual colour produced on the screen. This allows the software to compare the colour produced with the colour that was requested.

After the process is completed Ubuntu will have a profile specifically for that monitor (or printer) that will tell it what colour to request to get the colour that it actually wants.

If you want to change screen settings without calibration hardware, you can use terminal utility xcalib, it is in the ubuntu repository, so type

sudo apt-get install xcalib

and you can see the options with the command

xcalib -help

You can use brightness controller , it's not accurate , but provides you tweaking the rgb Install Brightness Controller with the following commands:

sudo add-apt-repository ppa:apandada1/brightness-controller sudo apt update

This does not make your brightness function keys work, but is a workaround.

Install Brightness Controller with the following commands:

sudo add-apt-repository ppa:apandada1/brightness-controller sudo apt update For Version 2 with Multi Monitor Support and Color Temperature support:

sudo apt install brightness-controller

You can use xgamma command line also this is a link of this https://linux.die.net/man/1/xgamma

you can try this and see a result as a test xgamma -bgamma 1.0