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I have got a laptop and i would like to correct gamma color on my external screen.

My system: Laptop, VGA port, Linux, Ubuntu.

In option System->Preferences->Monitor i turn off my laptop's screen.

But bash-command xgamma -gamma 5 does not any effect. BTW on laptop is (if it will turn on) too.

How can i get it?

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migrated from Jul 27 '12 at 18:55

This question came from our site for professional and enthusiast programmers.

You can use the xrandr utility to change the gamma settings on external displays.

Here is how it works:

xrandr --output VGA-0 --gamma 1.5:1.5:1.5

Replace 1.5 with other values and see what works for you.

Also, to get the correct identifier for your external display (VGA-0 in my case) you can run

xrandr -q

to get a listing of all displays recognized in your system.

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