Used by itself, it will display the current gamma correction factors:
$ xgamma
-> Red 1.000, Green 1.000, Blue 1.000
To set the correction factors, use the -gamma option to set the same value for all channels,
or use -rgamma, -ggamma, or -bgamma to adjust just one channel:
$ xgamma -gamma 1.5152
-> Red 2.000, Green 1.000, Blue 1.000
<- Red 1.515, Green 1.515, Blue 1.515
$ xgamma -rgamma 2
-> Red 1.000, Green 1.000, Blue 1.000
<- Red 2.000, Green 1.000, Blue 1.000
The values marked -> show the previous gamma settings; the values marked <- are
the new settings.
Note that the gamma values are passed to the server with three decimal places.
For systems with multiple displays, you can apply a specific gamma correction to a
single display by running xgamma with the -display option. When you??™re using a
Xinerama display, you may need to set the gamma for just one monitor, but you
can??™t specify the screen in the displayspec (because Xinerama counts all of the physical
screens as part of one logical screen). The -screen option lets you specify the
physical screen to be queried or adjusted:
$ xgamma -display :0.0 -screen 2 -gamma 1.3
-> Red 1.000, Green 1.000, Blue 1.000
<- Red 1.
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