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I saw this on nVidia application. We can control, for each component of RGB, these 3 values: gamma, brightness and contrast (below showing only for Red component):

enter image description here

So, I want to know if we can access these 3 controls for each component from the command line.

I already know about xgamma but what about brightness and contrast for each component?

I think these answers are near what I need, but I can't find a way to do exactly what I ask by using these tips:

How do you change brightness colour and sharpness from command line
Is there a software utility to adjust screen gamma brightness contrast

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Aquarius Power
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  • well... the quite obvious answer (for nvidia users) is to direcly modify the config rc text file, and load it from the command line with nvidia-settings -l :) – Aquarius Power Aug 08 '16 at 18:00
  • I found one command that deals with the 3 components. xcalib. But that requires icc profile to modify and load. but couldn't get that worked for me – Anwar Aug 23 '16 at 06:42
  • @Anwar it seems to require an icc profile file, could be because my monitor is CRT? – Aquarius Power Aug 24 '16 at 21:29
  • My monitor is not CRT, but here is same. However I saw KDE have GUI method for doing these. You can try with a Live Kubuntu. But didn't change anything in my external monitor. May be because it's external – Anwar Aug 24 '16 at 21:39
  • @Anwar kde settings gives access to hardware display, but there was nothing about brightness etc, whas there you mean? or some specific kde aplication? – Aquarius Power Aug 24 '16 at 23:36

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