From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oliver Seitz <info@vtnd.de>
Subject: Re: Question (about setting brightness and contrast)
Date: Tue, 15 May 2012 09:46:10 +0200
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> To reduce contrast to 75%, you can use
>
> xrandr --output <which_one> --gamma 0.75:0.75:0.75

Ok, sorry, gamma is not the same as contrast. But gamma can be used to 
achieve similar shifts of the relation of dark to bright colors, so it 
might be suitable to get the desired effect here.

Greets,
Kiste