> Maybe. As I already posted in reply to clipka, my video card driver 
> (Nvidia) allows to do gamma correcting.

You should try to set that to unity as a starting point, otherwise your OS 
GUI and any web browsing will be messed up and not as they intended it to be 
viewed.  I guess it's more there to tweak your monitor by a very small 
amount if it doesn't quite exactly match the standard sRGB gamma (a lot of 
monitors nowadays have an "sRGB" setting which I assume is at least close to 
the standard), obviously no consumer monitor is perfect unless manually 
calibrated.

> Then there is colour temperature, which can be set on most monitors. How 
> does this relate to gamma?

In theory not at all, but in practise it probably does a bit just due to the 
way its implemented in some monitors.  Colour temperature defines what the 
white point should be, for accuracy you should set this to the D65 standard 
(daylight 6500K) which is the sRGB standard.  Obviously if you tell your 
monitor to use 6500K it might not exactly use it due to manufacturing 
tolerances (or there might not even be a scale on your monitor, just "warm" 
to "cool"), that's why there are tools to calibrate your monitor.

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