Amnesia VS Penumbra

[Sexbad]

My preference is Amnesia.
Although Penumbra had the scariest moments, they kind of went like "dah dah dah DUFF dah dah DUFF dah DUFF dah dah DUFF" etc.
While as Amnesia was more "DUFF DUFF DUFF DUFF dah DUFF" etc.
It just felt more scary overall, whereas Penumbra had some really scary moments (near the end of Black Plague I actually screamed out loud several times).

Both are great games though.

I recommend you to keep gamma at "1", and change your screen's "contrast" and "brightness" settings.
Set contrast to max and adjust gamma so it fits with DIGI Byte's post. ("basically you should see the right box as visable and the left box barely visible")
If you just can't make it fit perfectly then try to adjust the games gamma.

I dont get the part when you say screen's contrast and brightness settings. where can i change that? Actually in the game (amnesia the dark descent)'s option menu?

No, on your monitor's controls.