Direct link :
http://pix.toile-libre.org/upload/original/1363039497.jpgThe left bar is there to indicate if your gamma is OK or not : you should see each cube and a clear separation between them.
Settings depend of your physical screen and taste.
( mine is a little washed out as i like this look and feel , but the gamma bar is always OK )
A good setting is important to make distinction between , lets say , a wall and a mob ...
A bad one and the mob already eat your brain ...
Gamma , brightness and contrast also help to don't break your eyes worst than they are already.
ps : see Sweety , i was serious.
