Samsung SP47W3HF - How do you calibrate it?

[AsGF2MX]

As the title says; I get the feeling the TV could look better. Though having said that, I did mess with the service menu once and I had turned on DNIe - which resulted in it restarting over and over (something must have caused the WDT not to be set).

Also as the TV isn't mine I have no clue on its actual specs. How good is it? I'm assuming it's some form of EDTV and definitely not HDTV.