These are the recommended calibrated settings for the c6900 which is very similar (just lacks the ambient light filter believe). Nabbed from the internet....
(Cof Icon) -> General -> Game Mode -> On
Cell Light - 15
Contrast - 84
Brightness - 57
Sharpness - 0
Color and Tint - all 50 (default)
Advanced :
Black Tone - Off
Dynamic Contrast - Off
Gamma - +1
Flesh Tone - off
Edge Enhancement - off
Colour Tone - Warm2
Filters - Off
Film Mode - Auto 2
Colour Space - Custom
Red - 59 0 5
Green - 27 26 0
Blue - 0 0 66
Yellow - 47 39 4
Cyan - 29 36 53
Magenta - 56 0 56
White Balance - 24 25 24 35 24 38 (varies per model)