Yeah, I had the same thing. Yours may differ from mine, but this is what I have,
All Channels:
Brightness 52%
Contrast:32%
Gamma 1.00
Red:
Brightness 52%
Contrast 42%
Gamma 1.00
Green:
Brightness 52%
Contrast 27%
Gamma 1.00
Blue:
Brightness 52%
Contrast 27%
Gamma 1.00