1) Write down the original values..
2) The RCUT Values change the dark grey scale, but it has quite a huge effects on the entire grey scale.. A grey scale ramp is a great test pattern to use..
3) Very important about the Cut Values.. If they are too high, they will have impact on the black level, and turn black into dark grey.. when one color is too bright, of course this color will be dominant.. Also if they are too low.. black crush.. So all 3 Cut Values work like a black level/brightness starting point..
4) Usually the RGB Cut Values are similar or have the same Value.. So a much higher green number is quite unusual.. Reduce it..
2013 Panasonic TX-P42STW60 PDP
2009 Panasonic TX-P42S10E PDP