If I were to wager a guess, adjusting it in WinDAS would bring certain levels to where they need to be, so that proper output would correspond to their OSD adjustments. A few posts back, Vito said something to the effect of: when properly calibrated, the FW900 should produce an inky black when the brightness is set to 50. White level should be on point at Contrast = 90. When your brightness is too high or low for 50 = black, then a G2 adjustment is needed (something that the OSD can't do). I'm assuming the same can be said for geometry, landing, focus, etc. It would be really helpful to get factory specs as to what should be what when adjusting everything in WinDAS.
Yep, I understand this, and my proviso was that one could use WinDAS to adjust the G2 voltage (so that 50 percent brightness gives inky black).
I'm more interested in the white point balance and greyscale. Once you've taken care of the G2, I see no reason why the OSD can't do a good job. Not saying there isn't a reason, I'd just like to have it explained