AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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If your model does not have Samsung's 10-point grayscale controls, there may be NOTHING you can do to fix a hump in the middle. If your models DOES have 10-point grayscale controls, you should set the 2-point controls to get the grayscale sort of OK, then fix remaining problems with the 10-point adjustments.
Whenever you have a situation where 1 or more colors "cross" each other in the RGB Balance graph, you can't usually fix the problem with 2-point adjustments... you have to have something "more" like 10-point controls (20-point in some LG models) in the TV or an external video processor with 10 or more adjustment points.
If you can manipulate the gains and offsets to get red, green, and blue to be parallel or to cross each other no more than 1 time, you can get pretty good results with 2-point grayscale controls. But once you have a situation where any one (or more) colors cross each other more than 1 time in the RGB Balance graph, there's really nothing you can do to fix it with gain/offset controls alone (assuming you haven't gotten any one (or more) gain or offset out in the weeds somewhere).
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound