On the Brightness Test screen of the THX Optimizer, not all the squares across the top were visible. So in all three picture modes, I changed the Brightness from 45 to 55. Now, all the squares across the top are visible. The real trick is not to let the darkest square rise above the TV's surface(serfice?) black. In Dynamic mode, set the Contrast to 85. In Standard mode, set the Contrast to 90 and the White Balance RGB Offsets and Gains to 25. In Movie mode, set the Contrast to 100 and the White Balance RGB Offsets and Gains to 25. For best static performance, use Movie mode on a regular basis. When I say static, I mean as little autodimming as possible, or in the case of Movie mode, totally eliminating autodimming. The rest of the settings can stay as I posted them a few days ago.
Saying that this TV sucks is an overexaduration. Even with its two noticeable issues, its picture and audio are fantastic. KKL10's explanation of the tint change on peak whites sounds spot on. Although it's only the last shade of white on the MonitorPerformance screen of the THX Optimizer, I wish this TV was able to push reds that extra mile so maximum luminance could be obtained and I didn't have to turn the contrast down. I tried selecting a color temperature of Cool. While that provided more consistancy from black to gray to white, it made other things look bad. So giving up some luminance seems to be the only solution. At least I am still able to have things higher than calibrated by the reviewer who inspired me to get this TV, obtaining a level higher than the stated 347.39 CD/M2, making this TV good for daytime viewing. Also, itwould be helpful if there is a way to completely eliminate autodimming for a more responsive picture. I wonder if Samsung could make reds go that extra mile and give us the option to turn off autodimming via a USB firmware update. It would be nice.