Thank you for posting that, Merc250D.
I think it means "Whiter than white", or WtW . As I understand it this should only be selected if the source material is faulty and for some odd reason is sending a grayscale which has shifted. I believe this is a rare event for folks like most of us who use this pj for cable, sat., OTA tuners, and disk players, but may be of value for improperly calibrated camera feeds or certain computer feeds.
I believe this will visually brighten the entire image so that the overly bright parts instead of being clipped (i.e. not being shown), it will suddenly expose them but
at the cost, I assume, of also brightening everything else, including the black area. This will often induce a bit of "pop" to the picture but it is not really accurate, it's just a trick that fools the mind/eye.
It is discussed here and I have put in bold text the important part (at least for my use):
"RGB Full and RGB Limited are a different story. The names are confusing, as you would assume you always want the full information. Why would someone ever choose to have something limited? Well it comes down to TVs vs. PCs and how they handle a video signal.
TVs use a video range from 16-235. It considers levels below 16 to be black, and information above 235 is white. A calibrated TV will never display anything below 16 as anything other than black. Most will also treat everything over 235 as white since it should not exist in video content.
PCs are different and use a range from 0-255. There is no data below 0 or above 255 with an 8-bit video signal as there are only 256 possible values. In short, this is much simpler to understand as the TV concepts of Blacker-than-Black and Whiter-than-White do not exist.
RGB Full and RGB Limited exist because of this difference. TV programs and movies use the 16-235 range of values. Video games and PCs use the 0-255 range of values. Since TVs and PC Monitors use different scales, there has to be a way to convert between the two. Setting this RGB Full and Limited setting does that.
With a TV you should always use the RGB Limited setting
. Limited refers to the values being limited to 16-235 and not the Full 0-255 scale. With TV and Movies, it leaves them untouched because they are already in the 16-235 range. When you play a video game, it will convert the 0-255 range to the 16-235 range. If it did not do this, shadow and highlights would be pure black or pure white, and the image will look off. You aren’t losing anything by using RGB Limited, but if you use RGB Full with a TV you are losing details. You’ll want to make sure you have Brightness and Contrast set correctly by using a Calibration Disc "