[Korrigan]

You are not losing anything. The Pi knows if the video is limited or full range.
It knows if it is outputting limited or full range and will scale between the two if necessary.
It signals to the display whether the signal is limited or full range.

In general you should just leave everything alone and you will get the right results.
The only instance you need do anything is if the display doesn't handle the limited/full range signalling, but that is pretty rare.

But I tried a full range video (http://www.avsforum.com/forum/139-displa...ation.html) and I can't get 0-15 to show.