Digital TV has blacks at 16RGB for black and 235RGB for white. If you color correct everything in Avid that way for broadcast you’re set. The issue is that some MPEG encoders (Compressor…), assume everything to be full range and then constrains to 16-235. If you are encoding in Sorenson Squeeze, there is a settings that you check telling it that levels are 16-235 and it will leave them alone.
So – if using Sorenson: export as 601/709 and check 16-235 range in the encoder.
If using compressor: export RGB.
Michael
Michael Phillips