That is a really tough shot. Primatte Studio and Chroma Key Studio are specifically designed to key green/blue screens, not arbitrary background colors, and particular not neutral backgrounds. Those filters just won’t work on a gray background like this. The luma in her shirt is also very similar to the background so a lot of the other BCC keying filters will have a hard time isolating this. I think you’re a Vegas user so I’ve attached a very rough mockup of one approach in Vegas. It duplicates the track and puts a holdout copy on the upper track to preserve the interior of the foreground. BCC PixelChooser is applied to the upper track with Matte disabled, output set to Multiply Alpha, and Mocha used to loosely roto just inside the foreground. If you have a lot of motion in the shot this will take a much more thorough job of rotoing the foreground to really get it to work, but you could limit this to her shirt which is where the holdout is most needed. Then on the underlying track it uses two more copies of BCC PixelChooser, both set to Multiply Alpha. One copy uses Mocha for a rough garbage matte, again requiring a more sophisticated roto/tracking setup if there is much motion. The second copy of BCC PixelChooser uses the Key option in the Matte section to try to isolate the background wall color to key out the remainder while still preserving some edges. You could clone multiple copies of it to work on more narrow color ranges. Definitely not simple or awesome, but it’s a possible approach for this tough shot. Synopsis - holdout interior on one track, garbage matte + PixelChooser’s color key on second track.
ToughKey.zip (129.5 KB)