Here's a PNG output from the Vegas 8a Preview window.
Everything was shot 30p with matching HVX200's, but the first five images were shot to tape and the bottom right image was shot to P2. The DV tapes were dumped to disk using Vegas' vidcap60.exe.
If you open the PNG in photoshop you can see that the darkest black areas in the taped images go down to the low 20's in RGB, while the P2 image goes down to 3 or 4 or 5.
Is there an explanation for this?