brightness levels on final product

Hi, this is my first post here. I'm currently working to build a calibration dvd
for NTSC televisions. I'm using calibration targets that I built myself in
photoshop CS2 using NTSC color space. The calibration target needs to haves
color patches under video black and above video white.

The problem is: The patches are correct, save in .psd extensions. When I encode
jpeg's or AVI's in premiere pro the patches are still correct. But when I encode
the DVD, no matter if I use the original PSD or the video encoded with premiere
pro, the brightness levels of the patches are changed, probably to fit NTSC
standard. I absolutely need the final results to be unchanged and I don't know
how.

If I need to switch from encore to another software, i'm willing to do it (as
long as there is a trial version for me to test to make sure I won't have the
same problem)