DVCPRO HD 720P: pixel aspect ratios with still images from Final Cut

I am currently trying to get still images from a trailer I am working on with Final cut pro. The footage is DVCPRO HD 720P 24pn and the interlacing and pixel aspect ratios have been giving me a lot of trouble in photoshop. I am able to convert the PAR but it is for preview purposes only...? I need the file to be saved with the converted PAR. How do you do that???
Also, the de-interlacing filter on photoshop doesn't seem to help the quality of the photo.

Anyone have any ideas?

I have searched and searched and only found somewhat related questions, so maybe I am the only one trying to do this...