Export frame as high quality image (72 ppi only?)

Hello,

I've been experimenting with saving frames from movies but it seems they can only be exported at 72 ppi, making it the same as using a screen scrap basically.  So the question is whether one can save high quality images for printing.  I've imported a movie into APP that was extracted from a DVD, and saved in mp4 format.

Thanks!

Gustavo

Santa Fe, NM