Can you take a screenshot using the ps3?

Say you wanted to take a screenshot of a game or even a blu-ray movie... how would I get around to doing this. At the moment Im only interested on taking a screenshot of Planet Earth(Blu-ray) and cant play the movie on my laptop or PC. Of all that sony technology surely you can take a screenshot.

If you cant take one with a ps3 on your TV, can you download software to play the Blu-ray for a laptop? Can Vista computers connect to the TV so it appears on my laptop. Im just discussing possible solutions hopeful one might work. My main issue; take a screenshot of a Blu-ray movie to use on my powerpoint presentaion.

Thanks, Ryan

yes? No?

I might be best off just renting the darn DVD from somewhere! Better yet maybe I can take one from my ps3! :)