I guess it really just depends on what your final output is. I mean - are you looking to publish your grabs, blow them up or is it web-only? Might make sense if you were going to have prints made but for the web, it's gonna get crushed anyway.
Ryan's mentioned route works fine. You didn't mention what you needed high-res grabs for.
Well, exporting through FCP is at full resolution. The size it exports is the actual size...
any bigger and you'd have to be uprezzing, and that would add artifacts that aren't true to your picture. There are some good uprezzing programs out there that make it look great, but they're still adding to your original shot.
I get it...makes sense.
I just wanted to do the same thing peple here used them for. Analize image, share with other etc. The grabs here looked big and with a great quality that I thought they used something diferent.
Its nice to clear that out.