Are you using the still-frame feature of the camera, or exporting frames from video footage? In my opinion, the still frame feature is useless, as it is much better to pick and choose the exact right frame you want from the fotage, rather that being stuck with a 6 or 7 second frame. Other than that, I don’t know of a way to improve the resolution of an image, but you can do some amazing things in post with Photoshop and the like.
Hope that helps,
Brian Fischer
Independent Videographer/DV Filmmaker
“On a long enough timeline, the survival rate for everyone drops to zero.” – Tyler Durden