Can I increase the size/resolution of screenshots?

[zerocontrast]

I searched the forums several times and I was not able to find if someone had posted this question already. I am using Windows XP and have VLC version 1.0.5. I love the screenshot option, but I really want a way to increase the size of the screenshots. Is there any way to do this? Thank you sooo much to anyone able to help.

[VLC_help]

Tools -> Preferences... (show settings: All) Video and Video snapshot width and height

[zerocontrast]

I have tried changing these settings, but with no luck. Some values I try substituting cause empty screenshots. Essentially I am hoping to get a screenshot that is the size and resolution of what I see when watching a full screen movie. (I realize this can be done with Windows itself, but of course Windows is limited to doing only one snapshot at a time rather than numerous snapshots in quick succession like VLC allows.) What would be an Ideal value for the snapshot width and height to get the size I'm looking for?

[zerocontrast]

Well I figured it out on my own, it had thrown me off that the initial values were -1 for the width and height, so I was assuming the dimensions were going by some sort of ratio. I decided to enter what should be the resolution/pixel values for my monitor (mine is 1280x800) and now I have decent sized snapshots. Also choosing png instead of jpg does give a noticeably sharper snapshot.