Sorry, I can't I'm afraid...I did try a minute ago though...(thought the same thing)
If I do a screen grab it looks exactly the same as when at 1024X768, it doesn't show any difference at all.
The display is all shakey and jagged and distorted.
You can still make out most things. The colours are all still fine, it's just all distorted and shakey...
Hang on...I have another idea...take a photo with my mobile!!!
Please see below, the before and after shots:
The first is how is is normally (sorry about the background, my gf put that on to be festive...). The other two are very close up as at the same distance the first was taken you don't see any difference in the picture.