Resizing the picture to 640 x 480 will distort 
the original image and make the image skinnier 
than it should be.  For many so-called widescreen 
discs, you'll have to manually edit out the black 
bars on the top & bottom.

The only problem that Hypersnap has with DVDs are 
anamorphic widescreen discs.  Due to the way 
anamorphic discs are done, Hypersnamp will take 
snapshots that are skinnier than normal.  For 
these, you'll have to manually stretch the image 
in a graphics program to 853 x 480.

PowerDVD can take snapshots as well but various 
versions always manage to screw up certain 
resolutions (like one version can do widescreen 
properly but mess up full screen snap shots).