Start with a bigger picture.
If your picture is something like 320X180 pixels, when you zoom in it’s still 320X180 pixels. But because you’re trying to display it in a large frame, say 640X360 pixels, then the picture will double-up on the displayed pixels.
When you zoom-in you are just blowing up the available pixels. Start with an image in the *ending* size and resolution.
Steve Mann
MannMade Digital Video
http://www.mmdv.com