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Hi :)

When you are viewing a webcam you can zoom to full screen by clicking the webcam menu in the window, this will only use digital zoom and will not increase the quality and detail of the image.

If you want to broadcast your webcam at higher quality (640x480) so people viewing your webcam will see it at this size 100% (no digital zoom) then get Cam-S-t-r-e-t-c-h here:

http://www.stickercam.com/cs

Hope this helps :)
Source(s):
http://www.stickercam.com/cs