What app are you using to obtain images? resolution? Compression? Video format?
Web-cam images were never intended to be great, and unless you pay £70+ for your cam, they'll always be a bit grainy. Also most cams need a LOT of light to work in, low light (even that of a bulb/lamp lit room isnt enough for some cams) the image quality will be poor.
Start with, What application are you using to obtain the image from the web-cam ? .. this shouldn't matter as such, as applications don't really affect the image quality, but different apps will use different settings.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS