That's a bigger project than it at first sounds because you will need to look at the size of the image to make sure it isn't too large. Are you using profile pictures? Because if not, you could just use those for the image since dimensions are checked for it. If you are, then basically you'll need to copy all the code used for uploading avatars/profiles and put your own dimenions in for them. You'll also have to probably modify the database to add a new table for this image (just like avatars, profile picts, and signature picts have their own tables).
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