Whomever's left standing, post a sign on the door!

But, Seriously, doesn't images taken with a digital camera have the camera information embedded in the photo? If this can be easily verified, then when a "No Postwork" rule is in effect, the camera information should still be embedded. If postwork is done on the photo, it'll be missing. Ergo, the photo should be rejected by the moderators. There should not be a small size limit on the full-sized photo forcing contestants to resize and save. You can just state what setting to use to take the photo. The photo would be uploaded directly to the Renderosity contest. No more hassles.