Avoiding duplicate images

So the system can recognize that an image is a duplicate when I upload an image twice. Note: when I first thought to write this the first image uploaded was still pending. Not sure if that matters. So can't the eggheads on staff somehow tweak the algorithms so that the system can recognize a duplicate from another contributor that's already posted? As soon as a trailer drops everyone does screen grabs and uploads files. Usually causing duplicates. Plus posters often get duplicates.