I've been rehashing images by adding junk to the end of the file to make them somewhat harder for spam bots to detect. However, every time I upload these images to an online service, they remove the junk at the end. Where can I find an image hosting service that doesn't put your uploaded images through a filter of any kind, and just leaves them as is? I've tried Flickr, Photobucket, TinyPic, Dropbox, Google Drive, and Imgur. All of them delete the junk data, then make all image hashes the same.