Make 'hidden' watermarks possible. That is watermarks that is not so easily recognized but can be used to prove ownrship of the photo. Such a watermark could consist of certain pixels mathematically distributed over part of the picture by a key stri

Make 'hidden' watermarks possible. That is watermarks that is not so easily recognized but can be used to prove ownrship of the photo. Such a watermark could consist of certain pixels mathematically distributed over part of the picture by a key string choosen by the user and should need the program and the key string to be read.