Does anyone know what kind of software to use to make invisible watermarks on photos? Alot of what I've found is for visible watermarks.
Specifically what I am after, is something to make an invisible watermark "copyright", that can't be seen TILL copied/scanned. We went on a cruise and got pictures taken one time that were like this, you could not copy them, as an invisible watermark would show up "ruining" the picture /copy if you did. I am looking for something that would do this, so that I can give pictures to someone without risk of them copying them.