Forgive me if this has been covered elsewhere, but I couldn't find it... I'm building a website to promote/display my photography. I'll be using low res files, so I'm not worried about them being printed by someone else, but I would like to "mark my territory" so they can't be used by someone else on a different website. How do I create a watermark on my photos? Not prints themselves, but the digital images and scanned negs/prints I load to the web?