Write on image in faint color

Hi, This was asked some time ago but cant find it in the archive, anybody remember how it was solved please write and tell me. Requirment: Write domain name in faint color on picture (a kind of "watermark") Reason: I have 3 directories full of images that are original to our site and I spent a crapload of time scanning them and putting them up, I dont want others to just "borrow" the images and use them without giving us some type of credit... I found a package on google after searching that you just throw all the images in a folder and it generates the thumbs for you in a folder called "thumbs", can i do the same for this too? ie. throw all the images in a folder, run the program and get www.sitename.com written on all the images? Any help and reminders appreciated. Cheers, -Ryan