I am just at beginner level using Adobe Photoshop 7 and there is a technique I would like to learn how to do:-

I would like to add a copyright banner across the centre of an photographic image, like a web address so that it makes it unattractive for people to use my image for their own purposes.

I want it to be transparent enough so that it doesn't ruin the viewing of the image, but visible enough to make it impossible to remove.

I hope this makes sense! Many thanks for your time.

Sam.