I've created 3 tutorials which explain how to:
- Tut01-create a watermark png preset
- Tut02-how to apply it to your images manually with the option to position it differently in every image
- Tut03-how to batch apply the watermark to a large number of images on a fixed position
The software you need is free:
- Gimp (or any other image editing software):
http://www.gimp.org/downloads/
- BatchBlitz:
http://www.sunlitgreen.com/batchblitz.html
(When installing it, make sure you decline _all_ special offers.)
Videos are a bit choppy because I recorded them in a VM. If they are hard to follow or unclear, just let me know!
Permission has been given for videos posted, do not post clips in the free section without this or you will be liable for infraction.