[anathem]

I'm currently wrapping up work on an image processing module with a client. If you want I could build a dedicated service for you.

If you are running your own site, and using nginx, there's an image processing module for it that is a match for your requirement: http://wiki.nginx.org/NginxHttpImageFilterModule

[Erlend]

Thanks for that, but Im looking for a "pay as you go" service.