[Mentat_Enki]

Righty-o. Didn't mean to sound annoyed, but there has been a bit more Craigslist-y trolling-for-programmers-for-hire than usual lately it seems, and that kinda stuff needs some trouncing IMHO. :)

Also, you are going to be limited to the tools for processing images that are out there for the most part, which sadly means ImageMagick and/or GD. But not SO sadly, as both of those (while annoying to deploy, granted...) have decent bindings to everything, support a pretty good selection of images types, and have params for controlling the aspects you mentioned (except maybe smart cropping).

Everything else is arithmetic and designing a clean, RESTful URL scheme for invoking it. I guess I meant trivial in the sense that all these things are solved problems or only require a bit of time/cleverness.

I built one of these a few years ago using PHP/GD, and it performed admirably (and did everything except smart cropping in your aforementioned list...)

So, feel free to hit me up if you get stuck on any specifics. Been there done that, and can commisserate if nothing else. ;)

[Erlend]

Thanks for that, I'll let you know if I get stuck.