This is what I use in production right now. It works well once you figure it out, but backwards compatibility with the previous Thumbor based version isn't as g

This is what I use in production right now. It works well once you figure it out, but backwards compatibility with the previous Thumbor based version isn't as good (or at least correctly documented) as they say. And the previous Thumbor based processor just stopped working one day. It's not as robust as a system as I expected.