As I am trying to get most out of the images it does not make much sense to me to work without a visual control mechanism as every image needs different parameters to get most out of it. So, no, at the moment there is no batch tool available.
A WordPress plugin is on my todo list for a loooong time but unfortunately I can't say when it will see the light of day.
Your opinion is so important for me! Don't hesitate to drop me a line. I will do my best to implement your feedback.