Automatically crop single images and get coordinates file

I’m trying to remove transparent margins on my png files in order to optimeze texture memory usage.
The problem:
-I have no tool for automatically cutting the image in the optimal position
-It’s hard to put it back in the original position since you don’t know in which pixel has started cutting.

Does somebody know of any tool that can do that?

I post it here because Zwoptex has the capability to do it, as it does with sprites, but for singel files it would take a lot of time.

Does the paid version of Zwoptex provide any help about that.

Thanks a lot!
Good tool by the way

Ernest [import]uid: 76413 topic_id: 20258 reply_id: 320258[/import]