At Lyle Andrew’s request, I’ve added a batch processor utility into Art Helper. It’s still in testing (ping me by email if you’d like to help), but it works like this:

You pick a folder, it searches that folder for art files. They have to use an even pixel size in both dimensions. Art Helper then creates an output folder for the new pairs and builds them there. This way, he doesn’t have to drag in each item to process it.

Want new features? Just let me know and I’ll see what I can do. This is basically a crowd-sourced tool.