Resize images by half?

Hello! I'm a complete newbie to mac and so, don't know anything about automator or Apple script yet
But I did find out about Hazel and am looking for ways to use it in my iOS dev workflow.
The first great use would be to automagically have it resize my retina images down by half when I save them to a directory. But whatever action I use would need to have some logic to cut by half and use the same file name, minus the @2x at the end.
I use an app now called MultiRezer, but I don't know how or if you can script it w/ Applescript.

The first great use would be to automagically have it resize my retina images down by half when I save them to a directory. But whatever action I use would need to have some logic to cut by half and use the same file name, minus the @2x at the end.
I use an app now called MultiRezer, but I don't know how or if you can script it w/ Applescript.