Automatic resizing for 'non-retina' image versions

Question

I\'m looking for a solution that can save me from maintaining two versions of the same image, one for Retina displays (aka @2x), one another for non-Retina displays. My goal is

Answer 1

I've created http://l4u.github.com/blog/2012/04/02/resizing-retina-images-with-guard-for-cocos2d-iphone-slash-cocos2d-x/ to generate non-hd images on the fly when -hd images are created/updated. It uses guard, guard-shell and imagemagick

You can replace -hd with @2x.