New day, new app in the Mac App Store: Unretina. This app lets you Easily resize your @2x images in seconds! No need to painfully export both retina and non-retina images any more for your iOS applications. All you have to do is to open up Unretina, and drag-and-drop the @2x icon. That’s all . Unretina is currently free in the Mac App Store…..
NOTE: Supports .png .jpg .tif and .bmp.