scale up images for retina display on iphone 4

if you include the suffix "@2x" at the end of your image names the app will use these images instead of your regular low res images. For example if I have an image "title.jpg" I can include "title@2x.jpg" at twice the resolution and this will be used on iphone 4's so that your apps will look pretty on the new display and not so grainy.

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