iOS 4 retina display resolution size

I’m a little confused about the resolution here, I know the dimensions suppose to be: 320×480 points but what do I need to put for the resolution? e.g. 300 dpi?

I’m designing on CS5.

Answer

Should my images be saved at a specific PPI?

No. iOS ignores PPI (pixels per inch) stored inside images. However,
the pixel dimensions of your images do matter, so make sure you get
those right. It’s also important to ensure your 2× images are exactly
double the dimensions of your 1× images and that elements within the
image are in the same positions—your Retina images should be identical
content to their smaller counterparts, but with more detail.

(via http://bjango.com/articles/designingforretina2/)

Read the above article it’s invaluable, if you’re designing for iOS. Dimensions matter, the PPI is irrelevant.

Attribution
Source : Link , Question Author : Yashar , Answer Author : program247365

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