Questions about image resolution as measured in pixels per inch. PPI is either (a) the resolution of a image when it is printed at a specific physical size; or (b) the physical resolution of a display device. DPI (dots per inch), which refers to the output resolution of a print device, is often used ...

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iOS 4 retina display resolution size

I'm a little confused about the resolution here, I know the dimensions suppose to be: 320x480 points but what do I need to put for the resolution? e.g. 300 dpi? I'm designing on CS5.