ios5 - iOS Images for iPhone and iPad and Rotation of Images -

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i read on apple website when choose images display background image has of quality. see this link.

i developing app ios 5 xcode 4.3.2.

  1. how know if device high-resolution one?
  2. for setting background image, when rotations of device left or right, need include wider version of image? doing header , setting background name "my apple app" in background. need make wider version can stretch?


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