I am making a Universal app on xCode 4.4, using Storyboards. I am making the images for this app in Photoshop. I want to make a background image that fills the whole screen.
What I want to know is:
You might need up to 10 background images:
There's the retina iPad: 2048x1536, non retina iPad and iPad Mini: 1024x768, retina iPhone: 640x960, non-retina iPhone: 320x480 and the new iPhone 5 (retina only): 640x1136.
That's 5. If you want to support both landscape and portrait, then you have 10 combinations.
PS: If you decide to keep the status bar visible (as most apps do), then reduce the height with 20 pixels (40 pixels for retina displays). That's how much room is needed for the status bar.