I tested this by cropping images to Apples default wallpaper resolution then drawing a red box on top the pixel size of the iPhones screen resolution. I then loaded the resulting image into my iPhone and checked to see where the edges of the red box fell on screen. After trying a number of different cropped resolutions I discovered if I made any changes to the resolution set by apple the box would no longer line up ideally on the screen at a neutral position.

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