What are the proper dimensions of a background image on iPhone 7 Plus? I have seen answers which indicate 1242x2208 which gets downsampled to 1080x1920 on-the-go. I cannot understand, why 1242x2208 is the appropriate size, since 2208px/0.66 (equivalent to 2/3) is not equal to iPhone 7's height (1334px). I know I can make my image be 1334px, it wouldn't be a big problem. But I don't understand the math behind it.
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Possible duplicate of [iPhone 6 Plus resolution confusion: Xcode or Apple's website? for development](https://stackoverflow.com/questions/25755443/iphone-6-plus-resolution-confusion-xcode-or-apples-website-for-development) – May 27 '17 at 14:36
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Logically the device accepts input of 2208px x 1242px for rendering which divided by 3x retina factor ends up as 736 x 414 logical points frame. The downscaling by 1.15x for the physical 1920 x 1080 pixels happens in the iPhone hardware rendering pipeline. This allows Apple keeping the same frame coordinate system for 1x 2x 3x screens.
Kamil.S
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1As illustrated by [PaintCode](https://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions) – Xavier Lowmiller May 27 '17 at 15:11