Would somebody please clarify this for me? The iPhone 4 has a resolution of 640 x 1136px so if I wanted a square icon, for example, to take up half of the screen, the PNG should still be 640 x 640px because it will be downsized by half? Or do I just create a 640 x 1136px canvas and however it appears there is how it will appear once uploaded on the app?
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You make your images twice as big to work on 2x screens. Whether you create the entire canvas or not would depend on how the app is being built.– DA01Commented Dec 10, 2015 at 23:32
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Is there any way to control or prevent a 2x image from downsizing and showing partial pixels for straight lines?– lurning too koadCommented Dec 10, 2015 at 23:41
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Are you working in Xcode or in browser? I'm assuming you're coding in Xcode - in which case this documentation will help.– BentoCommented Dec 11, 2015 at 2:36
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1 Answer
640 × 1136 px² is already the 1:1 resolution, meaning these are physical pixels of the screens.
So yes, you create a 640 × 1136 canvas, create your icon in the dimensions that you desire, and then crop it out.
Your final icon file should have the dimensions of 320 × 320 px².
