I have a question that I need confirmation on. I know that the Apple Developer document shows App icon size at @3x https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html. Does this also apply to regular images that you use in your App? I just need to make 100 percent sure. The other stackoverflow answers I encountered just show App icon sizes, but doesn't address regular images that you use through out your App.
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Marcelo Ribeiro
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If you want your app to take full advantage of the Retina HD display then yes, you need to have all versions for all images used by your app, i.e. image.png, [email protected], [email protected].
Dont forget to setup launch screens for each iPhone size, or your bigger phones will just enlarge your app views without really using AutoLayout or using the high def images.
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It doesn't apply for regular images that you use in you app. Make sure they are with good pixels. Provide high-resolution (@2x) versions of all image assets. Images that are not @2x will appear blurry on the Retina display.
source: https://developer.apple.com/design/tips/