[0x0]

When you add a .png file to an xcode iOS project, it will add a build step to pngcrush the asset automatically. https://developer.apple.com/library/content/qa/qa1681/_index...

[msimpson]

Interesting. I did not know that. Would the same hold true outside iOS targets?

[saagarjha]

macOS supports true vector assets, so I'm guessing it reduces the need for such measures. But coming back to your question: I'm not sure, but both iOS and macOS use the same asset filetype, so I'd assume so.