iPhone screenshots are saved as JPGs
I use an iPhone 5s with iOS 9.0.2 & a mid-2012 non-retina MacBook Pro with OS X 10.11 GM, I have iCloud Photo Library turned on. I've just taken a screenshot on the iPhone and copied it from the OS X Photos app to Desktop. To my surprise, the screenshot was saved as JPG. :/ I expected a non-lossy format and I've always thought screenshots are saved as PNGs. When I try to send the screenshot from the Gmail app, it shows with the *.jpg extension as well.
Anyone has any idea what's going on here?
iPhone 5s, iOS 9.0.2