Is it possible to take HD screenshot in iPhone 5s? If so, how?

Is it possible to take HD screenshot in iPhone 5s? If so, how?

As far as I know, there's no other way to change the settings of a screenshot.

I think it depends of the screen resolution (1136 x 640)

The only way to take a screenshot directly on the phone itself without jailbreak is to press/release the home button and power button simultaneously. As far as I know, you can only (sort of) change the resolution by rotating the phone.

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