How do you change the resolution on iphone 11.
I need to make it higher
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The rear camera is quite capable of producing a file to be printed at 3” X 4”, assuming the crop hasn’t been too drastic. Typically, you would need an image that has approximately 200 pixels per inch of print. So for your 3 X 4 example, you would need an image that is ~ 600 X 800 pixels (as a minimum).
