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1.) Just crop (and then resize if desired)
2.) keep it like that
3.) mod4 resolution means that both the width and the height are divisible by 4 without any remainder.
Example:
width: 1920 / 4 = 480, remainder 0
height: 1080 / 4 = 270, remainder 0
=> 1920x1080 is mod4
mod16:
width: 1920 / 16 = 120, remainder 0
height: 1080 / 16 = 67, remainder 8 (67.5)
=> 1920x1080 is not mod16
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