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  • numpy array is a fast format and works great but takes up size due to no compression. when it is saved to a png it is compressed using lossless compression algorithims. So if you are planning to perform in memory calculations. you have no choice but to use numpy but if you want bytes data then you will need to do manual slow conversions. (Note: The above is my opinion only) Commented May 27, 2021 at 12:55