Upscaling/downscaling pixel is best done with the following equation
base resolution x factor (antialiasing)
examples
144 x 4 = 576, which is x4 antialiasing
144 x 8 = 1152, x8 antialiasing
so on and so on
App icons appear to be low resolution on high end phone is to due to the 144 px source image resolution set by Android OS.
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