The screen PPI is the number of pixels per inch. Pixels per inch represents the number of pixels per inch.

How is the screen PPI calculated? In fact, the method is very simple, calculate the number of pixels in th e diagonal direction (right triangle) with the number of pixels with long and high, and then divide the number of pixels in the diagonal by the screen size is ppi, the formula is expressed as \(PPI = √ (X^2+Y^2)/ Z\) (X: length pixel number; Y: width pixel number; Z: screen size).

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