PPI
     Pixels per inch is called PPI. But now a days High range smartphone is always high resolution screen,For that they give more PPI and also some middle range smartphone also give Normal PPI.But low range smartphone is not include PPI.Good quality photographs usually require 300 pixels per inch. The lowest acceptable quality factor is considered 1.5. Its measurement of the pixel density.Horizontal and vertical density are usually the same but differ on devices that have non-square pixels












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