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dasgoll/calculate PPI

Created May 9, 2014 12:57
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calculate PPI
Suppose if the resolution of a mobile phone is 1920*1080 and diagonal size is 5 inch then the ppi will be 441 but how to calculate it??
Assuming the pixels are square. If they are not, you need the actual L and H dimensions.
the diagonal is √(1920² + 1080²) = 2203
2203 pixels / 5 inch = 441 ppi
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