Pixels per inch (PPI) (or pixels per centimeter (PPCM)) is a measurement of the pixel density (resolution) of devices in various contexts a 100×100 pixel image that is printed in a 1 cm square has a resolution of 100 pixels per centimeter (ppcm) It has become commonplace to refer to PPI as DPI, which is incorrect because PPI always refers to input resolution. Good quality photographs usually require 300 pixels per inch, at 100% size, when printed onto coated paper stock, using a printing screen of 150 lines per inch (lpi). This delivers a quality factor of 2, which delivers optimum quality. The lowest acceptable quality factor is considered to be 1.5, which equates to printing a 225 ppi image using a 150 lpi screen onto coated paper
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