Pixels Per Inch (PPI) describes Image Resolution which refers to the Number of Pixels contained within Each Inch of a Digital Image. A Higher Resolution/PPI Image contains More Pixels and is a Higher Quality of Image. A Lower Resolution/PPI Image contains Less Pixels and is a Lower Quality of Image. To Calculate PPI:Number of pixels ÷ size of the image in inches = Pixels Per Inch. Substitute 1 cm for 1 Inch to find Pixels Per Centimeter or PPcm2.  | 