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Pixel density
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== Scanners and cameras == "PPI" or "pixel density" may also describe [[image scanner]] resolution. In this context, PPI is synonymous with [[samples per inch]]. In digital photography, pixel density is the number of pixels divided by the area of the sensor. A typical [[Digital single-lens reflex camera|DSLR]], circa 2013, has 1β6.2 MP/cm<sup>2</sup>; a typical compact has 20β70 MP/cm<sup>2</sup>. For example, Sony Alpha SLT-A58 has 20.1 megapixels on an APS-C sensor having 6.2 MP/cm<sup>2</sup> since a compact camera like Sony Cyber-shot DSC-HX50V has 20.4 megapixels on an 1/2.3" sensor having 70 MP/cm<sup>2</sup>. The professional camera has a lower PPI than a compact camera, because it has larger photodiodes due to having far larger sensors.
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