In many situations Dots Per Inch mix, hereinafter dpi, with the pixels when they are two totally different things, although they are linked in some way. To make it absolutely clear, ppp is a measure relative, not absolute as the sensor pixels, and can only be used on a printed medium, may be to print or scan, the end of the scan is like "desimprimir".
When we say that a picture is printed at 300 dpi, we mean having a density of 300 dots of ink in each inch (2.54 centimeters), just as when we speak of scan an image at 150 dpi are saying that the scanner is able to solve 150 different points in an inch.
So if someone says that your camera has a resolution of 72 dpi or 300 dpi can tell who is living quietly in a terrible mistake, PPPs are only a measure of printing.
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