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Pixels per inch (PPI) is a measurement used to define the resolution of a computer display. This metric evaluates the picture/image quality that a particular computing or output display device is able to display.
Pixels per inch is also known as pixel density.
Techopedia Explains Pixels Per Inch
PPI has various implementations in different devices. It is entirely dependent on the display resolution capability of the display adapter. In computer display devices, PPI is calculated by dividing the diagonal resolution of the display device by its diagonal size in inches. For example, a display monitor with 12-inch width and 9-inch height has a PPI of 85 in both the horizontal and vertical directions. Higher resolution will result in more PPI. Similarly, the more the PPI the better the image views will be. This is true for both for computers and printing devices.
