DPI

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Dots-per-inch (abbreviated DPI), together with lines-per-inch (LPI) and pixels-per-inch (PPI) are related terms describing display and sensing resolution.

Computer displays

Computer display resolution (not to be confused with image resolution) is commonly measured in either PPI (pixels per inch) or as dotpitch (millimetres per pixel).

dotpitch = 25.4/ppi ⇔ ppi = 25.4/dotpitch

Printing and imaging

Scanners

Scanner input resolutions are typically not square.

Input hardware

DPI refers to the sensing resolution of mice and trackballs. On most mice, the sensitivity is fixed, but gaming-orientated hardware often provides for customisable sensitivity.