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pixels per inch (ppi)

In computers, pixels per inch (ppi) is a measure of the sharpness (that is, the density of illuminated points) on a display screen . The dot pitch determines the absolute limit of the possible pixels per inch. However, the displayed resolution of pixel s (picture elements) that is set up for the display is usually not as fine as the dot pitch. The pixels per inch for a given picture resolution will differ based on the overall screen size since the same number of pixels are being spread out over a different space. The term "dots per inch" ( dpi ), extended from the print medium, is sometimes used instead of pixels per inch.

This was last updated in March 2011

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