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dots per inch
Dots per inch (DPI, or dpi)〔 is a measure of spatial printing or video dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm). Many resources, including the Android developer guide, will use the term DPI interchangeably with PPI, however.
== DPI measurement in monitor resolution in pixels ==
Monitors do not have dots, but do have pixels; the closely related concept for monitors and images is pixels per inch or PPI.
Old CRT type video displays were almost universally rated in dot pitch, which refers to the spacing between the sub-pixel red, green and blue dots which made up the pixels themselves. Monitor manufacturers used the term "dot trio pitch", the measurement of the distance between the centers of adjacent groups of three dots/rectangles/squares on the CRT screen. Monitors commonly used dot pitches of 0.39, 0.33, 0.32, 0.29, 0.27, 0.25, or .
LCD monitors have a trio of sub pixels, which are more easily measured.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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