Stands for Dots Per Inch. The more the number of dots that can be squeezed in a square inch, the better the quality of image and text output. Computer screens have very low DPI generally ranging between 72 and 120 DPI, and that sometimes makes the text harder to read and images less detailed due to insufficient detail. On the other hand printers and scanners support high DPI values sometimes as high as a few thousand, so the output of printers are almost always better than screens, and scanners can transfer richly detailed pictures to computer screens, but chances are high that pictures scanned in high DPI settings may not fit to your screen without scaling due to the low DPI of computer screens.
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