resolution

resolution (In French résolution) number of pixels per unit of length (pixels per inch, ppi) of input devices (camera, scanner), of the dots (dots per inch, dpi) of output devices (desktop printers, digital printing systems, plate imaging) or of the screen elements (“screen ruling” in lines per centimeter, L/cm, 1/cm, lines per inch, lpi) of print subjects. Resolution, screen ruling and grayscale are related by the following formula: (resolution [ppi, dpi] / screen ruling [lpi])² +1 = grayscale [number]; for this reason, a pixel diagram in the required output size should have a resolution of at least 300 ppi × 300 ppi. Special features of digital printing systems: Resolution is given in dpi × dpi, because horizontal and vertical values can differ; inkjet production printing systems can as a rule realize 600 dpi × 600 dpi physically, and 1200 dpi × 1200 dpi through interpolation.