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Up to a point, printers with higher DPI produce clearer and more detailed output. A printer does not necessarily have a single DPI measurement; it is dependent on print mode, which is usually influenced by driver settings. The range of DPI supported by a printer is most dependent on the print head technology it uses.
Lines per inch (LPI) is a measurement of printing resolution. A line consists of halftones that is built up by physical ink dots made by the printer device to create different tones. Specifically LPI is a measure of how close together the lines in a halftone grid are. The quality of printer device or screen determines how high the LPI will be.
A HP LaserJet 4000n printer. The LaserJet 4000/4050 and their respective variants were the first printers released in the 4000 series. The LaserJet 4000 series printers print letter paper at 17 pages per minute, and can be set to print at 600 dpi or 1200 dpi, although when set to print at true 1200 dpi, the printer runs at reduced speed.
A dot matrix printer Sample output from a dot matrix printer. Dot matrix printing, [1] sometimes called impact matrix printing, is a computer printing process in which ink is applied to a surface using a relatively low-resolution dot matrix for layout.
Because, through the dithering process, the printer builds a single image pixel out of several printer dots to increase color depth, the printer's DPI setting must be set far higher than the desired PPI to ensure sufficient color depth without sacrificing image resolution. Thus, for instance, printing an image at 250 PPI may actually require a ...
The LaserJet 4 series had small printers in the range: the personal-use 4L and the small-business use 4P (and the Macintosh-compatible 4ML and 4MP). These printers both used the Canon PX engine, [7] which like the EX was new at the time of release. The 4L used the 300 DPI [8] PX engine, with the 4P using the upgraded 600 DPI [9] PX-II engine. [1]
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Printer technology (e.g. InkJet/Laser/Color Laser) Printing speed (typically given in pages per minute or ppm) Resolution DPI - this is an important metric for both printing and scanning quality. (Note that print DPI is rarely greater than 600dpi actual.