May 2002
Beginner to intermediate
448 pages
13h 18m
English
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7.5 Plotters and Other Output Devices
7.5.1 Ink-jet printers
Ink-jet printers form images by projecting droplets of various colored ink onto paper. The technique has long been used in the printing and labeling industries and was first used in computer printout devices in the mid-1970s. One variety, the pulsed ink-jet printer, in which one or more columns of ink nozzles are mounted on a head that traverses the medium, is capable of high printing speeds, up to 400 characters per second. From a cartographic viewpoint, most of the early ink-jet printers had relatively poor accuracy. They were therefore used mainly for such low-accuracy applications as replicating screen displays. However, in the early 1990s ink-jet printers with high resolution, up to 400 dpi, became available, both in letter sizes and in larger sizes suitable for use as a plotter for GIS applications. Today, the color ink-jet plotter is the most popular plotter for GIS applications, being relatively economical, fast, and having satisfactory accuracy (± 0.25 to 0.5 mm) and cartographic quality (400 to 600 dpi). Ink-jet plotters can be used for both vector and raster data.
When plotting on paper the complementary colors cyan, magenta, and yellow are used. These are known as subtractive colors. Black is also used to deepen the dark areas, and the entire range is abbreviated as CMYK. Some of the new plotters use, in addition, lighter color variations of cyan, magenta, and yellow to bring out lighter nuances.
7.5.2 Electrographic ...
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