CGLP08 - Introduction about Computer Hardcopy devices. PDF

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Introduction about Computer Hardcopy devices....

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Dated: --/--/20 Name of faculty: Anand Dohare Name of Subject: Computer Graphics Lesson Plan-8 Name of Topic: Unit 1 (Overview of Computer Graphics system) Sub Topic: Introduction about Computer Hardcopy devices. Motivation: To introduce about Computer graphics system and working principle of computer Screen or television also know about function of hard copy device. Introduction Hard copy device or output devices accept data from a computer and converted them into a form which is suitable for use by the user. The printer is an important accessory of any computing system. In a graphics system, it is the quality of printed output which is one of the key factors necessary to convince both the user and the customer. The major factors which control the quality of a printer are individual dot size on the paper and the number of dots per inch. We can obtain hard-copy output for our images in several formats. For presentations or archiving, we can send image files to devices or service bureaus that will produce 35-mmslides or overhead transparencies. To put images on film, we can simply photograph a scene displayed on a video monitor. And we can put our pictures on paper by directing graphics output to a printer or plotter. Printers produce output by either impact or nonimpact methods. Impact printers press formed character faces against an inked ribbon onto the paper. A line printer is an example of an impact device, with the typefaces mounted on bands, chains, drums, or wheels. Nonimpact printers and plotters use laser techniques, ink-jet sprays, xerographic processes(as used in photocopying machines), electrostatic methods, and electro thermal methods to get images onto paper. In a laser device, a laser beam creates a charge distribution on a rotating drum coated with a photoelectric material, such as selenium. Toner is applied to the drum and then transferred to paper. Ink-jet methods produce output by squirting ink in horizontal rows across a roll of paper wrapped on a drum. The electrically charged ink stream is deflected by an electric field to produce dot-matrix patterns. Questions: Q1. What is a hardcopy device? Q3. Explain function of printer?...