Presentation top top theme: " A printer is an output machine that produce text and graphics top top a physical medium such together paper. Printed info is often dubbed hard copy because."— Presentation transcript:
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2 A printer is one output maker that produces text and also graphics ~ above a physical tool such as paper. Printed information is often dubbed hard copy due to the fact that the information exists physically and is a an ext permanent kind of output than that gift on a VDU (Monitor). Printers deserve to be group into influence and non- affect printers.
3 An impact printer forms characters and graphics on a piece of document by highlight a mechanism against an squid ribbon that physically contacts the paper. Instances are Dot-matrix and also Character printers.
4 Non-impact printers execute not touch the record while printing. They usage chemical, warmth or electric signals to etch the signs on paper. Examples are Inkjet, Laser, Thermal.
5 The printing rate of a printer is normally expressed in pages per minute. Press resolution is often expressed in dpi (dots per inch). The bigger the number, the higher the resolution. Advantages: Information developed is permanent. Disadvantages: the time to obtain the printout is slow, when contrasted with display screen devices. Record is wasted because that obtaining the output. Printers are typically noisier than display screen devices.
7 A dot-matrix printer is an impact printer the produces printed photos with a print head striking mechanism. many dot-matrix printers use continuous-form paper. These usage rows (a matrix) of needles which are made to impact with one ink-ribbon to do the sample of the required character on the paper. each character as a team of little dots.
8 Tiny metal rod, also called a "wire" or "pin“. One or 2 columns of dot hammers Speeds range from 200 come 400 cps. castle are reasonably cheap come buy. The speed of a dot-matrix press is generally measured by the number of characters per second (cps) it can print.
9 benefits of dot-matrix printers: Dot-matrix printers have the right to print both text and also graphics. Dot-matrix printers deserve to withstand dusty environment, vibrations, and also extreme temperature. defect of dot-matrix printers: Dot-matrix printers are usually noisy due to the fact that of the to mark mechanism. publish quality that dot-matrix printers is no as good as those native ink-jet printers and laser printers
11 an ink-jet press in a non-impact printer that creates characters and graphics through spraying tiny drops of liquid ink onto a item of paper. Ink-jet printers can develop letter-quality text and graphics in both black-and-white and also colours. printer resolution is measure up in dots per customs (dpi). The speed of an ink-jet press is measure in lines every minute (lpm).
12 Advantages: medium to low purchase cost. nearly silent printing. wonderful quality text and also colour images. can print overhead transparencies Disadvantages: High running costs. faster than a dot-matrix printer. Special document needed for finest results. Cannot produce duplicate duplicates while printing peak copy.
14 These work in a similar method to photocopiers. A laser beam is used to produce an electric charge which attracts one-of-a-kind black dust come it. The dust is then moved to the document to create the printed output. Laser printers space faster and also quieter 보다 ink-jet printers and also produce a an extremely high quality print. They are also fairly expensive.
15 A scanner deserve to be supplied to input pictures and also text right into a computer. There space two main varieties of scanner; Hand-held and Flat-bed.
16 A scanner is provided to input pictures or text. If a picture is being input, the scanner will transform it to an image made increase of a large number that dots – typically 300 dots per inch. The variety of dots per customs is a measure up of the scanner’s resolution. An ext dots per inch way a higher resolution or much better quality images. However, the also way that the size of the picture document will it is in larger.
17 Hand-held scanners are small devices the are relocated by hand throughout the document being scanned. castle are small and cheap however there are problems when scanning larger images since several scans will be essential to cover the whole page. The individual scans then have to be ‘stitched together’ through software.
18 Advantages: an excellent for keying pictures and also line art. an excellent for inputting huge amounts of message using OCR. Disadvantages: files can it is in large, an especially if high resolution color is used. Text can be incorrect. Some personalities like zero and the letter O can be confused. Flatbed scanner has a big footprint.
19 Flat-bed scanners look comparable to photocopier machine. It consists of a crate containing a glass key on its top and a lid the covers the glass plate.This glass plate generally used because that placing the document to it is in scanned. because that scanning,an A4 size paper takes around 20 seconds.
20 this scanners are qualified of scanning black and white and colour images. The flat bed scanners are larger in size and more expensive 보다 the hand organized scanner.
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They typically produce much better quality images.