Graphics systems contain
five main content areas: hardware, software, data, applications and people.
10.1 Hardware
Input devices are
keyboard, mouse, digitiser, scanner, graphics tablet and light pen. Output
devices are monitor, printer and plotter.
Most monitors are
Cathode Ray Tubes. **Sketch Fig 10.3 p193** The electron beam zig zags across
the screen in a raster scan. This has to be done regularly to maintain the
image; it is called refreshing.
Write
out the sentence and fill in the missing word
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A graphic is a ????? such as a drawing, painting, diagram,
photograph, or chart. |
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Systems that
produce ????? are called graphics systems. |
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Graphics systems
need large amounts of ????? and fast processing power. |
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A trackball is an
intput device that is similar to a ?????, except that the ball is on
top of the device. |
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A ????? is a digitiser that works by shining a strip
of light on to a page and measuring the reflected light with light scanners. |
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A graphics tablet is
an input device that consists of a special electronic pad and a pen called a ?????. |
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A cathode ray tube
(CRT) produces images by firing a beam of ?????
on to the inside of the screen. |
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Non-interlaced
monitors ????? the screen by scanning every
line at up to 72 times every second. |
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Laser printers use
a page description language such as ?????. |
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A ????? is an output device that uses coloured ink
pens to draw maps, charts, diagrams and other drawings on paper. |