Computer in Use. Маркушевская Л.П - 54 стр.

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Университет ИТМО | Санкт-Петербург

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54
have been developed as well; special programs send digital data from the computer's
memory to film recorder, which records the image sequence on video film. The
computer can also generate hard copy by means of plotters and laser or dot-matrix
printers.
Pictures are stored and processed in a computer's memory by either of two
methods: raster graphics and vector graphics. Raster-type graphics maintain an image
as a matrix of independently controlled dots, while vector graphics maintain it as a
collection of points, lines, and arcs. Raster graphics are now the dominant computer
graphics technology.
Raster graphics create uniform colored areas and distinct patterns and allow precise
manipulation. Raster graphics emerged in the early 1970s and had largely displaced
vector systems by the 90s.
Vector-graphics technology was developed in the mid-1960s and had been
widely used until it was supplanted by raster graphics. Its application is now largely
restricted to highly linear work in computer-aided design and architectural drafting,
and even this is performed on raster-type screen with the vector-type screens with the
vectors converted into dots.
Computer graphics has found widespread use in printing, product design and
manufacturing, scientific research, and entertainment since 1960s.
Notes:
- to sweep –сканировать
- raster graphics – растерная графика
- vector graphics – векторная графика
COMPEHENSION CHECK
Exercise 1. Answer the questions.
1. What does computer graphics system consist of?
2. What a graphics software package is?
3. How do electrons influence the formation of images on a graphic display
screen?
4. What devices help users to receive needed images on a display screen?
5. What are two methods to store and process pictures in a computer memory?
Exercise 2. Complete sentences with the collocations below.
1. The images produced on a computer screen can be printed documents or ….
2. The portion of the display screen … by an electron beam.
3. The brightness of the … fades quickly.
4. Computer graphics has found a … in different spheres of human activities
since 1960s.
5. Vector graphics were supplanted by ….

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