Unit-1 – Basics of Computer Graphics
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Prof. Vijay M. Shekhat, CE Department
| 2160703 – Computer Graphics
What is computer Graphics?
Computer graphics is an art of drawing pictures, lines, charts, etc. using computers with the help of
programming. Computer graphics image is made up of number of pixels. Pixel is the smallest addressable
graphical unit represented on the computer screen.
Introduction
Computer is information processing machine. User needs to communicate with computer and the
computer graphics is one of the most effective and commonly used ways of communication with the
user.
It displays the information in the form of graphical objects such as pictures, charts, diagram and graphs.
Graphical objects convey more information in less time and easily understandable formats for example
statically graph shown in stock exchange.
In computer graphics picture or graphics objects are presented as a collection of discrete pixels.
We can control intensity and color of pixel which decide how picture look like.
The special procedure determines which pixel will provide the best approximation to the desired picture
or graphics object this process is known as Rasterization.
The process of representing continuous picture or graphics object as a collection of discrete pixels is
called Scan Conversion.
Advantages of computer graphics
Computer graphics is one of the most effective and commonly used ways of communication with
computer.
It provides tools for producing picture of “real-world” as well as synthetic objects such as mathematical
surfaces in 4D and of data that have no inherent geometry such as survey result.
It has ability to show moving pictures thus possible to produce animations with computer graphics.
With the use of computer graphics we can control the animation by adjusting the speed, portion of
picture in view the amount of detail shown and so on.
It provides tools called motion dynamics. In which user can move objects as well as observes as per
requirement for example walk throw made by builder to show flat interior and surrounding.
It provides facility called update dynamics. With this we can change the shape color and other properties
of object.
Now in recent development of digital signal processing and audio synthesis chip the interactive graphics
can now provide audio feedback along with the graphical feed backs.
Application of computer graphics
User interface: - Visual object which we observe on screen which communicates with user is one of the
most useful applications of the computer graphics.
Plotting of graphics and chart in industry, business, government and educational organizations drawing
like bars, pie-charts, histogram’s are very useful for quick and good decision making.
Office automation and desktop publishing: - It is used for creation and dissemination of information. It is
used in in-house creation and printing of documents which contains text, tables, graphs and other forms
of drawn or scanned images or picture.
Computer aided drafting and design: - It uses graphics to design components and system such as
automobile bodies structures of building etc.
