classification of computer graphics

 classification of computer graphics

Introduction to Computer Graphics

The computer is an information processing machine. It is a tool for storing, manipulating

and correlating data. There are many ways to communicate the processed information to the

user. The computer graphics is one of the most effective and commonly used ways to

communicate the processed information to the user. It displays the information in the form of

graphics objects such as pictures, charts, graphs and diagrams instead of simple text. Thus we

can say that computer graphics makes it possible to express data in pictorial form. The picture

or graphics object may be an engineering drawing, business graphs, architectural structures, a

single frame from an animated movie or a machine parts illustrated for a service manual.

In computer graphics, pictures or graphics objects are presented as a collection of

discrete picture elements called pixels. The pixel is the smallest addressable screen element. It

is the smallest piece of the display screen which we can control. The control is achieved by

setting the intensity and color of the pixel which compose the screen.

Each pixel on the graphics display does not represent mathematical point. Rather, it

represents a region which theoretically can contain an infinite number of points. For example, if

we want to display point P₁ whose co-ordinates are (4.4,3.8) and point P₂ whose co-ordinates

are (4.7,3.3) then P₁ and P₂ are represented by only one pixel (4,3), as shown in the figure below 

Classification of computer graphics

In the last section we have seen various uses of computer graphics. These uses

can be classified as shown in the fig. below. As shown in fig. below, the use of computer

graphics can classified according to dimensionality of the object to be drawn: 2D or 3D.

It can also be classified according to kind of picture: symbolic or Realistic. Many

computer graphics application are classified by the type of interaction. The type of

interaction determines the user’s degree of control over the object and its image.

Incontrollable interaction user can change the attributes of the images. Role of picture 

gives the another classification. Computer graphics is either used for representation or it

can be an end product such as drawings. Pictorial representation gives the final

classification of used computer graphics. It classifies the use of computer graphics to

represent pictures such as line drawing, black and white, color and so on. 

 classification of computer graphics