What is computer graphics?

What is computer graphics?

The computer is an information processing machine. It is a tool for
storing, manipulating and correlating data. The computer graphics is one of the
most effective and commonly used ways to communicate the processed information
to the user, Computer graphics is the field of computer science in which we are
interested in generating objects and images such as pictures, charts, graphs
and diagrams using pixels. It started with elementary programs like point, line
and circle generation. But with the development of interactive input and output
devices it is possible virtually to design anything on the computer system. Multimedia, CAD and CAM have all been possible because of
computer graphics.

How pictures or graphics objects are presented in computer graphics?

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 Pı whose coordinates are (4.2, 3.8)
and point P

_{2}whose coordinates are (4.8, 3.1) then Pı and P_{2 }are represented by only one pixel (4, 3) as shown in the figure. In general, a point is represented by the integer part of x and integer part of y, i.e., pixel (int(x), int(y)).
The special procedures determine which pixel will provide the best
approximation to the desired picture or graphics object. The process of determining
the appropriate pixels for representing picture or graphics object is known as
rasterization, and the process of representing continuous picture or graphics
object as a collection of discrete pixels is called scan conversion.

The computer graphics allows rotation, translation, scaling and
performing various projections on the picture before displaying it. It also
allows adding effects such as hidden surface removal, shading or transparency
to the picture before final presentation.

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