Computer Graphics

Computer graphics/CG are any drawing/image/media, usually movies and pictures that are created on the computer screen through the use of hardware and software. Computer graphics are often referred to as computer-generated anything. An example of a computer graphic is given in this picture.Computer Graphics 

Why Computer Graphics is Important

Some key points are given below to understand the importance of the basics of Computer Graphics. This is a basic overview of Computer graphics study important.

  • Understanding information: Visualization is the basics for dealing with complex data.
  • Improved communication with computers: Graphical and audio interfaces are helpful to understand anything in groups.
  • Better product designs: Designers can explore more things in less time with the help of computer graphics.
  • More economical designs: Design databases can be tested electronically, reducing dependence on the complex.
  • Better Manufacturing: Design databases can be transmitted to robots for manufacturing.

Uses Of  Computer Graphics Technology

  • To Develop User Interfaces
  • Use In Hypermedia
  • Use In Presentation Graphics
  • Electronic Publication
  • Office Automation
  • Computer-Aided Design
    • Architecture
    • Engineering (VLSI, complex machinery)
  • Visualization
    • It is Used In Chemical Analyses
    • Use In Demographic Studies
    • Use In Financial Planning
    • Use In Cartography
    • Use In Particle Behavior
    • Use In Medical (ultrasound, CT Scan, MRI, PET)
    • Use In Meteorological Studies
    • Use In Photograph Enhancement
  • Education
    • Tutorial Software and Book Writing
  • Process Control
    • It Is Used In Computer networks, Monitoring of power plants, airplane traffic, tornados Traffic Signals Electricity.
  • Entertainment
    • Feature Films and Dramas
    • Animated Programs In multiple Adventure
    • Virtual Reality (functions and etc)
    • Console, Arcade, PC Games
  • Simulation
    • Flight Simulators
    • Factory Simulation
  • Graphic Arts
    • Video painting, etc.

Subfields of Computer Graphics

According to many experts, there are eight fundamental areas of computer graphics. These are discussion able.

Mathematical Structures
Spaces, points, vectors; dust, curves, surfaces, solids.
Description of objects and their attributes, including:
  • Primitives (e.g. pixels, polygons)
  • Intrinsic Geometry
  • Attributes (color, texture)
  • Connectivity (scene graphs)
  • Dynamics (motion, morphing)

Techniques for object modeling, including:

  • Polygon meshes
  • Patches
  • Solid Geometry
  • Fractals
  • Sweeps
  • L-grammars
  • Particle systems
User Interfaces
Human interfaces, input-output devices, color theory, workstations, interactive techniques, dialog design, animation.
Graphics Software
Graphics APIs; paint, CAD, draw and animation software; modeling and image databases.
Graphics Hardware
Input output devices, specialized graphics card for specialized architectures.
Abstract to device coordinate transformations, the synthetic camera, windows, viewports, clipping and etc.
Realism, physical modeling, ray tracing, radiosity, visible surface determination, transparency, translucency, refraction, reflection, shading, shadows, surface and texture mapping, etc.
Image Processing
Image description, storage, transformations, filtering, enhancement, pattern recognition, edge detection, object reconstruction.


important questions on computer graphics


In this fast-forwarding area of technology, the main aim of all mobiles phone and computer companies is high-resolution graphics. The demand of users for crystal clear graphics with high visibility is increasing. Now the advanced graphics being used in our smartphones too. We mostly hear that the graphic is not supporting or insufficient, but most people do not know the details about the graphics. So here we are going to discuss some Computer graphics important questions. These questions are also very important for the students who are reading computer graphics subjects in their course.

Question 1. What is computer graphics?
Answer- The term computer graphics include everything on a computer that is not text or sound. It is an art of drawing pictures, lines. charts, images, etc. We draw these all by using computers with the help of programming. Graphic designing is done by using various software for computers which can produce 3-D images in the required shape and dimension. Computer graphics help us in getting a display on computer screen.

Question 2. Write the important applications of computer graphics?
Answer- Following are the applications of computer graphic

  • Computer Graphics is used in the field of computer design.
  • It is used to produce test pics for reports or to generate slides for with projections.
  • Computer graphic is widely used in both fine arts and commercial applications.
  • The artists use a combination of 3-D modeling packages, texture mapping, drawing programs, and CAD software.
  • In the field of entertainment computer, graphic methods are now commonly used in making motion pictures. music videos and television shows and etc.
  • Computer-generated models of physical, financial and economic systems are mostly used as educational fields.

3. What is meant by the scan code?

When a key is pressed on the keyboard, the keyboard controller places a code carry to the key pressed into a part of the memory called as the keyboard buffer. This code is called the scan code.

4. What is meant by the refreshing of the screen?

Some method is needed for maintaining the picture on the screen. Refreshing of the screen is done by keeping the phosphorus glowing to redraw the picture repeatedly. (i.e.) By quickly directing the electronic beam back to the same points.

Question-5 What are the raster and vector graphics?

Answer- The Raster and Vector graphics can be defined as-
RASTER- In computer graphics  raster graphics or bitmap graphics, are digital images that are composed of tiny rectangular pixels. Almost all types of images on the computer screen are raster graphics.

The file size of a raster image depends on the size of the image, and the number of pixels being used in the image. This means that an image with a 1280×720 resolution will contain 921,600 pixels while a full HD 1920×1080 image will have 2,073,600 pixels in numbers.

VECTOR- A vector graphic is a type of image. Vector images are graphical representations of mathematical objects such as lines, curves, polygons. These graphics are generated by computer and they follow x and y-axis as their reference definition.

The Quality of Vector graphics remain the same on the big and small size of the image but in raster graphics quality decrease when we increase the size of an image.

vector raster graphics

Question-6 Write the difference between vector and raster graphics? Answer-Following are the differences between vector and raster graphics-

  •  Raster or Bitmap images are made of rectangular pixel and image quality will decrease while we increase the size of raster size.
  • While vector-based graphics are not dependent on resolution. The size of the vector image can be increased or decreased without affecting picture quality.2Raster or bitmap images are always rectangular in shape and vector graphics can have any shape.
  • A raster image is a realistic image but the Vector image is not a realistic image.

Question-7 What is scaling in computer graphics?
Answer- In computer graphics, image scaling is the process of resizing an image presented on screen. Scaling is a non-trivial process that is way quality will be changed with travailing. In the raster image as the size of the image increase, the quality of the image will be decreased.

Question-8 What are the hardware devices used for computer graphics?
Answer- The hardware devices used for the computer graphics are given below
Input Devices: These devices are used to get input for the computer such as
Keyboard, Mouse, Scanner, Light pen, Touch screen, Joystick, cam and etc.
Output Devices: These devices are used to get output from the computer such as Raster Devices- CRT, LCD, LED, Plasma screens, Printers Vector Devices- Plotters, Oscilloscopes.


Question-9 What are the features of inkjet printers?
Answer-  Some features of inkjet printers are as follows:

  • They can print 2 to 4 pages per minute.
  • Resolution is about 360d.p.i. Therefor produced better quality.
  • The part that requires replacement is ink cartridge so, Operating cost is low.
  • Four colors cyan, yellow, magenta, black are used.

Question-10 What are the advantages of electrostatic plotters?
Answer- Some advantages of electrostatic plotters are:

  • They are faster than pen plotters and produced very high-quality prints.
  • The most modern electrostatic plotters include a scan conversion capability.
  • Color electrostatic plotters are also available. They make multiple passes over the paper to plot to produce color pictures.

Question-11 What is meant by the scan code?
Answer– As a key is pressed on the keyboard, the keyboard controller places a code carry to the key pressed into the part of the memory called a keyboard buffer. This code is called a scan code.

Question-12 Define Random and Raster scan displays?
Answer– In computer graphics: A random scan is a method in which the display is made by an electronic beam, which is directed only to the points or parts of the screen where the picture is to be drawn.
Raster Scan Display: The Raster scan system is a scanning technique in which the electron sweep from top to bottom and from left to right. The intensity is turned on or off to light and un-light the pixel.

Random Scan and Raster Scan

In computer science, computer graphics are the art of drawing pictures, lines, charts, etc on the computer screen. To display a picture of any size on a computer screen is a very difficult process. It is simplified by using Computer graphics. Graphics on the computer screen are produced by using various techniques and algorithms. in this article we are going to explain interactive and non-interective computer graphics.


Non-Interactive or Passive Computer Graphics:

In non-interactive or passive computer graphics, the picture is produced on the computer screen, and the user does not have any control over the image. In simple wording, the user cannot make any change in an image. Example: screen savers.

In non-interactive computer graphics, users can only see the produced image. The produced image can not be changed by the user. It is one-way-communication between user and computer.

Non Interactive Computer Graphic

Interactive Computer Graphics:

In interactive Computer Graphics, users can make some changes to the produced image. In simple users have some kind of control over the picture. Interactive Computer Graphics require two-way communication between the computer and the user. A User can see the produced image and make a change by sending his command by using the input device.

Interactive Computer Graphics System


  1. Higher Quality resolution
  2. More precise results
  3. Greater Productivity
  4. Lower analysis and design cost
  5. Significantly enhances our ability to understand data.

Working of Interactive Computer Graphics:

The modern graphics display is very simple in construction. It consists of three components:

  1. Frame Buffer or Digital Memory Buffer
  2. A Monitor likes a home T.V.
  3. Display Controller or Video Controller:

Difference between Interactive and non-Interactive Computer Graphics

Interactive Computer Graphics Non-Interactive Computer Graphics 

The image can be changed by the user

It is Two-way communication between user and computer

For example, Almost all computers have interaction with the user.

The image can not be changed by the user

It only on way communication by user and computer

For Example, The familiar example of a non-interactive computer graphic is TV broadcasting.

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