computer graphics viva questions and answers pdf
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Question 1. What is computer graphics?


Answer- The term computer graphics includes almost everything in the computer that is not text or sound. It is an art of drawing pictures, lines. Graphics, etc. Using computers with the help of programming. Or we can say that graphics are the representation and manipulation of computer image data with the help of specialized software and hardware. The graphic design is made using the different software available for computers that can produce 3D images in the required form and size. Computer graphics help us get real viewing experiences.

Question 2. Write the important applications of the computer graphic?

Answer- Below are the applications of the computer graphics
1. Computer graphics are used in the field of computer aided design.
2. Used to produce illustrations for reports or to generate slides with projections.
3. Computer graphic methods are widely used in both fine and commercial applications.
4. The artist uses a combination of 3D modeling packages, texture mapping, drawing programs and CAD software.
5. In the field of CG entertainment methods are now commonly used in making motion pictures. Music videos and TV shows.
6. Computer-generated models of physical, financial and economic systems are often used as educational aids.

Question-3 What are raster and vector graphics?

Answer- Raster and Vector graphics can be explained as-
RASTER - In the computer graphics image, or BITMAP, it is a dot matrix data structure that represents a generally rectangular grid of pixels or dots of color, visible through a monitor, paper or other presentation medium. The Raster image is stored in image files with different formats.

VECTOR- Vector graphics are the use of geometric primitives such as points, lines, curves and forms or polygons, which are based on mathematical expressions, to represent the image in computer graphics. "Vector", in this context, implies more than one straight line.

Question-4 Write the difference between the vector and the plot of the plot?

Answer-Below are the differences between vector and raster-
1. Raster or bitmap images are resolution dependent because it is not possible to increase or decrease their size without sacrificing image quality.
While vector-based image does not depend on resolution. The size of the vector image image can be increased or decreased without affecting the quality of the image.
2. Bitmap or bitmap images are always rectangular in shape, however, the vector image can have any shape.
3. Unlike the raster image, the vector image can not be used for realistic images. This is because vector images consist of solid color areas and mathematical gradients, so they can not be used to display continuous color tones in a natural photograph.

Question-5 What is scaling in computer graphics?

Answer: In the computer graphic, the image scale is the process of resizing a digital image. Scaling is a non-trivial process that involves an exchange between efficiency, smoothness and sharpness. With bitmap graphics, as the size of an image is reduced or enlarged, the pixels that make up the image become more and more visible, making the image appear "smooth" if the pixels are averaged or not .

Question-6 What are the hardware devices used for computer graphics?

Answer - Hardware devices used for computer graphics are-
Input Devices
Keyboard, mouse, data tablet, scanner, stylus, touchscreen, joystick
Output devices
Raster Devices- CRT, LCD, LED, Plasma Screens, Printers
Vector Devices - Plotters, Oscilloscopes

Question-7 What are the characteristics of inkjet printers?

Answer - Features of inkjet printers are-
1. They can print from 2 to 4 pages per minute.
2. the resolution is approximately 360dpi.i. This achieves better print quality.
3. The cost of operation is very low. The only part that requires replacement is the ink cartridge.
4. Four cyan, yellow, magenta, black colors are available.

Question-8 What are the advantages of electrostatic tracers?

Answer- The following are the advantages of electrostatic tracers:
1. They are faster than pen tracer and very high quality printers.
2. Recent electrostatic tracers include a scan conversion capability.
3. Electrostatic color plotters are available. They make multiple passes on the paper to trace the image in color.

Question-9 What is meant by scan code?

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

Question-10 Define Random and Raster Analysis Screens?

Answer - Random scanning is a method in which the display is performed by electronic beam, which is directed only at the points or parts of the screen where the image is to be drawn.
The raster scanning system is a scanning technique in which electron sweeps from top to bottom and from left to right. The intensity is turned on or off to illuminate and de-energize the pixel.

[Image: thumb535-Vector-Scan-vs-Raster-Scan-Disp...00x259.jpg]
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