In this fast-forwarding area of technology, the main aim of all mobile 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 are being used in our smartphones too. We mostly hear that the graphic is not supportive or is insufficient, but most people do not know the details about the graphics. So here we are going to discuss some important computer graphics questions. These questions are also very important for the students who are reading computer graphics subjects in their course.
Computer Graphics Important Questions
Here are some important questions and answers of computer graphics, which are mostly included in all types of graphics examinations.
Question 1. What is computer graphics?
Answer- The term “computer graphics” includes everything on a computer that is not text or sound. It is the 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 a computer screen.
Question 2. Write the important applications of computer graphics.
Answer: Following are the applications of computer graphics.
- Computer graphics is used in the field of computer design.
- It is used to produce test pics for reports or to generate slides for projections.
- Computer graphics are 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 computers, graphic methods are now commonly used in making motion pictures. music videos and television shows, 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 corresponding to the key pressed into a part of the memory called 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 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 number.
VECTOR—A vector graphic is a type of image. Vector images are graphical representations of mathematical objects such as lines, curves, and polygons. These graphics are generated by computer, and they follow the x- and y-axes as their reference definition.
The quality of vector graphics remains the same on the big and small sizes of the image, but in raster graphics, quality decreases when we increase the size of an image.
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 pixels, and image quality will decrease while we increase the size of the raster.
- While vector-based graphics are not dependent on resolution. The size of the vector image can be increased or decreased without affecting picture quality. 2. Raster 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, and that is why quality will be changed with travailing. In the raster image, as the image’s size increases, the image’s quality will decrease.
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, etc.
Output Devices: These devices are used to get output from the computer, such as raster devices (CRT, LCD, LED, and plasma screens) and printers and vector devices (plotters and 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.
- The resolution is about 360 d.p.i., therefore producing better quality.
- The part that requires replacement is the ink cartridge, so the operating cost is low.
- Four colors—cyan, yellow, magenta, and 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 produce 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 carried 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 sweeps from top to bottom and from left to right. The intensity is turned on or off to light and unlight the pixel.