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Questions and Answers
Computer graphics is the art of drawing lines using computers without the help of programming and tools.
False
A computer graphics image is made up of numerous pixels.
True
Computer graphics provides tools for producing only real-world objects and not synthetic objects.
False
One of the applications of computer graphics is plotting graphs and charts.
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In computer graphics, objects are presented as a collection of continuous lines.
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Computer graphics allows control over the intensity and color of pixels to determine the appearance of an image.
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Rasterization is the process of representing continuous pictures or graphics objects as a collection of discrete pixels.
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Random scan display has a better resolution compared to raster scan display.
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Color CRT monitors use only the beam-penetration technique for color display.
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Flat panel displays have reduced volume, weight, and power requirements compared to CRT monitors.
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Emissive displays convert electrical energy into light, while non-emissive displays use optical effects to display graphics patterns.
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Liquid Crystal Displays (LCDs) fall under the category of emissive displays.
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Study Notes
What is Computer Graphics?
- Computer graphics is the art of drawing lines, charts, pictures, etc. using computers with the help of programming and tools.
- A computer graphics image is made up of a number of pixels, with each pixel being the smallest addressable graphical unit represented on the computer screen.
Advantages of Computer Graphics
- Computer graphics is one of the most effective and commonly used ways of communication with computers.
- It provides tools for producing pictures of "real-world" and synthetic objects, such as mathematical surfaces in 4D and data that have no inherent geometry.
- It allows for the production of animations and the ability to move objects and observers as per requirement.
Applications of Computer Graphics
- User interface (e.g., app icons)
- Simulation and animation (e.g., cartoon films)
- Plotting of graphs and charts (e.g., stock exchange)
- Computer-aided drafting and design (e.g., automobile parts designing)
- Art and commerce (e.g., creative pictures)
- Cartography (e.g., geographic maps)
- Education and training (e.g., models of physics)
- Image processing (e.g., editing photos)
Basics of Computer Graphics
- In computer graphics, pictures or graphics objects are presented as a collection of discrete pixels.
- The intensity and color of each pixel can be controlled to decide how the picture looks like.
- The process of representing continuous pictures or graphics objects as a collection of discrete pixels is called Scan Conversion.
Display Devices
- Display devices are also known as output devices.
- Examples of display devices include:
- Cathode Ray Tube (CRT)
- Direct-View Storage Tubes (DVST)
- Plasma Panels displays
- Thin Film Electroluminescent Displays
- Light Emitting Diode (LED)
- Liquid Crystal Display (LCD)
- Three-dimensional viewing devices
- Stereoscopic system
- Virtual-reality
Cathode-Ray-Tubes (CRT)
- There are two techniques used for producing images on the CRT screen:
- Vector scan/Random scan display
- Raster scan display
Random Scan v/s Raster Scan
- Random Scan System:
- The electron beam is directed only to the parts of the screen where a picture is to be drawn.
- Its resolution is good.
- Raster Scan System:
- The electron beam is swept across the screen, one row at a time, from top to bottom.
- Its resolution is poor.
Color CRT Monitors
- There are two basic techniques for color display:
- Beam-penetration technique
- Shadow-mask technique
Flat Panel Display
- Flat panel displays have reduced volume, weight, and power requirement compared to CRT.
- They can be categorized into two types:
- Emissive displays (e.g., plasma panels, thin film electroluminescent displays, and light emitting diodes)
- Non-emissive displays (e.g., LCD)
Emissive Displays
- Examples include:
- Plasma Panels displays
- Thin Film Electroluminescent Displays
- Light Emitting Diode (LED)
Non-Emissive Displays
- Examples include:
- Liquid Crystal Display (LCD)
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Description
Learn about computer graphics, the art of creating images using computers and programming tools. Explore the concept of pixels and the advantages of using computer graphics for communication and creating visual content.
