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Questions and Answers
What is the standard aspect ratio for PCs?
What is the standard aspect ratio for PCs?
- 4:3 (correct)
- 3:2
- 5:4
- 16:9
Which display resolution corresponds to the aspect ratio of 5:4?
Which display resolution corresponds to the aspect ratio of 5:4?
- 1920 × 1080
- 640 × 480
- 1024 × 768
- 1280 × 1024 (correct)
What is the main purpose of display technology?
What is the main purpose of display technology?
- To manage data storage
- To display information visually (correct)
- To connect multiple devices
- To enhance data processing speed
Which component of the Cathode Ray Tube is primarily responsible for emitting electrons?
Which component of the Cathode Ray Tube is primarily responsible for emitting electrons?
What does the Focusing system in a CRT do?
What does the Focusing system in a CRT do?
Which of the following is NOT a type of display device mentioned?
Which of the following is NOT a type of display device mentioned?
What function do the Horizontal and Vertical Deflection Plates serve in a CRT?
What function do the Horizontal and Vertical Deflection Plates serve in a CRT?
Which of the following resolutions supports the 16:9 aspect ratio?
Which of the following resolutions supports the 16:9 aspect ratio?
What is the full form of the term 'PIXEL'?
What is the full form of the term 'PIXEL'?
What determines the number of megapixels in an image?
What determines the number of megapixels in an image?
How many pixels are there in one megapixel?
How many pixels are there in one megapixel?
What does PPI measure in digital images?
What does PPI measure in digital images?
Which of the following statements is true regarding DPI?
Which of the following statements is true regarding DPI?
Which pixel structure feature is essential for the perception of images?
Which pixel structure feature is essential for the perception of images?
In the context of video resolution, what does 1080p indicate?
In the context of video resolution, what does 1080p indicate?
What is the primary distinction between PPI and DPI?
What is the primary distinction between PPI and DPI?
What initiates the operation of a CRT display?
What initiates the operation of a CRT display?
How does the electron beam produce an image on the screen?
How does the electron beam produce an image on the screen?
What is the primary factor that determines the amount of memory required for a frame buffer?
What is the primary factor that determines the amount of memory required for a frame buffer?
What is the purpose of the frame buffer in a raster scan display?
What is the purpose of the frame buffer in a raster scan display?
What happens during the horizontal retrace in a raster scan display?
What happens during the horizontal retrace in a raster scan display?
In which type of display does the electron beam draw one row of the screen at a time?
In which type of display does the electron beam draw one row of the screen at a time?
What does a higher refresh rate indicate?
What does a higher refresh rate indicate?
Which statement is true regarding the resolution of Raster Scan Displays compared to Random Scan Displays?
Which statement is true regarding the resolution of Raster Scan Displays compared to Random Scan Displays?
What is the refresh rate commonly associated with Raster Scan Displays?
What is the refresh rate commonly associated with Raster Scan Displays?
What is the effect of the phosphor material fading after being struck by the electron beam?
What is the effect of the phosphor material fading after being struck by the electron beam?
Which of the following is the correct formula to calculate the memory required for a frame buffer?
Which of the following is the correct formula to calculate the memory required for a frame buffer?
Which of the following best describes the raster scan process?
Which of the following best describes the raster scan process?
What type of memory area does a Random Scan Display use to store picture definitions?
What type of memory area does a Random Scan Display use to store picture definitions?
Which characteristic of the phosphor material impacts the screen's image quality?
Which characteristic of the phosphor material impacts the screen's image quality?
Which of the following statements accurately describes a characteristic of Random Scan Displays?
Which of the following statements accurately describes a characteristic of Random Scan Displays?
Which type of scan display uses an electron beam directed to the entire screen?
Which type of scan display uses an electron beam directed to the entire screen?
What is one key component of a shadow mask CRT?
What is one key component of a shadow mask CRT?
How many different electron guns are used in a shadow mask CRT?
How many different electron guns are used in a shadow mask CRT?
Which method can produce millions of colors?
Which method can produce millions of colors?
What is a disadvantage of the beam penetration method compared to the shadow mask method?
What is a disadvantage of the beam penetration method compared to the shadow mask method?
How does a shadow mask affect picture quality?
How does a shadow mask affect picture quality?
In relation to cost, how does the beam penetration method compare to the shadow mask method?
In relation to cost, how does the beam penetration method compare to the shadow mask method?
Which aspect of color representation is more limited in the beam penetration method?
Which aspect of color representation is more limited in the beam penetration method?
What is a characteristic of the resolution provided by the shadow mask method?
What is a characteristic of the resolution provided by the shadow mask method?
Study Notes
Basic Elements of Computer Graphics
- Computer graphics encompass visual representation of data through images and animations.
- Applications include computer-aided design (CAD), medical imaging, video games, and simulations.
Pixel
- Pixel (Picture Element) is the smallest unit of a digital image.
- Each pixel holds specific color and brightness values, forming a grid when combined.
- The resolution of digital displays is defined by the number of pixels.
Megapixel
- One megapixel (MP) equals one million pixels.
- Often used to describe camera resolution and digital display quality.
- To calculate total pixels in an image: width × height (e.g., 1920 × 1080 = 2,073,600 pixels).
PPI and DPI
- PPI (Pixels Per Inch) measures digital image sharpness on screens.
- DPI (Dots Per Inch) measures printed image quality.
- PPI indicates display quality, while DPI refers to printing ink dots.
Display Devices in Computer Graphics
- Output devices represent visual information, known as Video Display Units (VDU).
- Rising demand for high-quality displays drives technology development.
Types of Display Devices
- Cathode Ray Tube (CRT)
- Color CRT Monitor
- Liquid Crystal Display (LCD)
- Light Emitting Diode (LED)
- Direct View Storage Tubes (DVST)
- Plasma Display
- 3D Display
Cathode Ray Tube (CRT)
- CRT technology was common in older monitors and televisions.
- Works by generating images using electron beams focused on phosphor-coated screens.
- Essential components: Electron Gun, Control Electrode, Focusing System, Horizontal & Vertical Deflection Plates.
Raster Scan Display
- Uses CRT or LCD to display images by scanning from top to bottom.
- Employs arrays of phosphor dots emitting light when hit by electrons.
- Refresh Rate is crucial to stabilize images—monitors refresh multiple times per second via Horizontal and Vertical Retrace.
Frame Buffer
- A dedicated memory area that stores intensity values of displayed images.
- Memory requirement is calculated based on resolution and color depth.
Random Scan Display
- Electron beam directs to specific screen points to create images by drawing lines.
- High resolution achieved by storing images as line-drawing commands.
Comparison: Raster Scan vs. Random Scan Display
- Raster Scan: Electron beams from top to bottom, less resolution and cost-effective.
- Random Scan: Directs the beam where needed, providing high resolution but at a higher cost.
Shadow Mask Technology
- Used in CRT displays, allows for color representation using three electron guns (red, green, blue).
- Activates specific color dots on-screen through directed beams.
- Offers high image realism and a broader range of colors compared to beam penetration methods.
Beam Penetration vs. Shadow Mask
- Beam Penetration: Suitable for Random Scan; cheaper but limited to fewer colors and poorer image quality.
- Shadow Mask: More expensive; provides millions of colors and high-quality images with realistic effects.
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Description
This quiz covers the basic elements and applications of computer graphics, including the architecture of display devices and input/output technologies. Test your knowledge on pixels and how they function in the realm of computer graphics.
