Computer Graphics Unit 1 Quiz

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Questions and Answers

What is a primary application of computer graphics in the field of entertainment?

Medical imaging

Creating motion pictures (correct)

Simplifying financial data

Designing buildings

Which method listed does not use specific criteria for producing colors?

Image Processing

Computer Aided Drawing

Beam Penetration method

Shadow Mask Method (correct)

How are training modules typically created using computer graphics?

Through statistical data analysis

By designing complex algorithms

Using simulators for better understanding (correct)

Through linear programming models

What is a benefit of using computer graphics in education?

Generates interest through models Signup and view all the answers

In which application does computer graphics aid the visualization of data for professionals?

Data summarization Signup and view all the answers

What does the term 'pixel' stand for?

Picture Element Signup and view all the answers

What is a megapixel equivalent to?

1,000,000 pixels Signup and view all the answers

What unit is used to describe the sharpness of a screen image?

PPI Signup and view all the answers

Which pixel measurement is specific to digital images displayed on a screen?

PPI Signup and view all the answers

What does the 'p' in 1080p refer to?

Progressive Signup and view all the answers

Which aspect of a pixel is dependent on the size of the electron beam in CRT monitors?

Size of the pixel Signup and view all the answers

What initiates the process of image display in a CRT?

The emission of a beam of electrons from the electron gun Signup and view all the answers

In a Raster Scan Display, the initial position of the electron beam is at which part of the screen?

Top left corner Signup and view all the answers

Which of the following correctly describes the pixel count in a frame described as 1080p?

1,920 × 1,080 Signup and view all the answers

What is the primary difference between PPI and DPI?

PPI measures screen images while DPI measures printed images. Signup and view all the answers

What is the term used for the movement of the electron beam to the leftmost position after completing a row scan?

Horizontal retrace Signup and view all the answers

What happens to the phosphor material when struck by the electron beam?

It glows briefly and then fades Signup and view all the answers

How is the refresh rate of a screen defined?

The number of times the screen image is refreshed per second Signup and view all the answers

Which aspect does NOT affect the frequency and intensity of the light emitted from the phosphor material?

Length of the electron beam path Signup and view all the answers

What is stored in the frame buffer of a Raster Scan Display?

The complete screen image for redrawing Signup and view all the answers

What is the purpose of refreshing the image on the screen?

To prevent the image from becoming unstable and fading Signup and view all the answers

What does image resolution specifically refer to?

The pixel spacing and total pixels in an image's height and width Signup and view all the answers

What is a characteristic of a screen with a resolution of 3840 x 2160?

It can display 2160 pixels vertically and 3840 pixels horizontally Signup and view all the answers

How is dot pitch defined?

The distance between adjacent sets of primary color dots Signup and view all the answers

Which statement about pixel pitch is correct?

Pixel pitch is the distance between two adjacent pixels of the same color Signup and view all the answers

What is represented by an aspect ratio of 16:9?

The image width is 16 units and the height is 9 units Signup and view all the answers

What effect does a smaller dot pitch have on a display?

It enhances resolution and sharpness Signup and view all the answers

In the context of image resolution, what does a resolution of 800 x 600 indicate?

This is a resolution representing 800 rows and 600 columns of pixels Signup and view all the answers

What is the purpose of a triad of red, green, and blue dots on a monitor?

To display colors as a mixture perceived by the eye Signup and view all the answers

What is the primary factor that determines the Refresh Rate in display technology?

The number of lines to be displayed Signup and view all the answers

Which method allows a CRT monitor to produce only four colors?

Beam Penetration Method Signup and view all the answers

What is a disadvantage of the Beam Penetration Method?

Limited to four colors Signup and view all the answers

What characteristic distinguishes a color CRT monitor from a standard CRT monitor?

Combination of primary colors Signup and view all the answers

Which of the following is NOT an advantage of the Beam Penetration Method?

Produces realistic views Signup and view all the answers

Which technology is associated with producing millions of colors in a CRT monitor?

Combination of Red, Green, and Blue Signup and view all the answers

What factor contributes to the poor picture quality of the Beam Penetration Method?

Limited color production Signup and view all the answers

How does the Shadow-Mask Method differ from the Beam Penetration Method?

It uses a raster scan technology Signup and view all the answers

Study Notes

Basic Elements of Computer Graphics

Pixel, derived from "Picture Element," is the smallest unit of a digital image on displays like LCD or CRT.
Images consist of thousands to millions of pixels, forming a compact grid viewed as a whole.
Each pixel has specific color and brightness values, which combine to create the final image appearance.

Megapixel

A megapixel equals one million pixels, often used to measure digital camera resolution and display quality.
The resolution of images can be calculated by multiplying width by height in pixels.
Example: A 1080p video resolution translates to 1920 × 1080 pixel count, totaling 2,073,600 pixels or approximately 2MP.

PPI and DPI

PPI (Pixels Per Inch) measures pixel density on a digital display, while DPI (Dots Per Inch) measures printed dots in physical images.
PPI reflects image quality on-screen; DPI is relevant for print quality.

Resolution

Resolution refers to the pixel count on display screens, with two types: Image Resolution and Screen Resolution.
Image Resolution pertains to pixel spacing within an image; for instance, an 800 x 600 resolution means 480,000 pixels total.
Screen Resolution indicates the total pixel count on a display; a 3840 x 2160 (4K UHD) resolution has 8,294,400 pixels.

Dot Pitch

Dot pitch is the distance between adjacent dots of the same color on a screen, influencing sharpness and resolution.
Typical dot pitch ranges from 0.25 mm to 0.40 mm; smaller dot pitch yields higher clarity.

Aspect Ratio

Aspect ratio represents the relationship between pixel width (X) and height (Y) in the format X:Y, defining image proportions.

Raster Scan Display

Employs a CRT or LCD with a phosphor-coated surface and uses electron beams to create images by scanning across the display.
The process includes Horizontal Retrace (returning to leftmost position) and Vertical Retrace (moving to start of the next frame).

Refresh Rate

Refresh Rate measures how often a screen redraws; an unstable image results from the brief glow time of phosphors after being struck by an electron beam.
Typically, refresh rates are set between 30 to 60 Hz.

Color CRT Monitor

Combines primary colors—red, green, and blue—to produce a wide color spectrum.
Techniques include:
- Beam Penetration Method: Uses electron beam penetration to excite different phosphors, resulting in limited color production (four colors only).
- Shadow-Mask Method: Enables more color accuracy on raster scan monitors without the depth criteria of beam penetration.

Applications of Computer Graphics

Computer Art: Utilizes graphics for creating artwork, logos, and cartoons.
Computer Aided Drawing: Facilitates design in architecture, vehicles, and aircraft.
Presentation Graphics: Summarizes data visually for reports using charts and graphs.
Entertainment: Vital for animations in movies, video games, and television shows.
Education: Enhances learning through interactive educational models.
Training: Employs simulators for efficient skill development.
Visualization: Aids professionals in interpreting large data sets across various industries.
Image Processing: Enhances existing images for better clarity and understanding.
Medical Imaging: Non-invasive technologies like MRIs and CAT scans for internal examination.

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Description

This quiz covers the basic elements of computer graphics, including its applications and hardware architecture. It also delves into the concept of pixels and their significance in image display on various monitors. Test your understanding of these foundational concepts in computer graphics.