Master Raster Graphics: The Foundation of Digital Image Representation

Question 1

In the RGB color model, which color is NOT a primary color?

Accepted Answer

Yellow

Answer

Red

Answer

Green

Answer

Blue

Question 2

What is the hexadecimal code for the color white?

Accepted Answer

#FFFFFF

Answer

#000000

Answer

#FF0000

Answer

#00FF00

Question 3

Which concept measures the distance between two pixels?

Accepted Answer

Pixel pitch

Answer

Pixel density

Answer

Pixel count

Answer

Pixel resolution

Question 4

Which image compression technique involves discarding some image data to reduce file size, resulting in a loss of image quality?

Accepted Answer

JPEG

Answer

LZW

Answer

Huffman encoding

Answer

PNG

Question 5

What is the purpose of using a color palette in raster graphics?

Accepted Answer

To restrict the number of colors used in an image and optimize file size

Answer

To enhance image quality

Answer

To improve image accuracy

Answer

To facilitate color editing

Question 6

Which tool in raster graphics software is used to select a specific region of an image?

Accepted Answer

Lasso

Answer

Magic wand

Answer

Brush

Answer

Eraser

Question 7

What is the process of converting an analog image into a digital representation using pixels called?

Accepted Answer

Rasterization

Answer

Vectorization

Answer

Digitization

Answer

Interpolation

Question 8

A pixel is a fundamental element in raster graphics. It refers to:

Accepted Answer

A single color value in an image

Answer

A group of pixels that form an image

Answer

A measurement of image resolution

Answer

A file format for raster graphics

Question 9

A bitmap image, a fundamental type of raster image, is characterized by its storage format. How is a bitmap image stored?

Accepted Answer

As a grid of binary values representing pixel colors

Answer

As a grid of color values representing pixel colors

Answer

As a vector-based representation using mathematical equations

Answer

As a combination of raster and vector data

Question 10

Dithering, a technique used in raster graphics, involves:

Accepted Answer

Utilizing a limited number of colors to create the illusion of additional colors

Answer

Employing a lossless compression method to reduce file size

Answer

Storing image data in a highly compressed format

Answer

Increasing the resolution of an image

Question 11

Which of the following color models is commonly used for representing RGB images?

Accepted Answer

RGB

Answer

CMYK

Answer

HSV

Answer

YCbCr

Question 12

What is the term for the smallest individual unit of a raster image that can be addressed and manipulated?

Accepted Answer

Pixel

Answer

Voxel

Answer

Vertex

Answer

Polygon

Question 13

Which technique is primarily used to reduce jagged edges and create smoother transitions in raster images?

Accepted Answer

Anti-aliasing

Answer

Aliasing

Answer

Dithering

Answer

Diffusion

Question 14

What is the primary purpose of a pixel mask in raster image editing?

Accepted Answer

To select and define specific regions of an image for targeted editing or protection

Answer

To automatically enhance the contrast and color balance of an image

Answer

To remove unwanted noise or artifacts from an image

Answer

To convert an image from one color space to another

Question 15

Which color space is commonly used to represent images on the World Wide Web?

Accepted Answer

sRGB

Answer

XYZ

Answer

Adobe RGB

Answer

CMYK

Question 16

What is the primary advantage of utilizing a Graphics Processing Unit (GPU) for raster graphics operations?

Accepted Answer

Increased parallelism and computational efficiency

Answer

Enhanced memory bandwidth and data transfer rates

Answer

Reduced power consumption and energy efficiency

Answer

Improved user interface and graphical display capabilities

Question 17

Which algorithm is commonly employed for combining multiple images or elements together to create a composite image?

Accepted Answer

Alpha blending

Answer

Z-buffering

Answer

Bresenham's line algorithm

Answer

Flood fill algorithm

Question 18

What is the primary function of the alpha channel in raster images?

Accepted Answer

It controls the transparency of an image, allowing for blending and overlay effects.

Answer

It determines the color depth and number of colors an image can display.

Answer

It provides depth information for 3D rendering and modeling.

Answer

It is used for image segmentation and object recognition.

Question 19

Which color model is based on how humans see colors and uses the primary colors red, green, and blue?

Accepted Answer

RGB

Answer

CMYK

Answer

HSL

Answer

HSV

Question 20

Which color model, widely used in digital image processing, represents colors using combinations of red, green, and blue values?

Accepted Answer

RGB

Answer

CMYK

Answer

HSV

Answer

XYZ

Question 21

What data structure is primarily used to represent raster images, where each pixel is stored as a numerical value?

Accepted Answer

Array

Answer

Bitmap

Answer

Tree

Answer

Graph

Question 22

What mathematical operation, when applied to an image, reduces its resolution by selecting only a subset of the original pixels?

Accepted Answer

Subsampling

Answer

Convolution

Answer

Interpolation

Answer

Quantization

Question 23

Which advantage sets raster graphics apart from vector graphics, allowing for more realistic and detailed representations?

Accepted Answer

Higher photorealistic quality

Answer

Smaller file sizes

Answer

Scalability to any resolution

Answer

Object-oriented representation

Question 24

What is the purpose of anti-aliasing in raster graphics, and how does it improve image quality?

Accepted Answer

To reduce jagged edges on diagonal lines, creating smoother transitions

Answer

To increase the color depth of an image, enhancing its richness

Answer

To compress an image without losing data, reducing file size

Answer

To enhance the sharpness of an image, making details more visible

Question 25

Which method is commonly used to reduce the effects of noise in raster images, effectively smoothing out the image?

Accepted Answer

Median filter

Answer

Histogram equalization

Answer

Thresholding

Answer

Region growing

Question 26

In image sampling, what is the significance of the Nyquist frequency, and how does it affect the quality of the sampled image?

Accepted Answer

It determines the minimum sampling rate required to avoid aliasing, preserving image fidelity

Answer

It defines the maximum resolution an image can have, limiting its size

Answer

It represents the color depth of an image, determining its range of colors

Answer

It is the frequency at which an image should be displayed, optimizing visual perception

Question 27

What is a key disadvantage of using lossy compression for images, and how does it impact the resulting image?

Accepted Answer

Reduced image quality, resulting in artifacts and loss of detail

Answer

Increased file size, making the image larger and harder to store

Answer

Complicated decompression algorithms, requiring specialized software to view

Answer

Loss of color information, limiting the range of colors in the image

Question 28

What is the primary purpose of a histogram in image processing, and how does it assist in image analysis?

Accepted Answer

To visualize the distribution of pixel values, providing insights into image characteristics

Answer

To identify the dominant colors in an image, helping to make color-based decisions

Answer

To adjust the brightness and contrast of an image, improving its overall appearance

Answer

To remove noise from an image, enhancing its clarity

Question 29

In the RGB color model, which of the following is **not** a primary color?

Accepted Answer

Cyan

Answer

Red

Answer

Green

Answer

Blue

Question 30

An image has a width of 1024 pixels and a height of 768 pixels. What is its resolution?

Accepted Answer

1024 x 768

Answer

768 x 1024

Answer

1792 x 1536

Answer

512 x 384

Question 31

Which image file format uses lossy compression?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

BMP

Question 32

What is the primary purpose of an alpha channel in an image?

Accepted Answer

To store transparency information

Answer

To represent the color depth

Answer

To enhance the color accuracy

Answer

To reduce the file size

Question 33

Which technique is used to smooth transitions between adjacent pixels?

Accepted Answer

Anti-aliasing

Answer

Dithering

Answer

Quantization

Answer

Chroma subsampling

Question 34

What is the key difference between lossless and lossy compression algorithms?

Accepted Answer

Lossless algorithms preserve all original data, while lossy algorithms discard some data.

Answer

Lossy algorithms preserve all original data, while lossless algorithms discard some data.

Answer

Both algorithms preserve all original data.

Answer

Both algorithms discard some of the original data.

Question 35

Which image editing tool is primarily used to modify individual pixels?

Accepted Answer

Brush tool

Answer

Selection tool

Answer

Smudge tool

Answer

Clone stamp tool

Question 36

In a graphics pipeline, what is the function of a pixel shader?

Accepted Answer

Determines the color of each pixel

Answer

Transforms vertices into pixels

Answer

Generates the geometry of an object

Answer

Rasterizes images

Question 37

Which is a major advantage of raster graphics over vector graphics?

Accepted Answer

Ability to represent complex images with smooth gradients

Answer

Smaller file sizes

Answer

Higher resolution

Answer

Ease of manipulation

Question 38

What is the name of the algorithm used to reduce the number of colors in an image?

Accepted Answer

Quantization

Answer

Dithering

Answer

Anti-aliasing

Answer

Chroma subsampling

Question 39

Which of the following is NOT a characteristic of raster graphics?

Accepted Answer

Vector-based representation

Answer

Lossy compression possible

Answer

Pixel-based representation

Answer

Resolution-dependent

Question 40

What is the primary advantage of using a higher resolution for a raster image?

Accepted Answer

Increased detail and clarity

Answer

Smaller file size

Answer

Improved compatibility across different devices

Answer

Faster loading times

Question 41

Which color model uses three primary colors (red, green, blue) to represent a wide range of colors?

Accepted Answer

RGB

Answer

CMYK

Answer

Lab

Answer

HSB

Question 42

Which image file format is typically used for lossless compression, preserving all original image data?

Accepted Answer

TIFF

Answer

JPEG

Answer

PNG

Answer

GIF

Question 43

When editing a raster image, what is the effect of applying a sharpening filter?

Accepted Answer

Enhances edges and details

Answer

Reduces noise and grain

Answer

Changes the image's color palette

Answer

Creates a blurred effect

Question 44

Which of the following scenarios would benefit most from using a raster graphics format?

Accepted Answer

Editing a high-resolution photograph for printing

Answer

Creating a logo for a website

Answer

Designing a scalable icon for multiple devices

Answer

Drawing a technical diagram with precise lines and shapes

Question 45

What is the purpose of dithering in raster graphics?

Accepted Answer

Simulate more colors using a limited palette

Answer

Sharpen edges and details

Answer

Reduce the file size of an image

Question 46

Which of the following statements accurately describes the concept of pixelation?

Accepted Answer

The appearance of blocky squares when a raster image is enlarged

Answer

A technique for reducing the file size of an image by discarding data

Answer

The process of converting a vector image to a raster image

Question 47

In the context of raster graphics, what is the significance of the bit depth of an image?

Accepted Answer

Determines the number of colors that can be represented per pixel

Answer

Influences the file size of the image

Answer

Defines the resolution of the image

Question 48

Which of the following is NOT a common raster graphics software application?

Accepted Answer

Adobe Illustrator

Answer

Paint.NET

Answer

Adobe Photoshop

Answer

GIMP