What is a pixel and how is it used to represent an image?

Computer Image Representation

Quiz
•
Computers
•
8th Grade
•
Hard
TABASSUM BEGUM
Used 2+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A pixel is a measurement of image brightness and has no role in representing an image
A pixel is a type of computer virus that can corrupt images
A pixel is the smallest unit of a digital image, and it is used to represent an image by combining multiple pixels to form the complete picture.
A pixel is a unit of measurement for printed images, not digital ones
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the difference between raster graphics and vector graphics.
Raster graphics are used for 3D images, while vector graphics are used for 2D images.
Raster graphics have smooth edges, while vector graphics have pixelated edges.
Raster graphics are black and white, while vector graphics are in color.
Raster graphics are made up of pixels, while vector graphics are made up of paths and curves.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Name three common image file formats and describe their characteristics.
JPEG, PNG, GIF
MP3, MP4, WAV
PDF, TIFF, BMP
TXT, DOCX, PPTX
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is lossless compression and how does it work in image representation?
Lossless compression only preserves half of the original data in the image
Lossless compression removes some data from the image
Lossless compression preserves all original data in the image.
Lossless compression changes the color of the image
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of lossy compression in image files?
To increase file size by adding unnecessary image data
To improve image quality by reducing pixel density
To make the file incompatible with certain devices or software
To reduce file size by permanently eliminating some image data
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of color depth in relation to image representation.
The brightness of the image
The number of colors in the image
The size of the image in pixels
The number of bits used to represent the color of a single pixel in an image.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does a computer use RGB values to represent colors in an image?
By converting the RGB values to hexadecimal format
By using black, white, and gray colors only
By combining different intensities of red, green, and blue light
By mixing red, yellow, and blue colors
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