Computer Science Image Quiz

Which of the following file-formats has poor image quality when enlarged?

• JPEG

• Adobe Portable Document Format (PDF)

• Scalable Vector Graphics (SVG)

What are vector images?

• Images that use coordinates and geometrical shapes to define an image.

• Images that use organised grid of coloured squares.

• Images that are black-and-white.

How are images displayed?

• As a matrix of 0’s and 1’s

• As a grid of pixels

• As a matrix of binary values

What is colour depth?

• The number of bits used to indicate an image.

• The intensity of colour at each pixel.

• The number of bits used to indicate a pixel.

How many different colours does a n-bit system represents?

• 2×n different colours

• 2^n different colours

• n^2 different colours

What is the difference between these two images?

• Colour depth

• Resolution

• Number of pixels

• Height and width of image

What is the difference between these two images?

• Resolution

• Colour depth

• Height and width of image

Estimate the size of an image with: Height: 510 pixels Width: 402 pixels Colour depth: 16 bits

• 0.41 megabytes

• 0.41 bytes

• 0.41 gigabytes

Which of the following statement is TRUE about colour depth?

• As the colour depth increases, the file size increases.

• A 2-bit colour depth results in a black-and-white image.

• A 24-bit colour depth may represent millions of colours per pixel.

• All of the above

Which of the following represents the calculation for estimating size of an image file?

• File size (bytes)= height (p) × width (p) × colour depth (bits per pixel)

• File size (megabytes)= height (p) × width (p) × colour depth (bits per pixel)

• File size (bits)= height (p) × width (p) × colour depth (bits per pixel)