Unit 1 : Data representations

Question 1

What is a way of representing an image

Answer 1

Using a bitmap

Question 2

How do you have more colours in images

Answer 2

Add more bits

Question 3

What is the colour depth

Answer 3

Number of bits per pixel

Question 4

How do you find number of combinations

Answer 4

number of combinations of n bits = 2n
For example :
what is maximum number of colors that can be represented using 3 bits
2 x 2 x 2 = 8

Question 5

Colour depth can impact quality of an image

Answer 5

1 bit color depth means the image can only be black and white

Question 6

What is a greyscale image

Answer 6

Image that only uses shades of grey to represent the image

Question 7

What is image resolution

Answer 7

Number of pixels per inch

Question 8

How can image resolution be expressed

Answer 8

The number of pixels across the width of the screen by how many across the height of the screen

Question 9

What happens when a bitmap is upscaled

Answer 9

The individual pixels become larger, when pixels become more visible, the quality of the photo reduces

Question 10

What is metadata

Answer 10

Data about data

Question 11

What is a pixel

Answer 11

Smallest element in an image