Data Representation

Question 1

What is Resolution?

Answer 1

How many pixels are in a certain space

Question 2

What is Colour Depth?

Answer 2

The number of bits used for each pixel

Question 3

What is Metadata?

Answer 3

The information about the image file that is stored within it

Question 4

What is Sampling?

Answer 4

The amplitude of the wave is measured at regular intervals which creates a digital representation of the wave

Question 5

What is Compression?

Answer 5

Makes the files sizes smaller

Question 6

What is Lossy Compression?

Answer 6

Permanently removes some of the data from a file to make the file size smaller

Question 7

What is Lossless Compression?

Answer 7

Data is temporarily removed from the file and then put back together when it is opened

Question 8

What are Images made up of?

Answer 8

Pixels

Question 9

What numbers does Denary use?

Answer 9

0-9

Question 10

What numbers does Binary use?

Answer 10

0 and 1

Question 11

What values does Hexadecimal use?

Answer 11

0 - F

Question 12

How many Bits are in a Byte?

Answer 12

8 Bits

Question 13

What is a Binary Shift?

Answer 13

Moving the Binary Number to the Left or Right
Left Shift - Multiplies the number by 2
Right Shift - Divides the number by 2

Question 14

What is a Character Set?

Answer 14

The characters that are recognised or represented by a computer system

Question 15

What is ASCII?

Answer 15

Each character is represented by a 7 bit number with a 0 in front to make it up to a byte

Question 16

What is Extended ASCII?

Answer 16

Each character is represented by an 8 bit binary number

Question 17

How many different possibilities are there in Extended ASCII?

Answer 17

256 Possibilities

Question 18

What is Unicode?

Answer 18

Each letter is represented by a 16 bit or 32 bit binary number
This gives at least twice as many character options as ASCII and allows the character set to represent characters and symbols from all languages