1

Question 1

pixel definition

Answer 1

smallest element in an image

Question 2

file header

Answer 2

contains data about the bitmap e.g number of colours

Question 3

run length encoding

Answer 3

lossy compression method
replaces the sequence of the same colour pixel
with the colour code and amount of times the pixel repeats

Question 4

how a word is represented by ASCII character set

Answer 4

• each character has its own unique code
• the codes are stored in order of the word

Question 5

why sound is closer to original when higher sample rate is used

Answer 5

• smaller time gaps between samples
• smaller quantization samples

Question 6

meaning of property in vector graphic

Answer 6

geometric data that determine the shape and appearance of object

Question 7

meaning of drawing list in vector graphic

Answer 7

a set of commands defining the vector

Question 8

bitmap

Answer 8

• made up of colours stored for each pixel
• when enlarged it pixelates

Question 9

vector graphic

Answer 9

• set of instructions about how to draw the shape
• when enlarged doesn’t pixelate / lose quality
• individual components of image can be edited

Question 10

methods to compress image

Answer 10

• reduce bit depth to reduce number of bits per colour
• reduce image resolution so fewer pixels per unit

Question 11

bit depth

Answer 11

number of bits used to represent each colour

Question 12

how changing colour depth affects file size

Answer 12

• increasing colour depth increases file size
• as there are more bits per pixel so more data stored

Question 13

character set meaning

Answer 13

all characters a computer can use
each character has a unique binary code

Question 14

unicode

Answer 14

goes up to 32 bits
different languages represented

Question 15

sampling rate

Answer 15

number of samples taken per second
- quantization errors

Question 16

sampling resolution

Answer 16

number of bits per sample