Representing Images, Sound & Other Data

Question 1

What are Vector graphics made up of

Answer 1

Made up of lists of objects and their properties

Question 2

What is a vector object

Answer 2

A mathematically/ geometrically defined construct (e.g. rectangle or circle)

Have properties that determine dimensions, appearance and position

Question 3

Where are vector properties stored

Answer 3

Stored in a list called a drawing list

Question 4

Example for storing a circle object

Answer 4

< circle cx = “100” cy = “100” r = “50”
fill = “lightgreen” stroke = “black”
stroke-width = “5” />

cx & cy used to determine centre coords
r used to determine radius of circle
fill used to determine colour of inside
Stroke used to determine border colour
Stroke-width to determine border width

Question 5

Advantages of vector graphics

Answer 5

• can be resized without distortion as they’re scaleable
• smaller file size due to less info stored
• easier to edit vector graphics as each object can be adapted independently
• dont lose quality regardless of resolution

Question 6

Advantages of bitmaps

Answer 6

• can be used to depict any level of complexity and detail
• can represent images not composed of regular shapes

Question 7

Examples of Vector Graphics

Answer 7

• Charts
• Logos
• Web designs

Question 8

Examples of Bitmaps

Answer 8

• photographs
• Scanned images