Section 3 Chapter 16 - Bitmapped Graphics

Question 1

Bitmap (raster)

Answer 1

An image that contains many pixels to make up an image. Each pixel has a colour associated with it

Question 2

Equation for resolution

Answer 2

width * height

Question 3

PPI

Answer 3

Pixels per inch. A value that says how many pixels are in a strip of one inch

Question 4

Colour depth

Answer 4

The number of bits used in each pixel for the colour

Question 5

Standard colour depth

Answer 5

32 bits
8 - red
8 - blue
8 - green
8 - alpha

Question 6

Metadata

Answer 6

Data describing other data

Question 7

Examples of metadata for an image (4)

Answer 7

• Dimensions
• Colour depth
• File name
• Date

Question 8

Vector image

Answer 8

An image made up of geometric shapes and objects

Question 9

Properties of a circle in a vector image

Answer 9

• Centre co-ordinates
• Radius
• Fill colour
• Line colour
• Line weight

Question 10

Vector drawing list

Answer 10

The list of geometric shapes and objects stored in a vector graphics file

Question 11

Advantages of vector graphics (2)

Answer 11

• No matter how large the image is the image will always be sharp and will never pixelate
• Smaller file size

Question 12

Advantage of bitmap graphics (2)

Answer 12

• Can easily replicate areas of continuously changing colours such as photographs
• Individual pixels can be easily manipulated in a program like photoshop

Question 13

Pixel

Answer 13

A small single element of a bitmap that has a single colour associated with it

Question 14

Storage requirements for a bitmap

Answer 14

resolution * colour depth + metadata storage

Question 15

Why might the actual storage of an image be different to what you would calculate

Answer 15

• Metadata

- Compression