Bitmap and vector images

Question 1

What is a bit pattern?

Answer 1

A bit pattern is a sequence of binary digits, which can be used to represent text, images, video or sound

Question 2

What is a pixel?

Answer 2

The smallest element in a digital image

Question 3

What are the two types of images and how are they different?

Answer 3

A bitmap image/ a vector image

Bitmap images are made of pixels whereas vector images are made of a series of objects and their coordinates.

Question 4

What is colour depth?

Answer 4

The number of bits per pixel. The higher the colour depth the more colours that can be represented

Question 5

What is image resolution?

Answer 5

height x width = resolution

Question 6

What is display resolution?

Answer 6

The number of dots per inch. The more dots the better the image resolution

Question 7

What is metadata?

Answer 7

Is data about data. Provides details about the data such as the resolution, file size, colour depth.

Question 8

How many colours do __ represent?

• 1 bit
• 2 bits
• 4 bits
• 6 bits

Answer 8

• 1 bit = 2 colours
• 2 bits = 4 colours
• 4 bits = 16 colours
• 6 bits = 64 colours

Question 9

What is metadata used for?

Answer 9

Used to help it interpret the data because it’s stored in binary format

Question 10

Formula for image file size

Answer 10

= resolution x colour depth
or
= width x height x colour depth

Question 11

What edits can be made to objects in vector graphics?

Answer 11

Edit:
The shape of the object
Colour of lines or fill in an object
Size of object and thickness of lines
Reference position

Question 12

When are Bitmap and vector images used?

Answer 12

Bitmap images are used in digital photography as they produce realistic images

Vector images are used in engineering to create accurate and precise technical drawings. Can be used for clip art and logos also.

Question 13

Do Bitmap or Vector images take up more storage, explain why.

Answer 13

Bitmap images use pixels so take up more storage whereas vector images use objects and coordinates so take up less space

Question 14

Do Bitmap and Vector images retain their quality when resized?

Answer 14

Bitmap images lose quality when resized and can appear fuzzy whereas vector images retain their quality when rescaled.

Question 15

Do Bitmap or Vector images use the most processing power?

Answer 15

Bitmap images use less processing power whereas Vector images use more processing power.

Question 16

What is a drawing list?

Answer 16

It specifies how to redraw a vector image (by storing the images properties

Question 17

What’s an advantage of using vector graphics?

Answer 17

They have much smaller file sizes, transmit faster and often load faster

Question 18

When might a vector image be used?

Answer 18

For a company’s logo

- can be easily resized and will always appear crisply

Question 19

When might a bitmap image be used?

Answer 19

For retouching/editing photos