Representing Images

Question 1

What are the 2 ways in which images can be represented?

Answer 1

• Bitmaps or vectors.

Question 2

What is a vector?

Answer 2

• Stores the mathematics to draw coloured shapes.

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Question 3

What is a bitmap?

Answer 3

• Stored in binary.

- Number of bits required for each pixel depends on the number of colours required.

Question 4

What is metadata?

Answer 4

- Additional data stored with the image to define it's:
~ Width
~ Height.
~ Colour Depth
~ Colour pallette.

Question 5

The greater the colour depth and the resolution the greater the….?

Answer 5

• File size

Question 6

What is image resolution?

Answer 6

• Number of pixels within a specific area of an image.
• (DPI) or (PPI).
• Low resolution; - Bigger pixels which mean fewer are needed to fill up the space and don’t have a lot of details.
  High resolution= More pixels, so more detailed.

Question 7

What is colour depth?

Answer 7

• The number of bits required for each pixel is known as colour depth.

Question 8

How do you work out the image size?

Answer 8

Image Size: colour depth x image height x image width.