Colour images

What do we use to represent images in computers?

• A canvas

• A paintbrush

• A bitmap

• An analogue image

What word is "picture element" often shortened to?

• piel

• piskel

• pixel

• pictel

How many bits do we need for each pixel of a black-and-white image?

• 0

• 1

• 2

• 3

Where is the first pixel of an image

• In the middle

• bottom-left corner

• top-left corner

• top-right corner

• bottom-right corner

The pixel co-ordinates (1,1) refer....

• to the dead centre of the bitmap

• the top-left corner

• to the pixel that is 1-right and 1-down from the top-left corner

• to a question that nobody knows the answer to.

The real world is analogue, whereas data represented by a computer is d______.

(fine with or without the initial letter)

Which three colours are used by computers as primary colours?

• red

• yellow

• cyan

• blue

• green

What do you get when you add RED + GREEN

• red

• green

• yellow

• white

• cyan

How many bits do we need for each pixel in an image with 4 colours?

• 0

• 1

• 2

• 3

How many bits do we need for each pixel in an image with 5 colours?

• 0

• 1

• 2

• 3