(Y9) Unit 4 - Data Representation

This image consists of individual elements. What are they called?

There is a term for the number of individual elements in an image. What is it?

What is the colour depth of this image?

• 7 colours

• 8 colours

• 3 bits

• 24 bits

How many binary digits does it take to represent this image?

• 3

• 90

• 270

• 630

If this image uses 'RGB colour', then how many bits are used to represent the colour of each pixel?

• 3

• 8

• 24

• Over 16 million

The resolution of this image is 600X400. This means that:

• It consists of 600 pixels and has 400 colours.

• It consists of 240,000 pixels.

• It requires 240,000 bits to be represented.

• It requires 240,000 bytes to be represented.

You check the file properties of the image and see that its size is 800kB (kilobytes). Select one or more equivalent sizes from the list below:

• 800 thousand bytes

• 800 million bytes

• 100kb (kilobits)

• 800kb (kilobits)

You calculate the representation size that this image is supposed to have. You find that the actual size of 800kB is much smaller than you expected. Use one single word to explain this.

• Compression

• Squeezing

This image of a flower has a resolution of 2,000X2,000 and its colour depth is 16 bits (this is a compact version of RGB where 5 bits are used for red and blue and 6 bits are used for green). What is the resolution of the image in megapixels?

• 2000x2000 = 4 million pixels

• 2000x2000 = 400,000 pixels

• 200x2000 = 400,000 pixels

• 200x200 = 40,000 pixels

This image of a flower has a resolution of 2,000⨉2,000 and its colour depth is 16 bits (this is a compact version of RGB where 5 bits are used for red and blue and 6 bits are used for green).

How many binary digits are required to represent the image?

• 64 million bits

• 64 thousand bits

• 64 bits

• 640 thousand bits