Computing

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A splash of colour

In this lesson, they will explore the most common representation of colour as a mixture of red, green, and blue: the level of each of these colours in the mixture is represented using an 8-bit sequence. Learners will also build on their existing knowledge to calculate the representation size of digital images.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Digital images are composed of individual elements, arranged in a rectangular grid. The elements of a digital image are called .............................................

1/5

Q2.The number of pixels in a digital image is the image .......................................

2/5

Q3.The (fixed) number of binary digits used to represent each pixel’s colour is the colour depth . How many colours are possible with a colour depth of 7 bits?

3/5

Q4.Images with a high colour depth and high resolution are great because ................................. (Select all the options that apply)

Select three (3) boxes

4/5

Q5.Digital images that are formed using a binary representation of each pixel’s colour are called bitmaps or raster images. True or False?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Digital images are composed of individual elements, arranged in a rectangular grid. The elements of a digital image are called .............................................

1/5

Q2.The number of pixels in a digital image is the image .......................................

2/5

Q3.The (fixed) number of binary digits used to represent each pixel’s colour is the colour depth . How many colours are possible with a colour depth of 7 bits?

3/5

Q4.Images with a high colour depth and high resolution are great because ................................. (Select all the options that apply)

Select three (3) boxes

4/5

Q5.Digital images that are formed using a binary representation of each pixel’s colour are called bitmaps or raster images. True or False?

5/5

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Worksheet

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These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

A Splash of Colour

Helps to assess your understanding of image resolution,colour depth and calculating representation size.

Q1.The two factors that determine the representation size of an image are .................................... and ............................................. [Select two answers from the given list]

Select two (2) boxes

1/5

Q2.An Image of oranges has a resolution of 220⨉200 and a colour depth of 4 bits. How many pixels are in this image?You can use calculator for this task.

2/5

Q3.There are 448 individual elements in an image. What is this number called?

3/5

Q4.How many different colours can there be in an image with the colour depth of 4 bits?

4/5

Q5.A rainbow icon has a file size of 240 bits . Convert this file size into bytes.

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

A Splash of Colour

Helps to assess your understanding of image resolution,colour depth and calculating representation size.

Q1.The two factors that determine the representation size of an image are .................................... and ............................................. [Select two answers from the given list]

Select two (2) boxes

1/5

Q2.An Image of oranges has a resolution of 220⨉200 and a colour depth of 4 bits. How many pixels are in this image?You can use calculator for this task.

2/5

Q3.There are 448 individual elements in an image. What is this number called?

3/5

Q4.How many different colours can there be in an image with the colour depth of 4 bits?

4/5

Q5.A rainbow icon has a file size of 240 bits . Convert this file size into bytes.

5/5

Lesson summary: A splash of colour

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Collage

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