Starter quiz
- What is binary?
- a type of computer virus
- the way computers store information ✓
- a programming language
- a hardware component
-
- What can computers store using binary?
- only text
- only numbers
- only sound
- numbers, text, sound and images ✓
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- What is a 'bit'?
- a type of computer program
- a storage device
- a network protocol
- a binary digit ✓
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- What does a pixelated image look like?
- blurry ✓
- black and white
- small
-
Exit quiz
- What does RGB stand for?
- red, green, blue ✓
- red, gold, black
- red, grey, blue
- red, green, black
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- What is the basic unit of data in computing?
- 'bit' ✓
- Match the term with its definition:
- bit⇔basic unit of data ✓
- intensity⇔the amount of colour from 0 to 255 ✓
- pixel⇔a single element of an image ✓
- What is the maximum number of colours can be represented by 2 bits per pixel?
- 2
- 4 ✓
- 8
- 16
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- What does the term 'intensity' refer to in digital imaging?
- the size of a pixel
- the strength of a colour ✓
- the speed of processing
- the resolution of an image
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- How many pixels are in an image that has a grid of 5 x 5 pixels?
- 3
- 25 ✓
- 28
- 75
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Digital pictures are formed out of individual pixels (picture elements).
- The elements in a digital image are arranged in a grid of rows and columns.
- The colour of a pixel can be represented as a mixture of red, green and blue.
Common misconception
The number of bits per pixel that represent the colour are always individual specific colours.
When RGB is used to define the colour of a pixel the bits represent different intesities of red, green and blue providing different colour mixes.
Keywords
Pixel - a single element of an image on a computer screen
Bit - binary digit - the basic unit of data within a computer system that has the value 0 or 1
Rgb system - a colour model used to represent and create colours by combining three colours of light: red, green and blue
Intensity - the strength of a colour, shown by the value of each element (red, green or blue)
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