Starter quiz
- What is a pixel?
- a unit of digital data storage
- a type of computer hardware
- a measurement of screen brightness
- a single element of an image on a computer screen ✓
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- How are digital images arranged?
- in a circular pattern
- randomly
- in a grid of rows and columns ✓
- in layers
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- What does RGB stand for in digital imaging?
- red, gold, blue
- red, green, blue ✓
- red, grey, black
- red, green, black
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- What unit is used to measure data in a computer system?
- 'bit' ✓
- Which is the smallest file size?
- 1 kB
- 1 byte ✓
- 1 GB
- 1 MB
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- What can happen to an image if you make it bigger?
- the image becomes more pixelated ✓
- a border is added
- it changes the image's shape
- it contains more colours
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Exit quiz
- Match the term to its definition:
- resolution⇔dimensions of an image in pixels ✓
- colour depth⇔number of bits used to represent colour ✓
- file size⇔amount of data a file contains ✓
- Match the concept to its effect:
- increasing resolution⇔enhances image clarity ✓
- reducing resolution⇔decreases image clarity ✓
- increasing colour depth⇔enhances colour accuracy and richness ✓
- reducing colour depth⇔decreases colour accuracy and richness ✓
- What happens when you increase the colour depth of an image?
- the image becomes black and white
- the file size decreases
- the image resolution decreases
- the file size increases ✓
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- What does file size measure?
- the amount of data a file contains ✓
- the number of colours in a file
- the speed at which a file opens
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- How can file size be reduced without changing resolution?
- by increasing colour depth
- by reducing colour depth ✓
- by changing the file format
- by increasing the number of pixels
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- What is the file size of a file measuring 10 x 10 pixels and which allows 4 colours?
- '200 bits' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The colour of each element in a digital image is represented using binary digits.
- Changing image quality (resolution) affects file size: higher quality increases size, lower quality decreases it.
- Changing colour depth affects file size: higher colour accuracy increases size, lower accuracy decreases it.
Common misconception
1 bit is always used to represent 1 pixel.
While bits are used to represent the colour of pixels, it's not always a one-to-one relationship. The number of bits used can vary depending on the colour depth of the image.
Keywords
Resolution - the dimensions of an image in pixels, or the number of pixels per inch (PPI), which affects image quality
Colour depth - the number of bits used to represent a colour, which is also known as bit depth
File size - the amount of data a file contains
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