Colour by Numbers–Image Representation

How do computers store and send images? Here's an activity that explains one way a computer can compress image information. Pupils decode run-length coding to produce a black and white image. Pairs then work together to code and decode their own images.

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Instructional Ideas

  • Discuss with the class what people create with pixels
  • Start the activity by either having the class read "What's it all about?" or a presentation about compression
Classroom Considerations

  • Some pupils may not know about faxes

  • An extension activity provides a suggestion on how to make color images
  • The videos provide examples of how to use the data compression method

  • None