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Run it in class

How does a phone shrink a huge photo small enough to send in a flash?

Show of hands — before you project anything

Predict first: an all-blue 10-row picture needs 10 run tags. If a 3 × 3 sun patch splits three of those rows, will the whole picture need 13, 16, or 30 tags?

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict first: an all-blue 10-row picture needs 10 run tags. If a 3 × 3 sun patch splits three of those rows, will the whole picture need 13, 16, or 30 tags?
  • Predict a new case: if one stray red pixel splits a long blue row, how many run tags would replace that row's single tag?
  • Real photos still send fast even though they're busy. Predict how — what do you think the phone gives up to make that happen?

Where it shows up in real life

  • A photo that's 'too big to text' until the phone compresses it
  • A plain screenshot of a webpage that saves as a tiny file
  • A detailed nature photo that stays a big file no matter what

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

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