Compression: lossy and lossless
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The teaching part (1 min) is free to watch. A free account opens the whole lecture: 5 practice questions, 2 real past-paper questions with the answers explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
What this lecture covers
- Too big to send
- Why compress?
Read the transcript of the teaching part
Last time
Before we start: last time, in Data storage units and file sizes, you learned these points. Here they are again on one card. Keep them in mind, because today builds on them.
Too big to send
You record a video and WhatsApp says the file is too big. Compression is the answer: making a file smaller. There are two kinds, lossy and lossless, and Cambridge asks about both every year.
Why compress?
Why compress a file? It takes less storage space. It uploads, downloads and sends faster, and needs less bandwidth. It uses less of your data allowance, and it can fit under an email's attachment limit.
Chapter 1.10: Compression
- Compression: lossy and lossless 5 min
Also for IGCSE Computer Science 0478
Which topics come up most in IGCSE Computer Science 0478 past papers, counted from every paper since 2004: Paper 1 topic frequency, Paper 2 topic frequency.