Year 10 - Computing
Lossy and lossless compression
Data compression
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will be introduced to the concept of data compression and why it is needed. The will compare lossy and lossless compression methods and their typical uses. They will have the opportunity to compression methods such as run length encoding (RLE) and Huffman coding.
Lesson Summary
You will learn to compare lossy and lossless data compression.
Key Notes
- Data compression is either lossy and lossless.
- Lossy data compression permanently removes some data to reduce file size.
- Lossless compression reduces file size without losing any data.
Vocabulary To Learn
- lossy: a compression method where data is permanently lost during the process
- lossless: a compression method where no data is permanently lost during the process
- quality: how good, reliable or suitable something is for its intended purpose
Common Mistakes To Avoid
- Lossy compression always results in a poor quality file that is not as usable as the original version.
3 Quick Questions (With Answers)
1. Describe the system or process from this lesson in clear steps.
Data compression is either lossy and lossless. Lossy data compression permanently removes some data to reduce file size.
2. Define this computing term and give one practical example. 'lossy'
a compression method where data is permanently lost during the process. Add one real device or system example to prove understanding.
3. Correct this common computing misconception.
Mistake: Lossy compression always results in a poor quality file that is not as usable as the original version. Correction: Lossy compression removes data that is considered unnecessary or less noticeable, which may not impact the perceived quality of the file, especially to the human eye or ear.
More Lessons In This Unit
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