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Summary A Level OCR Computer Science (1.3 Notes) £5.99   Add to cart
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Summary A Level OCR Computer Science (1.3 Notes)
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Boost your exam performance with our top-notch Computer Science Revision Notes, meticulously compiled from official mark schemes of past papers. These concise, exam-focused notes cover all topics in 1.3 (How data is exchanged between different systems) of the A Level OCR specification. Save time...

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  • June 21, 2024
  • 61
  • 2023/2024
  • Summary

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1.3 - How data is exchanged
between different systems

,Compression
Compression: The process of making a file smaller / take up less storage.

Why use compression?

• Reduces download times so it’s faster to stream

• Reduces data usage so saves money

,Lossy compression
Lossy: Reduces file size by permanently removing data. This means that
the file cannot be decompressed to restore its original quality.




- Not suitable for text files because
+ More effective at reducing file size
permanently removing some data will
compared to lossless
make it unreadable
+ Suitable for images & videos because
- The loss of quality on a video may be
the loss of quality is unlikely to be
noticeable if it’s being streamed on a
noticeable
slow connection

, Lossless compression
Lossless: Reduces file size by rewriting the data in a more efficient format,
while still preserving the original data. This means that the file can be
decompressed to restore its original quality.




+ Suitable for text files because the - Less effective at reducing file size
original data is preserved compared to lossy

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