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AQA A-Level Compression Notes
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- AQA
A set of notes describing how compression works and why it is used. It covers both lossy and lossless compression, has a few examples, and contains valuable tips.
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Reasons for Compression#computer-science #compression #reasons-for-compression
Compression
Compression reduces the size of a file by removing repeated data,
finding patterns and ignoring less useful information.
Files take up less space -- saves money and storag space
Faster and more efficient to transmit data
Text, image and sound data can be greatly reduced in size
Types of Compression
Lossy Compression
Lossless Compression
, Lossless Compression
#computer-science #compression #lossless-compression
Lossless Compression
Patterns in the data are spotted and summarised in a shorter format,
without permanently removing any information.
Lossless compression often results in lower compression ratios than
Lossy Compression, since all the information must be retained.
Uses of Lossless Compression
Lossless compression is often used for text files and binary files, since it
would be bad if any information was lost.
Methods of Lossless Compression
Run Length Encoding
Dictionary Compression
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