Compression
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What does compression mean?
• Making a file smaller.
Benefits of compression:
• Files take up less storage space so more files can be stored. • Files can be transferred quicker because they are smaller. • Files can be read from or written to quicker.
Lossy Compression - what does it do, how does it work, what are some examples where it is used?
• Uses an algorithm to analyse a file and remove data that cannot be heard or seen by humans. • This reduces the size of the file. • Further lossy compression removes data that humans can see/hear. • Removes data permanently, so the file can never return to its original form. • Used with images, audio and video.
Lossless Compression - what does it do, how does it work, what are some examples where it is used?
• Reduces the size of a file without permanently removing any data. • Because of this, the file is returned to its original form when decompressed, so no quality is lost. • The finished file size is usually larger with lossless than with lossy because no data has been permanently removed. • Used with files that wouldn’t work it data was not removed for example executable files (programs, games) and word documents.