Need for Compression (AQA GCSE Computer Science): Flashcards
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Data compression purpose
Data compression purpose
Makes files smaller while keeping important information
Two main problems compression solves
Two main problems compression solves
Storage issues and transmission problems
Storage issues without compression
Storage issues without compression
Large files quickly fill up device memory
Transmission problems without compression
Transmission problems without compression
Takes longer to send and can be expensive
Modern smartphone photo size range
Modern smartphone photo size range
10-20MB each
4K video storage for a few minutes
4K video storage for a few minutes
Over 1GB of storage space
Lossy compression definition
Lossy compression definition
Permanently removes some data to make files smaller
Data removed by lossy compression
Data removed by lossy compression
Data humans are less likely to notice
Can lossy compression be reversed?
Can lossy compression be reversed?
No, cannot be reversed to restore original quality
Lossless compression definition
Lossless compression definition
Reduces file size without permanently losing any information
What files require lossless compression?
What files require lossless compression?
Programs, text documents, files needing perfect accuracy
Which compression type for computer programs?
Which compression type for computer programs?
Lossless compression
Which compression type for music streaming?
Which compression type for music streaming?
Lossy compression
Key difference: lossy vs lossless
Key difference: lossy vs lossless
Lossy = smaller files, quality loss; Lossless = larger, no loss