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NSWInformation Processes and TechnologyQuick questions
Option: Multimedia Systems
Quick questions on Information processes in multimedia systems for HSC Information Processes and Technology
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What is compression?Show answer
Raw multimedia files, especially audio and video, are huge, so compression reduces their size for storage and delivery. Lossless compression reduces size without discarding any data, so the file restores exactly; it suits text and images where every detail matters but gives modest size reductions. Lossy compression discards detail the human eye or ear is unlikely to notice, achieving much larger reductions; it is used for photographs, music and video where some loss is acceptable. Choosing the type and degree of compression trades quality against size and download or streaming speed.
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