To reduce the amount of storage needed, to allow large files to be sent over email & to allow a file to be transmitted in less time
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What's lossy compression?
a data encoding method which compresses a file by removing some detail (for example storing a photograph with fewer colours so fewer bits are needed)
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What's an advantage of lossy compression?
It reduces file size (smaller than lossless)
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What's a disadvantage of lossy compression?
It get's rid of some of the detail (e.g. can't be used on document)
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What's lossless compression?
a data encoding method where files are compressed but no data is lost
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What's an advantage of lossless compression?
it keeps all of the data (so it can be used on documents)
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What's a disadvantage of lossless compression?
it doesn't reduce size as much as lossy
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What's run length encoding (RLE)?
it's a form of lossless compression using data pairs
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When is RLE useful and not useful?
RLE is not so useful with files that don't have many runs, but is on simple images that contain many pixels that are the same colour
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What's huffman coding?
a compression technique that reduces the number of bits to represent each letter - the more frequently it appears, the fewer bits needed to represent it
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Other cards in this set
Card 2
Front
What's lossy compression?
Back
a data encoding method which compresses a file by removing some detail (for example storing a photograph with fewer colours so fewer bits are needed)
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