Difference Between Lossless Compression and Lossy Compression.

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Lossy Compression	Lossless Compression
1. The technique involves some loss of information.	1. Involves no loss of information.
2. Data that has been compressed using this technique can’t be recovered and reconstructed exactly.	2. If data has been (lossless) compressed, the original data can be recovered from the compressed data.
3. Used for application that can tolerate difference between the original and reconstructed data.	3. Used for application that can’t tolerate any difference between original and reconstructed data.
4. In return for accepting this distortion in reconstructed data we obtain high compression rate	4. No loss in information so compression rate is small.
5. Sound and Image compression uses lossy compression.	5. Text compression uses lossless compression
6. More data can be accommodated in channel.	6. Less data can be accommodated in channel.
7. Distortion	7. Distortion less
8. $E.g. \\ (i) Telephone System,\\(ii) Video CD$	8. $E.g \\ (i) Fax Machine, \\ (ii) Radiological Imaging$
9. Example: Text compression -> It is very important that the reconstruction is identical to original text, as very small difference can result in statements with very different meanings. Consider “ Do not send Money “ and “ Do now send Money “	9. Example: When viewing a reconstruction of a video sequence, the fact that the reconstruction is different from the original is generally not important as long as the difference do not result in annoying artifacts. Thus, video is generally compressed using lossy compression.

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