Lossy compression routines

Submitted by Anonymous on Fri, 2007-12-07 21:24.

Lossy compression routines can use a fixed ratio because they can throw away data until that ratio is met. Which is why you have fixed rate MP3 such as 168kb/s.

Lossless compression routines compression ratios are data dependent. Imagine 1MB file of all zeros. All you need to know about that file is it's size and the fact it is filled with zeros. You can compress that file a LOT. On the other hand, a file of random bits is uncompressable. You will likely end up with a larger file than you started with. The compression ratio is worse than 1:1.

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