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Fri Feb 20, 09 11:59 AM
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Lossless data compression
is a class of data compression algorithms that allows the exact
original data to be reconstructed from the compressed data. This can be
contrasted to lossy data compression, which does not allow the exact
original data to be reconstructed from the compressed data.
Lossless data compression is used in many applications.
For example, it is used in the popular ZIP file format and in the Unix
tool gzip. It is also often used as a component within lossy data
compression technologies.
Lossless compression is used when it is important that the original and
the decompressed data be identical, or when no assumption can be made
on whether certain deviation is uncritical. Typical examples are
executable programs and source code. Some image file formats, like PNG
or GIF, use only lossless compression, while others like TIFF and MNG
may use either lossless or lossy methods.
Link:
http://blog.bitcomet.com/princedude/post_84646/
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