compression of graphical data in which all of the information is preserved and the quality of the picture is not damaged after the compression
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.
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