LZW - Revision history

Jsummers: /* Related formats */

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‎Related formats

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‎Resources

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LoCFDD

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fmt

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‎References: Adding references.

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 * [[GIF]]
 * [[TIFF]]
-* [[compress]]
+* [[compress (Unix)]]
 == Resources ==

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 * [http://www.cs.duke.edu/courses/spring03/cps296.5/papers/welch_1984_technique_for.pdf A Technique for High-Performance Data Compression] Welch, Terry A.  Computer, Vol. 17, No. 6 (June 1984): pp. 8-19
 * [http://en.wikipedia.org/wiki/LZW Lempel-Ziv-Welch : Wikipedia]
 * [http://marknelson.us/2011/11/08/lzw-revisited/ LZW Revisited] a 2011 update to an article by Mark Nelson written 20 years earlier.
-* [http://www.fileformat.info/mirror/egff/ch09_04.htm Lempel-Ziv-Welch (LZW) Compression] From Encyclopedia of Graphics File Formats at FileFormat.Info (1996)
+* [http://www.fileformat.info/mirror/egff/ch09_04.htm Lempel-Ziv-Welch (LZW) Compression], from the [[Encyclopedia of Graphics File Formats]]
 * [http://www.google.com/patents/US4558302 US Patent 4,558,302]

← Older revision		Revision as of 22:42, 7 June 2013
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	* [http://marknelson.us/2011/11/08/lzw-revisited/ LZW Revisited] a 2011 update to an article by Mark Nelson written 20 years earlier.		* [http://marknelson.us/2011/11/08/lzw-revisited/ LZW Revisited] a 2011 update to an article by Mark Nelson written 20 years earlier.
	* [http://www.fileformat.info/mirror/egff/ch09_04.htm Lempel-Ziv-Welch (LZW) Compression] From Encyclopedia of Graphics File Formats at FileFormat.Info (1996)		* [http://www.fileformat.info/mirror/egff/ch09_04.htm Lempel-Ziv-Welch (LZW) Compression] From Encyclopedia of Graphics File Formats at FileFormat.Info (1996)
		+	* [http://www.google.com/patents/US4558302 US Patent 4,558,302]

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 |released=1984
 }}
-LZW (Lempel-Ziv-Welch) is a lossless compression algorithm based on [[LZ78]]. It was developed by Terry Welch in 1984. It is infamous for being widely used in various standard formats (especially [[GIF]]) by developers unaware that it was encumbered by [[patents]]. The patents expired around 2003.
+'''LZW''' (Lempel-Ziv-Welch) is a lossless compression algorithm based on [[LZ78]]. It was developed by Terry Welch in 1984. It is infamous for being widely used in various standard formats (especially [[GIF]]) by developers unaware that it was encumbered by [[patents]]. The patents expired around 2003.
 There are many variations of LZW in use. In general, LZW compresses a stream of ''symbols'' into a stream of bits. For general-purpose file compression, the symbols are usually taken to be bytes, but for GIF format the symbols are pixels.

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 |formattype=electronic
 |subcat=Compression
 |pronom={{PRONOM|x-cmp/12}}
 |released=1984

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 }}
-[[LZW]] (Lempel-Ziv-Welch )is a widely used lossless compression algorithm used primarily for images.  It is the compression scheme used in [[GIF]] and is frequently used in [[TIFF]] images.  Developed by Terry Welch in 1984.  All patents on the LZW algorithm worldwide have expired.
+[[LZW]] (Lempel-Ziv-Welch) is a widely used lossless compression algorithm used primarily for images.  It is the compression scheme used in [[GIF]] and is frequently used in [[TIFF]] images.  Developed by Terry Welch in 1984.  All patents on the LZW algorithm worldwide have expired.
 == References ==

← Older revision		Revision as of 02:55, 12 November 2012
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	* [http://www.digitalpreservation.gov/formats/fdd/fdd000135.shtml LZW Compression Encoding, from Library of Congress resource on Sustainability of Digital Formats]		* [http://www.digitalpreservation.gov/formats/fdd/fdd000135.shtml LZW Compression Encoding, from Library of Congress resource on Sustainability of Digital Formats]
	* [http://marknelson.us/2011/11/08/lzw-revisited/ LZW Revisited] a 2011 update to an article by Mark Nelson written 20 years earlier.		* [http://marknelson.us/2011/11/08/lzw-revisited/ LZW Revisited] a 2011 update to an article by Mark Nelson written 20 years earlier.
		+	* [http://www.fileformat.info/mirror/egff/ch09_04.htm Lempel-Ziv-Welch (LZW) Compression] From Encyclopedia of Graphics File Formats at FileFormat.Info (1996)