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might just be a bit fucked). "Extenuating circumstance to be mentioned on Judgement Day:>We never asked to be born in the first place. As to the contention that PNGs are of a smaller file size, I have found this to be untrue for my purposes. images>, I was unable to achieve a smaller PNG than GIF on even one of my low bandwidth pornographic images. Both were set to lossless which is reasonable when the source image has 6 colors. At least for some people and some purposes, PNGs are inferior to GIFs. 06/20/2003 02:45:11 AM EST (>4. 06/20/2003 03:48:07 PM EST (>1. The GIF patent became public

handling. He calls it LZW, after the names of the inventors, Lempel-Ziv-Welch. The article includes a justification for data compression, an overview of common methods, and a detailed explanation and runthrough of the LZW algorithm. is released by Spencer Thomas, after the LZW article was published but before LZW was patented. readers, Spencer decided to implement the LZW algorithm he read in the magazine, completely unaware that there was a patent pending on the technique. 10th December 1985>: LZW patent is granted. September 1986>: The Sperry Corporation (owners of the Sperry Research

are licensed. The GIF format becomes even more popular. The GIF format becomes even more popular. The GIF format becomes even more popular. The GIF format becomes even more popular. The GIF format becomes even more popular. So the US patent has expired. covers Germany, France, Britain and Italy and expires on the 18th June 2004. expires on the 6th June 2004. This creates an interesting legal situation where LZW-based sofware is legal to distribute in the United States, but risks patent infringement claims in or when exported to Europe, Canada and Japan. hasn't diminished GIF's popularity

knowledge in about 1990, leading to a huge uproar in the online world. Some paniced BBS sysops even took their GIF p0rn offline out of fear. CompuServe or Unisys tried to queal the flames by announcing that there would be no "GIF Tax" -- only encoding/decoding software would be covered; and that interested parties should contact them. As this only affected software developers, there was a huge sign of relief among users. Adobe and other image software makers licenced LZW in 1990-1. Unisys must have said more than "nothing" to them at this time. In 1993, Mosaic spread

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Center) and the Burroughs Corporation merge to form Unisys. 15th June 1987>: Bob Berry and the team at Compuserve release a new graphics file format called GIF (Graphics Interchange Format). It can handle anything from 2 to 256 colours -- wow! -- and the graphics data is compressed with LZW. Just like Spencer, they had read the LZW algorithm in a magazine and had wrongly assumed that it wasn't patented. The GIF format becomes even more popular. tries to bring up the issue in public. Unisys have been ensuring hardware manufacturers (e. modem manufacturers and Postscript printer manufacturers)

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Center) and the Burroughs Corporation merge to form Unisys. 15th June 1987>: Bob Berry and the team at Compuserve release a new graphics file format called GIF (Graphics Interchange Format). It can handle anything from 2 to 256 colours -- wow! -- and the graphics data is compressed with LZW. Just like Spencer, they had read the LZW algorithm in a magazine and had wrongly assumed that it wasn't patented. The GIF format becomes even more popular. tries to bring up the issue in public. Unisys have been ensuring hardware manufacturers (e. modem manufacturers and Postscript printer manufacturers)

and method", it is more commonly known as the LZW patent or Unisys's GIF tax. Don't buy ram at Apple. You can save big money when you buy your memory at MacMemoryStore. Most popular compression techniques build on this technique and most archivers (e. ZIP, ZOO, ARC, gzip, LhA, CAB, Arj, RAR, StuffIt) include it in their compression methods. I only mention this to tell you it's unrelated to LZ78 or LZW. [US4,464,650]>), but the LZW derivative is widely used. Terry Welch has been working for the Sperry Research Center and invents a derivative of LZ78 with much simplified, faster dictionary