The specification was revised on 31 December 1998 as version 1.1, which addressed technical problems for gamma and color correction. The full specification of PNG was released under the approval of W3C on 1 October 1996, and later as RFC 2083 on 15 January 1997. The group would become known as the PNG Development Group, and as the discussion rapidly expanded, it later used a mailing list associated with a CompuServe forum. Other suggestions later implemented included the deflate compression algorithm and 24-bit color support, the lack of the latter in GIF also motivating the team to create their file format. Oliver Fromme, author of the popular JPEG viewer QPEG, proposed the PING name, eventually becoming PNG, a recursive acronym meaning PING is not GIF, and also the. Other users in that thread put forth many propositions that would later be part of the final file format. One of them was Thomas Boutell, who on 4 January 1995 posted a precursory discussion thread on the Usenet newsgroup "aphics" in which he devised a plan for a free alternative to GIF. The patent required that all software supporting GIF pay royalties, leading to a flurry of criticism from Usenet users. The motivation for creating the PNG format was the realization that, on 28 December 1994, the Lempel–Ziv–Welch (LZW) data compression algorithm used in the Graphics Interchange Format (GIF) format was patented by Unisys. See also: Graphics Interchange Format § Unisys and LZW patent enforcement
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