Lzw compression online dating
LZW is based on a translation table that maps strings of input characters into codes.
Through its incorporation in the graphics file formats GIF_89a and TIFF_LZW, LZW has come to be strongly associated with image compression.
TIFF_G4 (for images of documents) and TIFF_UNC (for documents or pictorial images) are preferred as master images.
Future explorations may add J2K_C (JPEG 2000 Part 1, Core Coding System), especially J2K_L_LL (JPEG 2000 Part 1, Core Coding , Lossless Compression) to the Library's list of preferences. Predecessor algorithms were developed by Abraham Lempel and Jacob Ziv; LZW is the refined version finalized by Terry Welch, an employee of Sperry Corporation (later merged with Burroughs to form the Unisys Corporation). LZW is notorious because of late-in-the-game patent-protection actions taken by Unisys beginning in late 1994, perceived as having an adverse affect on the Web due to that medium's widespread use of GIF images, which employ LZW compression.
The definitive descriptive article by Welch: "A Technique for High-Performance Data Compression." Patent 4,558,302 was granted in 1985; key in number at Patent Number Search at the U. Unisys's US patent expired in June 2003, and its European and Japanese patents expired in June 2004.