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2008.12.14 05:59 "Re: Tiff Digest, Vol 55, Issue 2", by Bob Friesenhahn
On Sun, 14 Dec 2008, navneet rastogi wrote: > I am working on a project i.e. "LZW compression & > Decompression".I have been achieved the compression completely but in > case of decompression a problem occured i.e When we decompress a data > using LZW there is no table is given, it creates it by own but when we > creating a table and there occured a sequence of same character then > according to the Mark Nelson it's a exception in LZW .and it doesn't > work.e.g "THGFFF" we compressed it then output is "THGF259" then when > we decompressed it I have read that LZW compression in TIFF is not completely conformant to other LZW implementations. Maybe the small deviation is causing the problem you are seeing? This text seems to be a decription of LZW compression specifically as it applies to TIFF" "http://www.fileformat.info/format/tiff/corion-lzw.htm". There is also "http://www.fileformat.info/mirror/egff/ch09_04.htm" which mentions TIFF specific LZW deviations. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/