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March 2006
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2006.03.04 03:05 "LZW Compression with 16-bit TIFF", by Frank Peters
Hello, My problem concerns the compression of tiff files using the command: tiffcp -c lzw:2 file.tif file_compressed.tif With 8-bit tiff files this compression reduces the the file size by about 30%. With 16-bit tiff files, however, the compressed file is actually LARGER. For example, using the above command a 36 megabyte 16-bit tiff file will "compress" to about 46 megabytes. For the other possible options, "-c lzw:1" and "-c lzw", the results are essentially the same. The compressed file is always significantly larger. If I use "-c zip" as the option, 16-bit files are reduced somewhat (from 36 Mb to 34 Mb). Is there possibly a bug in the 16-bit lzw code or does the fault lie elsewere? Frank Peters