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May 2004
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2004.05.18 17:58 "Re: Compression", by Andrey Kiselev
On Tue, May 18, 2004 at 04:04:42PM +0200, Dlpnet wrote: > > Efficiency of compression is depend on the nature of your data. In > > general LZW works better than Packbits and Deflate works better than > > LZW So your question does not make sense without data description (in > > terms of size, type and contents). > > Thanks for your answer. In fact my main concern is to understand why I > have no gain when changing the compression scheme. (is it because I m > writing line by line ?) > > And I m wondering if I ll have better result if I don t write line by > line (if possible). Line by line writing results in stripped image. Tiled images sometimes compresses better than tiled. Size of tiles/stripes has matter too and best size differs for different algorithms. I'm recommend you to experiment with the tiffcp utility: it is possible to probe various compression schemes and image organizations and pick up the best parameters for your data. Andrey -- Andrey V. Kiselev Home phone: +7 812 5274898 ICQ# 26871517