2007.07.05 14:26 "Re: [Tiff] 16-Bit-Per-Channel Lossless Compression", by Andrey Kiselev

On Thu, Jul 05, 2007 at 03:45:47PM +0200, Joris wrote:

$ gdal_translate -co "COMPRESS=ZIP" -co "PREDICTOR=2" -co "TILED=YES" -co "BLOCKXSIZE=256" -co "INTERLEAVE=BAND" IMG_2948.Flowers1.tif IMG_2948.Flowers1-zip2-tiled-sep.tif

As I don't speak gdalese, what size do tiles have in your test? It's my opinion ideally efficient tiles over a broad range of compression modes, that fit workflow on today's machines best, are in the order of about 1 to 3 megabyte, not the legacy 8 kilobyte (uncompressed, of course). I believe that for some compression modes, tile size does have a considerable impact on efficienty.

It is 256x256. I have tried bigger tiles but without any gain in compression ratio.

Best regards,

Andrey

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Andrey V. Kiselev
ICQ# 26871517