[gdal-dev] LZW Compression on geotiffs

[Jukka Rahkonen]

Rahkonen Jukka (Tike <jukka.rahkonen <at> mmmtike.fi> writes:


> > True, a way to improve things might be to specify -co PREDICTOR=2. Should
> > apply to both LZW and DEFLATE.
> > This is one of the filter that might be used by PNG, except that PNG has
different
> > filters, so it will eventually beat TIFF deflate.
> 
> Not a bad suggestion.
> 
> Original                                             424 MB
> DEFLATE without predictor          380 MB 
> DEFLATE with -co predictor=2     280 MB


One more test with LZW

Without predictor                 474 MB
With -co predictor=2              307 MB

Is there something that prevents changing the default to "predictor=2" from
the current default value "1"?

-Jukka Rahkonen-