Stefano, I think that is expected. You can read a little more about it and a recommended work around (VRT) here, http://trac.osgeo.org/gdal/wiki/UserDocs/GdalWarp#GeoTIFFoutput-coCOMPRESSisbroken
Bests, Eli >> The problem arise if I insert the options -co COMPRESS=LZW at the >> warping. The process end successfully but the resulting geotiff is 6 >> times the size of the original one! >> _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev