On 05/12/2011 12:40, Giovanni Manghi wrote:
On Mon, 2011-12-05 at 01:15 -0800, pieri70 wrote:Hello Jürgen which kind of compressed raster do you use instead of ECW (if you use any..??tryGeoTIFF TILED=YES COMPRESS=JPEG QUALITY=75 and overviews. cheers Has anyone worked with 12 bit jpeg compression for GeoTiffs ? I did a quick test (i.e. un-professional, just by viewing the results...) and it looked very good. Almost indistinguishable from the original tif. And the size reduction is about 85-90%. Compared with ECW or MrSid (95% compression) that's pretty good. Much better than any of the regular compression options. A specially compiled GDAL [1] can support reading and compressing GeoTiff to 12 bit jpeg, but the format is not well supported by other software, so this is a chicken and egg thing. [1] http://trac.osgeo.org/gdal/wiki/TIFF12BitJPEG -- Giovanni -- _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System.
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