As recommended by Paul Ramsey, tiled schema is a better option, so I add it to gdal_translate command.
Thanks! a. Reading ECW and compressing to JPG (set your favourite quality, 80 is a good choice for orthoimages; also CACHEMAX could be increased): gdal_translate --config GDAL_CACHEMAX 1000 --config GDAL_PAM_ENABLED NO -of GTIFF -co COMPRESS=JPEG -co TILED=YES -co JPEG_QUALITY=80 -co PHOTOMETRIC=YCBCR "source_image.ecw" "target_image.tif" b. Adding internal pyramids/overviews with JPG compression (select your resampling method, I prefer average): gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL -r average "image.tif" 2 4 8 16 32 64 128 2015-08-04 17:23 GMT+02:00 Steve Golden <[email protected]>: > If you have access to Windows XP and can install GDAL, gdal_translate is > the > way to go to convert ECW to something else and GeoTIFF should be on your > list for that something else. There are a lot of webpages out there with > sample gdal_translate commands, but I recommend reading about GeoTIFF > compression > < > http://blog.cleverelephant.ca/2015/02/geotiff-compression-for-dummies.html > > > from a very good source. > > -Steve > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/How-to-convert-ECW-using-open-source-packages-into-something-else-tp5218390p5218484.html > Sent from the Quantum GIS - User mailing list archive at Nabble.com. > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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