Hi, Are your multigigabyte originals tiled or striped tiffs?
-Jukka Rahkonen- mhw-at-yg wrote > I have a lot of multi GB images that are unfortunately jpeg-in-geotiff > encoded before nodata was properly defined. As a result they all suffer > from > the jagged edges problem. > <http://osgeo-org.1560.x6.nabble.com/file/t192661/WVpPW.png> > > I've defined a method for adding a nodata mask side-car file that works > around this: > https://gis.stackexchange.com/questions/387877/add-a-nodata-mask-or-alpha-band-to-read-only-image/ > > * Create a working copy de-collared image with a mask file > * Rename the mask file to match original > * Remove working copy > > Windows command line syntax: > > ::: > nearblack -o xxx.tif -setmask in_image.tif > move xxx.tif.msk in_image.tif.msk > del xxx.* > ::: > > Unfortunately nearblack is unusable on large images. With a source image > of > 3.9 GB (126015 x 68149 pixels, 3 channels) it was only at 35% after 17 > hours. I forgot about the process and rebooted my machine so I don't know > how long it would taken to complete, if it would have finished at all. > > I used gdal_retile to break the source into 4096x4096 tiles and ran > nearblack on those. It finished in under 2 hours for the entire set of 527 > files, but i can't use the result because the tiles aren't georeferenced > (see other thread). That problem aside, the experiment demonstrates much > optimization is possible. > > Any advice on how else I might solve this? > > > > > > > > ----- > -Matt > -- > Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html > _______________________________________________ > gdal-dev mailing list > gdal-dev@.osgeo > https://lists.osgeo.org/mailman/listinfo/gdal-dev -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
