On mercredi 15 mai 2019 11:17:57 CET Patrick Young wrote: > Hi all, > > I'm experiencing some strange behavior when extracting a mask band using > gdal_translate from a VRT vs the source GTiff at a reduced resolution. I > have a 3 band, 8 bit JPEG compressed (YCbCR) RGB geotiff with an internal > no data mask and with internal overviews. Making a VRT of this and running > > gdal_translate -b mask in.vrt mask.tif > > > Returns the expected no data mask. > > However, if I add in "-outsize 10% 0", I instead get the first band back as > the mask tif rather than the mask band. Any -outsize setting has the same > effect. > > Repeating this with the source geotiff rather than the vrt works as > expected.
For the record, the above issue has been fixed per https://github.com/OSGeo/gdal/pull/2018 > Interestingly, running > > gdalinfo -oo OVERVIEW_LEVEL=1 in.vrt > > reports no mask flags set at all (they are reported without the -oo > option), but running on the original geotiff rather than the vrt does > report the mask flags. > And this point about -oo OVERVIEW_LEVEL is addressed per https://github.com/OSGeo/gdal/pull/2021 Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
