Ok, thanks, good to know. -- oyvind
On Wed, Apr 4, 2012 at 3:24 PM, Dmitry Baryshnikov <poli...@mail.ru> wrote: > 04.04.2012 16:57, Oyvind Idland написал: > > How do I get overviews to work with VRT datasets ? > > What I do is > - creating a .vrt with additional alpha band + nodata using gdalbuildvrt > (wrapping an existing TIFF) > - creating overviews using gdaladdo. I then get an external .ovr file. > - creating a new TIFF from the VRT > > First, it seems that the .vrt does not get updated, as there is no > <Overview> tags. I then tried to manually add <Overview> for each band, > but the output TIFF does not have overviews in it.. just the original > bitmap and a mask for it. > > Example: > > gdalbuildvrt _r-32-2-4776-64728.vrt -overwrite -addalpha -srcnodata 0 > -vrtnodata 0 r-32-2-4776-64728.tif > > gdaladdo _r-32-2-4776-64728.vrt 2 4 8 16 32 64 > > gdal_translate -of GTiff -co COMPRESS=JPEG -co JPEG_QUALITY=80 -co > PHOTOMETRIC=YCBCR -b 1 -b 2 -b 3 -mask 4 -co COPY_SRC_OVERVIEWS=YES > --config GDAL_TIFF_INTERNAL_MASK YES _r-32-2-4776-64728.vrt > output\r-32-2-4776-64728.tif > > > Also, I tried to add overviews embedded inside the source tiff (wrapped in > the same .vrt), but still no overviews in the output. > > Note, that what I'm really trying to do, is to create TIFF with JPEG > compression, and adding a mask that is not "contaminated" with jpeg > artifacts. > > What am I doing wrong ? :) > > > -- oyvind > > > _______________________________________________ > gdal-dev mailing > listgdal-dev@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/gdal-dev > > This is the bug and I'm working to fix it. > I think this bug are mentioned in such tickets > http://trac.osgeo.org/gdal/ticket/2076 and > http://trac.osgeo.org/gdal/ticket/3482 > > Regards, > Dmitry > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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