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. 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. Anyone have thoughts on what the VRT driver is doing? Thanks, Patrick
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