> > I am trying to help a developer how wants to use VRTs as an intermediary > between a GeoRaster and a PNG, in order to produce thumbnails. In that > case, does the VRT needs to describe the mask band so that the PNG's > driver will received the filtered image, with the zeroes regions masked > out?
You need to explicitely declare mask bands in the VRT. See the VRT documentation for that. But that will just declare the existence of the mask band, and will not do any processing such as zeroing masked regions. -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
