I'm working with indexed color types of raster data (charts). The data is in RGB geotiffs and I'm using gdaladdo to create pyramid layers for them. Unfortunately, the best method for this raster type available using gdaladdo is still pretty bad - much of the linework becomes garbled when viewing the pyramids. The best-looking method that I've been able to come up with is:
gdaladdo.exe --config COMPRESS_OVERVIEW DEFLATE -r average
The Lanczos algorithm method works beautifully when used with other programs - but I need to create .ovr files. gdal_retile.py output looks great - but I can't figure out how to create .ovr files from that output.
Does anybody know of the availability of the Lanczos resampling method for gdaladdo - or of another way to create .ovr files with Lanczos?
Robb _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
