On Sun, 2008-08-03 at 19:32 +0100, Glynn Clements wrote: > Nikos Alexandris wrote: [...] > If you import data which doesn't contain any nulls, then re-export it, > the nodata= option will typically have no effect, as there aren't any > nulls which need to be converted. > > OTOH, if the GRASS raster which you are exporting contains values from > 0 to 255 inclusive, and also contains nulls, that's 257 possible > values. If the format to which you are exporting only has 256 possible > values (i.e. 0 to 255), then you can't avoid losing information.
Thank you Glynn. It just got stuck to my mind that nodata= will convert the 255 values in nodata and not the opposite. So I though that my 255's will go away :-) _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
