Hello and thanks, Hamish, for the answer
After thinning my image with r.thin, I described my thinned raster r.describe rasterThin >* 1 The white parts of my image seemed to be * I launched r.reclass input=rasterThin output=rasterReclass > 1=NULL > *=1 black But I got everything equal to NULL=>blank image.. So, I recalculated my map so as to replace NULL values by 0 value. r.mapcalc if(isnull(rasterThin), 0, rasterThin) Then, i processed it with r.to.vect Then, I cleant the result with the snap and prune tools -- Just one question: r.describe rasterThin gave me >* 1 Did "*" mean "everything else than 1" or everything? Why did I get a blank/NULL map? Thanks a lot! -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/beginner-r-to-vect-v-polygonizing-only-white-parts-of-an-image-tp5103294p5107720.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
