NickS wrote > I have a very simple georeferenced tif image file - it has about 8 > different colour categories, which represent numeric ranges. How can I > convert the colours (which are in RGB format) into a raster, or better > still into a polygonised vector file?
Raster -> Conversion -> RGB to PCT will convert an RGB image to a one-band indexed (paletted) image. You should be able to polygonise this by going Raster -> Conversion -> Polygonize. I haven't checked but it might even be possible to polygonise the image directly, without converting it to PCT first. N. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Extract-colour-categories-from-tif-file-tp5032291p5032411.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
