On Tue, Aug 28, 2012 at 4:19 PM, Glynn Clements <gl...@gclements.plus.com> wrote: > > Andy Wickert wrote: > >> I have been trying to find a way to adjust the opacity (or >> transparency, to throw another key word in there) of raster and vector >> layers using the command line. This is possible in the wxPython GUI, >> but I have a large number of maps to produce, and would like to script >> it. So if anyone knows if this is possible with the standard d.* >> commands, ps.map, or something else I don't know about - thanks in >> advance! > > It isn't possible to directly generate images with partial opacity. > wxGUI (via g.pnmcomp) uses the opacity values when compositing the > layers to form the displayed image. > > You'll need to use general-purpose image-processing tools such as > ImageMagick, netpbm or Python+PIL. Blending between an empty > (fully-transparent) image and the source image is probably the easiest > approach.
Perhaps "r.blend" could be of interest to some extent. Markus _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
