[GRASS-user] Adjust opacity in command line

[Andy Wickert]

Thanks for the answers! (And sorry for the delayed reply - been
traveling). I went for the manual (ImageMagick) option, and that
worked well.
Andy


On Wed, Aug 29, 2012 at 5:37 AM, Hamish <hamish_b at yahoo.com> wrote:
> Andy 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.
>
> for two rasters you can use the d.shadedmap module for a similar effect.
> It's just a wrapper around a trick with the d.his module.
>
> examples:
>   http://grass.osgeo.org/grass63/screenshots/images/fourmaps.jpg
>   http://grass.osgeo.org/grass63/screenshots/images/spearfish_catchements.png
>
> (see raster screenshots on the homepage for scripts that made those)
>
>
> It's a bit limited in what it can be used for, but for the case of a
> categorical area map (maybe 'v.to.rast type=area') over a shaded relief
> DEM it works quite nicely.
>
>
> Hamish