[GRASS-user] How to set layer opacity in maps created from command line? (Nikos Alexandris)

[Nikos Alexandris]

Gregory Penn wrote:

> > I think that r.blend may accomplish what I need, in terms of compositing
> > rasters to achieve the effect of partial transparency in a layer. It is
> > not clear to me how this will work when one or more of the layers that I
> > want to composite has rgb channels and so is represented by three separate
> > raster maps (one for each channel) in the mapset.

Nikos Alexandris wrote:
 
> You can utilise r.composite, in first place, to compose Real- or
> Pseudo-RGBs. <http://grass.osgeo.org/grass64/manuals/r.composite.html>. Try
> to find an optimum for your RGBs (friends: r.colors, i.landsat.rgb).

Check also this set of instructions: 
<http://casoilresource.lawr.ucdavis.edu/drupal/node/159>.

Nikos