[GRASSLIST:3227] Re: Missing 'output' in d.his (& d.shadedmap)

[Glynn Clements]

Karine ZUERCHER wrote:

> > > Until Grass5beta11, I used to create shaded maps with d.shadedmap tcltk
> > > module, but with grass5.0.0pre3 I realized I could no longer write an
> > > output map. In fact it is the d.his module that no longer has an optional
> > > output option.
> >
> > This functionality is now provided by r.his. r.his creates separate
> > R/G/B output layers; you can use r.composite to generate a composite
> > colour layer if you need to (although I'm not aware of any situation
> > where this is required).
> 
> Actually, I need it to get a shaded raster map...

What I meant is that I don't know of any situation where a colour
image *has* to be represented as a single composite colour layer. For,
anything that can be done with a composite layer, there should be an
equivalent process which works with separate R/G/B layers, except that
using separate layers will result in higher quality.

E.g.

display		d.rast		->	d.rgb
print		ps.map "raster"	->	ps.map "rgb"
export		r.out.ppm	->	r.out.ppm3
import		r.in.ppm	->	r.in.ppm -b

> Thanks for the typ, although it's a longer way, it works fine.
> 
> Still, if possible, I would suggest the reput the d.his  (& d.shadedmap) 
> output option !

The old behaviour was largely a result of the fact that d.his used to
generate a composite colour version of the data for output; the
"output=" option just saved data which was already being generated.

d.his was changed to use the RGB raster functions (R_RGB_raster()
etc), as this produces better output. So, it no longer generates the
data which was being saved by the "output=" option.

-- 
Glynn Clements <glynn.clements at virgin.net>