[GRASSLIST:9659] Re: real color landsat images

[Markus Neteler]

On Sun, Dec 25, 2005 at 01:19:23PM +0000, Glynn Clements wrote:
> 
> Wolfgang Zillig wrote:
> 
> > I know how to combine the band (_10, _20, _30) to real color images
> > with r.rgb. But then the resolution is limited to 30m. Is there a way
> > to get them in higher resolution with the pan band (_80)? When I use
> > i.fusion.brovey I get always false color pictures. Any idea?
> 
> One option to try is rgb.hsv.sh, replace V with the panchromatic map,
> then hsv.rgb.sh.

It is important to change to the _80 resolution before replace V
with the panchromatic map.
 
> Hmm; those scripts don't appear to be included in 6.1, but they are in
> 5.3.

Naive question: What about
 i.his.rgb
 i.rgb.his
?

> Better still, go through YUV instead of HSV; the calculations are
> simpler. The coefficients can be found at:
> 
> 	http://en.wikipedia.org/wiki/YUV
> 
> The equations can be implemented in r.mapcalc easily enough.
> 

Markus