[GRASSLIST:692] Re: patching together aerial photographs

[Maciek Sieczka]

On Wed, 12 Apr 2006 17:27:34 +0200
Jeroen Wortel <j.wortel at wanadoo.nl> wrote:

> I have a series of georeferenced aerial photographs as 8 bit tiff
> files. I have imported these into Grass using r.in.gdal and can
> visualize them with d.rast
> Now I want to patch them together in order to use them in NVIZ as
> color raster.
> 
> Because the images are 8 bit indexed colours I can't use r.patch to 
> patch the images together in one go.
> I suppose I have to split the images first into red, green and blue 
> bands, patch each band together with r.patch, and combine the patched 
> red, green and blue bands again.
> 
> I can't find the Grass command to split the raster image in to red, 
> green and blue rasters. How do I do this in Grass? 

Please read GREY SCALE EQUIVALENTS AND COLOR SEPARATES section in
r.mapcalc manual.

Hope this helps.

Maciek

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