[GRASS-user] Is mosaicing 24 bit images possible in Grass 6.2?

[Moritz Lennert]

On 03/07/08 14:35, Nagesh Bhatkar wrote:
> Dear all,
> 
> I intend to mosaic two 24 bit images in LAT LON location.
> I imported a 24 bit coloured PNG image in Grass using r.in.gdal in an 
> x-y location.
> GRASS treated it as a combination of three 8 bit images, one for red, 
> one for green,
> and one for blue and imported them as three separate maps.
> 
> After going through the archives, I tried to use r.patch to combine all 
> the three components.
> The output of which wasn't a 24bit image but was only one of the 
> components. (Not coloured)
> 
> d.rgb module does display a coloured 24 bit image after inputing the 
> three components to it.
> 
> I geocoded them to get non-coloured 8 bit geocoded images in the target 
> location.
> 
> I did the same for the second 24 bit image.
> Mosaicing works fine(i.image.mosaic), but i need to use 8 bit images(24 
> bit images converted to 8 bit images prior to importing, using xv; 
> resolution weak)
> or any one of the 8 bit components of a 24 bit image.
> 
> Is there a way to mosaic 24 bit images and to output it as a single 24 
> bit image?

r.composite (Raster->Manage map colors->Create RGB)

Moritz