[GRASSLIST:6426] Re: satellite images

[Markus Neteler]

On Mon, Apr 11, 2005 at 04:52:45PM +0200, Chiara Porcu wrote:
> I all!
> 
> I've imported a satellite image en grass 60, with a resolution of 0.6 m,
> and 16 bits. the problem is that the white/black image is too dark and the
> color one appears just as it was taken in a very foggy day. but when I open
> them in windows it's all ok. can it be a problem of composition? is there
> a way to adjust them on grass? I used r.in.gdal to import the images and
> r.composite to compose them. in a first moment we worked on images of 8 bits
> and, even if the quality wasn't good, it appeared better than now. can it
> be a problem of bits?

To visually improve channels, you can use r.colors (col=aspect does
sometimes a magic improvement). I assume that you are using Quickbird.

If you have all the color and panchromatic channels you can use
i.fusion.brovey to make an image fusion.

Markus