raster overlay

[Pat Luther]

Alberto:

The colors will change when adding layers together using r.mapclac.  This
is because the values of each layer are added together (where they overlay)
and this results in new & different values.  You are overlaying correctly.

Pat Luther

At 10:27 AM 12/3/96 +0000, you wrote:
>Hello
>  I'd like to know how can I create a raster file by an overlay 
>between some other. I tried using r.mapcalc with "+" but the result had
>changed colors. 
>Thanks for help
>Alberto Giorgi
>
>
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