Hi Jim,
The quickest test I would use with r.colors is to take a simple raster map
with a single category and with r.colors do this:
r.colors map c=rules
1 brown
end
Next, look at the rgb value placed for the brown in the $LOCATION/colr/map file
.
(brown is 191:127:63)
For a tan, you'll probably add values to green. Try 191:177:163 (add 50 to
green). Redisplay the map to check your results. Once you like the tan you've
developed, go to your original multi-category raster map and:
r.colors map c=rules
0 black (if you want it black)
brown
tan
end
Another somewhat longer route would be to use d.colors where you can
interactively change rgb values. Hope this helps. Rick
On 12 Nov 1995, James A Theriault wrote:
I've been playing with coloring rasters lately. Essentially, I'd
like to re-color a map using tan through to dark brown colors
in order to overlay rasters using other colors. I't apparent
that I can do this using r.colors and specifying the type to
be "rules."The difficulty that I've run into is finding a set of RGB values
for a tan-to-brown color scale. Does anyone have any suggestions
where to get a set of values that I can start with?
------------------------------------------------------------------------
Rick Thompson- Research Specialist E-mail: rick@cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-8498
Ozark Hall Rm. 12 Fax: (501) 575-5218
University of Arkansas
Fayetteville, AR 72701