[GRASSLIST:73] Re: d.rgb question

[Markus Neteler]

On Fri, May 16, 2003 at 11:03:21PM +0100, Glynn Clements wrote:
> 
> Kirk R. Wythers wrote:
> 
> > > You need to set the colors to grey scale for the three maps test.1,
> > > test.2 and test3.
> > > 
> > > ie. r.colors map=test.1 golor=gray
> > > etc
> 
> Actually, you should use color=rules, e.g.
> 
> 	GRASS:~ > r.colors map=test.1 color=rules
> 	Enter rules, "end" when done, "help" if you need it.
> 	Data range is 0 to 255
> 	> 0 black
> 	> 255 white
> 	> end
> 	Color table for [test.1] set to rules
> 
> This will ensure that 0 is black and 255 is white.
> 
> Using color=gray will map the lowest existing category to black and
> the highest existing category to white; if the map doesn't use the
> entire 0-255 range, you will get the wrong result.
>

Right - sorry for the r.colors mistake in my previous mail.
The updated r.in.gdal applies above suggested fixed color table.

Markus Neteler