[GRASS-dev] d.his vs. r.his

[Hamish]

> Hamish wrote:
> > I am trying to recreate the 'd.his brighten=' effect with r.his, but
> > with r.his along with the brightness I get extremely high contrast
> > output.

Glynn:
> You're forgetting the colour tables. Twice.
> 
> First, r.mapcalc needs to use the intensities for elev.shad_relf, not
> its values.
> 
> Second, r.his uses the intensities for elev.shad_relf_bright50, not
> its values. As you aren't setting a colour table, you get the default
> rainbow colours.
> 
> Try this instead:
> 
> 	r.mapcalc 'elev.shad_relf_bright50 = #elev.shad_relf * 1.5'
> 	r.colors elev.shad_relf_bright50 color=grey255
> > r.his h=elevation.dem i=elev.shad_relf_bright50 r=esr.r g=esr.g b=esr.b
> 	d.rgb r=esr.r g=esr.g b=esr.b
> 
> It gives results similar to d.his.


Yes, right, thanks. I think I need to read a book on advanced color theory
someday.


Hamish


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