[R] How to plot raster obtained from readRAST6 in grey scale?

[Rainer M Krug]

Thanks - I was quite in a rush when writing the question - sorry about that.

But it works now with

image(TheImage, col=gray.colors(10, start=0.9, end=0.3)


On 08/03/2008, Roger Bivand <Roger.Bivand at nhh.no> wrote:
> Uwe Ligges <ligges <at> statistik.tu-dortmund.de> writes:
>
>  >
>  >
>  > Rainer M Krug wrote:
>  > > Hi
>  > >
>  > > I have a raster which I would like to plot in a greyscale instead of
>  > > colour. Is this possible, and how?
>  >
>  > Probably, and we may tell you how given you tell us what "raster" means:
>  >
>  >  > ?raster
>  > No documentation for 'raster' in specified packages and libraries:
>  > you could try 'help.search("raster")'
>
>
> It is possible that this is a spatial object, like a digital picture, so the
>  function or method used may have been image(), and the relevant argument was
>  col=. It would help greatly if the question was rendered in R:
>
>  "I have an object X:
>
>  str(X, max.level=1, give.attr=FALSE)
>
>  which I would like to plot in a greyscale instead of colour:
>
>  image(X)
>
>  Which arguments to method "image" should I use?"
>
>  However, re-phrasing answers the question to ?image and probably then to "Where
>  are greyscale colours?" then to help.search("grey") so to gray.colors?, and
>  avoids the posting altogether.
>
>  If the method is spplot in package sp, the same would hold. In any case, for
>  spatial data (raster is a rather spatial incantation) the R-sig-geo list might
>  be more suitable.
>
>  Roger
>
>  >
>  > Uwe Ligges
>  >
>  > >
>  > > Thanks
>  > >
>  > > Rainer
>  > >
>  >
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>  >
>
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>


-- 
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT)

Plant Conservation Unit Department of Botany
University of Cape Town
Rondebosch 7701
South Africa