4 messages · Uwe Ligges, Roger Bivand, Rainer M Krug
Hi I have a raster which I would like to plot in a greyscale instead of colour. Is this possible, and how? Thanks Rainer
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa
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")'
Uwe Ligges
Thanks Rainer
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
______________________________________________ R-help <at> r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
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)
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 > >
> > ______________________________________________ > R-help <at> r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code. > >
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa