[ncl-talk] WG: WG: extra colors around plotted objects

[Arne Melsom]

...another thought (not sure exactly how to implement this):
You might be able to use white for all values <15 in the plot, and then redefine the color mapping and plot the color bar with the blueish colors separately.

Perhaps someone has an idea about how to make such an approach work?


----- Original Message -----
> OK I guess that you want colors to be interpolated in one interval, but not
> in its complement (the complement being <15).
> 
> I'm not sure if this is possible in ncl using other plot resource options,
> the real experts will know.
> 
> What I guess you could do, is to regrid your array to a finer resolution
> using e.g. bilinear interpolation (see
> https://www.ncl.ucar.edu/Applications/regrid.shtml for examples; perhaps use
> a result which has ~10x as many points in x and y), then reset values <15 to
> 0, and plot the result with e.g. res at cnFillMode = "RasterFill"
> 
> 
> ----- Original Message -----
> > 
> > 
> > 
> > Thank you very much for your quick response Arne. It does work with
> > "CellFill" an "RasterFill"but I do not want the plot to be  pixelated
> > (attached png). Hopefully there is another way to avoid the extra colors
> > and keep the same quality.
> > 
> > 
> > 
> > Paraskevi Giannakaki , PhD student
> > Climate impact group,
> > Institute of Geography, University of Bern
> > Hallerstrasse 12, 5th floor
> > CH-3012 Bern
> > Mail: paraskevi.giannakaki at giub.unibe.ch
> > ________________________________________
> > Von: Arne Melsom [arne.melsom at met.no]
> > Gesendet: Montag, 7. September 2015 13:21
> > An: Giannakaki, Paraskevi (GIUB)
> > Cc: ncl-talk at ucar.edu
> > Betreff: Re: [ncl-talk] WG: extra colors around plotted objects
> > 
> > Hi Paraskevi,
> > Not sure if it helps, but perhaps try including
> >  res at cnFillMode = "RasterFill"
> > or
> >  res at cnFillMode = "CellFill"
> > Regards,
> > Arne
> > 
> > ----- Original Message -----
> > >
> > >
> > > Dear all,
> > >
> > > I want to make a plot using a threshold of 15 (so everything less than 15
> > > is
> > > equal to zero). When I make the plots, around the fileds which survive
> > > the
> > > thresholding process there are colors of the colormap which has to do
> > > with
> > > values less than 15. In the example I send you (GRADPV.png), there are
> > > blue
> > > and skyblue contours around my fields which should not be there. I want
> > > to
> > > keep the entire color-table, so I do not want to change my color scale to
> > > start from 15. Any ideas about what's wrong with the plots and how can I
> > > fix
> > > this?? You will find enclosed my ncl script and the file I used for the
> > > plot.
> > >
> > > Thank you very much in advance for your help!
> > >
> > >
> > >
> > > Paraskevi Giannakaki , PhD
> > > Climate impact group,
> > > Institute of Geography, University of Bern
> > > Hallerstrasse 12, 5th floor
> > > CH-3012 Bern
> > > Mail: paraskevi.giannakaki at giub.unibe.ch
> > >
> > > _______________________________________________
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> > 
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