Re: problem with contour transparency

Hi Micah,
Your diagnosis is correct. The problem is that transparency is not possible with RasterFill contouring (prior to NCL 6.1.0) , for reasons I won't go into here. This has always been documented. The background color is substituted. You can use transparent (-1) as a color index if you set the fill mode to AreaFill or CellFill. If that doesn't work for you then you will need to upgrade your NCL version. Even with 6.x NCL, you will not be able to set the transparent color using -1 for a raster fill plot. Instead you need to use a 4-tuple RGBA value. We are hoping to fix this issue by the next release.
 -dave

On Mar 7, 2013, at 4:48 PM, Micah Sklut wrote:

> Hello,
>
> I am having a problem with my Map Fill showing under my countour.
> My best guess is that the "transparent" color is not showing, but instead white is overlaying the map fill. I've attached an image showing my output.
>
> Below is the maping call and basic res.
> Thank you for any suggestions.
> PS. I'm using version 4.3.1 and I know I'm supposed to upgrade!
>
> contour = gsn_csm_contour_map_ce(wks,prec(i,:,:),res)
>
> Here's the basic res:
> res = True
>
> res@gsnAddCyclic = False
>
> res@mpFillOn = True
> res@mpLandFillColor = 2
> res@mpOutlineBoundarySets = "NoBoundaries"
>
> res@tmYROn = False
> res@tmYLOn = False
> res@tmXBOn = False
> res@tmXTOn = False
> res@tmYRBorderOn = False
> res@tmYLBorderOn = False
> res@tmXBBorderOn = False
> res@tmXTBorderOn = False
>
>
> res@lbLabelBarOn = False
> res@lbTitleOn = False
>
> res@gsnPaperOrientation = "portrait"
> res@gsnMaximize = True
> res@gsnLeftString = ""
> res@gsnRightString = ""
>
> res@gsnDraw = False
> res@gsnFrame = False
>
> res@cnLevelSelectionMode = "ExplicitLevels"
> res@cnLevels = (/.00001,.00002,.00005,.00008,.0001,.0003,.0007,.001,.003,.005/)
> res@cnFillColors = (/-1,6,7,8,9,10,11,12,13,14,15/)
> res@cnFillMode = "RasterFill"
> res@cnFillOn = True
> res@cnLinesOn = False
> res@cnLineLabelsOn = False
>
>
> --
> Micah Sklut
>
> <contour.png>_______________________________________________
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Received on Thu Mar 7 15:30:42 2013