[ncl-talk] plotting RGBA in pdf problem

[Rick Brownrigg]

Hi,

Unfortunately, this is a known problem -- this color-compositing technique
only works for the image-based output formats, not the document-based
formats (ps, pdf, eps).  I thought this was documented, but the only place
I see it mentioned is in the code for example #9 at:

http://ncl.ucar.edu/Applications/rgbacolor.shtml

This limitation should be noted a bit more prominently.

Rick

On Tue, Sep 9, 2014 at 4:30 AM, sk <sdk0084 at yahoo.com> wrote:

> Hi,
> I have problem to output my figure correctly in pdf (only red layer is
> visible, see below) but everything is fine if i output on screen or in png
> format.
> the following pieces of the code shows how i create the plot
>
> ;---Construct RGBA colormaps...
>   ramp   = fspan(0., 1., 255)
>   reds   = new((/255, 4/), float)
>   greens = new((/255, 4/), float)
>   blues  = new((/255, 4/), float)
>   reds   = 0
>   greens = 0
>   blues  = 0
>   reds(:,0)   = ramp
>   greens(:,1) = ramp
>   blues(:,2)  = ramp
>   reds(:,3)   = 1.
>   greens(:,3) = 0.
>   blues(:,3)  = 0.
> wks = gsn_open_wks("pdf","../figures/"+prefix)
>
>  ......
>     sres at lbLabelBarOn          = False
>     sres at cnFillMode            = "RasterFill"
>     sres at cnLevelSelectionMode  = "EqualSpacedLevels"
>     sres at cnMaxLevelCount       = 254
>     sres at cnFillBackgroundColor = (/ 1., 1., 1., 1./)
>     sres at cnFillColors = greens
>     greenMap = gsn_csm_contour(wks, g, sres)
>     sres at cnFillColors = blues
>     blueMap = gsn_csm_contour(wks, b, sres)
>     sres at cnFillColors             = reds
>     plots(ri,0) = gsn_csm_contour_map(wks, r, sres)
>     overlay(plots(ri,0), greenMap)
>     overlay(plots(ri,0), blueMap)
>     draw(plots(ri,0))
> ........
>     gsn_merge_colormaps(wks,"MPL_gist_yarg","precip3_16lev")
>     dres = res           ;up to here: resources for filled contours
> without thickmarks
> .....
>     plots(ri,1)   = gsn_csm_contour_map(wks,pcp,dres)
>     plot_w1 = gsn_csm_vector(wks,u,v,vres)
>     plot_p  = gsn_csm_contour(wks,emi,eres)
>     overlay(plots(ri,1), plot_w1)
>     overlay(plots(ri,1), plot_p)
>     draw(plots(ri,1))
> ....
>
> Is it ncl limitation or i have to do something more?
> Regards,
> sk
>
>
>
>
>
>
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