[ncl-talk] plotting RGBA in pdf problem

[sk]

agree,
I hope the ncl-guys here in the forum will make this limitation to be overcome in next release.
Regards,
SK



On Tuesday, September 9, 2014 7:43 PM, Rick Brownrigg <brownrig at ucar.edu> wrote:
 


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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>
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