<div dir="ltr"><div>Hi Will,</div><div><br></div><div>Offhand, I would think you could set up a custom colormap that consisted of RGBa tuples, which were all the same value for the 1st 3 components, and only the opacity (alpha) channel varied. Something like:</div><div><br></div><div> myColors = new((/100,4/_, float) ; colormap of 100 values</div><div> do i=0,99</div><div> mColors(i,:) = (/ 0., 0., 1., i / 100. /) ;; transparent to solid blues<br></div><div> end do</div><div><br></div><div>Then set either cnFillPalette or cnFillColors to "myColors"</div><div><br></div><div> <a href="http://ncl.ucar.edu/Applications/rgbacolor.shtml">http://ncl.ucar.edu/Applications/rgbacolor.shtml</a></div><div><br></div><div>Hope that helps...</div><div>Rick</div><div><br></div><div> <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 25, 2021 at 12:43 AM Will Hobbs via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11pt">Hi all<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I suspect the answer is ‘no’, but is it possible to set multiple values for cnFillOpacity?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I’d like to plot an overlay that has a single fill color, but uses opacity as it’s ‘colourmap/contour level’.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I can see a way of doing this by looping through each contour level and setting explicit levels/opacities each time, but I wonder if there’s a more efficient way.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">Will<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11pt;color:black">Will Hobbs <u></u>
<u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Arial",sans-serif;color:black"><u></u> <u></u></span></p>
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