<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>From the doc page on 'controlling colors': </div><div>When using <span class="red">version 2.0.0+</span> and 'gxout shade2'
or 'gxout shade2b', if any of the color numbers is < 0, the contour
is not drawn at all (i.e., it is effectively transparent). In <span class="red">version 2.1+</span>, the 'set gxout' option 'shaded' is an alias for 'shade2'. </div><div>So if you have 'set clevs 9 10 11 12 13 14 15', add 'set ccols -1 9 14 4 11 5 13 3' (or use your colors of choice) and then no contours with values below 9 will be drawn. </div><div><br></div><div>Alpha values for defined colors were introduced in version 2.1. So you could also define a color to be completely transparent (e.g. 'set rgb 20 1 1 1 0') and that would give you the same result as described above, but there's no need to overcomplicate.</div><div>--Jennifer</div><div><div><br></div><div><br></div><div>On Feb 28, 2014, at 11:12 PM, Jeff Duda wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">I think if you're using version 2.0.2+ you can use alpha values to make the color below the bottom level transparent instead of matching the background. Just display the underlying field first.<div>Jeff</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Feb 28, 2014 at 8:55 PM, Thomas Robinson <span dir="ltr"><<a href="mailto:ter@hawaii.edu" target="_blank">ter@hawaii.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thank you Jeff. I actually have a plot of terrain, and I would like to plot 'var' on top of that with the terrain in the background. So I really want to make a shaded plot overlaid on a shaded plot. Just using a background value won't work for that. It there any way to just eliminate the lower values?<div class="gmail_extra">
<br><br><div class="gmail_quote">On Fri, Feb 28, 2014 at 1:13 PM, Jeff Duda <span dir="ltr"><<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">use the ccols command to manually set the color levels. If you have N contour values, you need N+1 colors, the first one in the list is the color corresponding to values below the lowest contour. Set that to 0 (background), so that it will appear not to color values below your minimum contour value. See the <a href="http://www.iges.org/grads/gadoc/colorcontrol.html" target="_blank">controlling colors</a> section of the documentation index for more information.<div>
<br>Jeff Duda</div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Fri, Feb 28, 2014 at 4:58 PM, Thomas Robinson <span dir="ltr"><<a href="mailto:ter@hawaii.edu" target="_blank">ter@hawaii.edu</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Aloha Grads Users, <div><br></div><div>I am trying to make a shaded plot where values only show up if they are greater than 9. So I do:</div>
<div><br></div><div>set clevs 9 10 11 12 13 14 15</div><div>d val</div>
<div>cbarn</div><div><br></div><div>That works great, but it fills in purple (default) for everything below 9 which is most of the plot. Is there a way to turn off coloring in the areas below 9? </div><div><br></div><div>
Thanks, </div><div>Tom<span><font color="#888888"><br clear="all"><div><br></div>-- <br><div dir="ltr">Tom Robinson<br>President - Graduate Student Organization <br>Chair - Student Athletic Fee Committee <br>
Graduate Student - Department of Meteorology<br>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>
Center for Analysis and Prediction of Storms<br>
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<br></font></span></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Tom Robinson<br>President - Graduate Student Organization <br>Chair - Student Athletic Fee Committee <br>
Graduate Student - Department of Meteorology<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>
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