<div dir="ltr">You should be able to just add a fourth value to your RGB triplets to make them RGBA (A for alpha) quadruplets. Since you already divide the numbers out of 255, you can simply add the alpha on the same scale, with 0 = transparent and 1=opaque (or 255, in your case).<div>
<br></div><div>More of the problem is that you don't seem to be assigning the color array you create at the beginning of the script to the cnFillColors resource you set later on. Look at some of the examples on the NCL website discussing how to work with the new color capabilities at: <a href="http://www.ncl.ucar.edu/Applications/rgbacolor.shtml">http://www.ncl.ucar.edu/Applications/rgbacolor.shtml</a></div>
<div><br></div><div><br></div><div>Kyle</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr">----------------------------------------<div>Kyle S. Griffin</div><div>Department of Atmospheric and Oceanic Sciences</div>
<div>University of Wisconsin - Madison</div><div>Room 1421</div><div>1225 W Dayton St, Madison, WI 53706</div><div>Email: <a href="mailto:ksgriffin2@wisc.edu" target="_blank">ksgriffin2@wisc.edu</a></div></div></div>
<br><br><div class="gmail_quote">On Thu, Aug 28, 2014 at 8:44 PM, Rabah Hachelaf <span dir="ltr"><<a href="mailto:hachelaf@sca.uqam.ca" target="_blank">hachelaf@sca.uqam.ca</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"><div class="gmail_quote"><br><div dir="ltr">Hi all ,<div><br></div><div>I am using the script below to plot humidity between 40-70%(green) and 70-100% (orange).</div><div><br></div><div>I want to know if i can set the opacity for each color for example opacity 50% for the green color and 100% for the orange. </div>
<div><br></div><div>Thanks for help.</div><div><br></div><div><div>;************************************************</div><div>load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" </div><div>load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl" </div>
<div>load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl" </div><div>;************************************************</div><div>begin</div><div> a = addfile("gfs.t00z.pgrb2f00.grib2","r")</div>
<div> lon = a->lon_0</div><div> lat = a->lat_0</div><div> icing = short2flt(a->RH_P0_L100_GLL0({50000},:,:))</div><div><br></div><div>print(icing(1:4,1:4))</div><div>;********************************************************</div>
<div>; Display parameters</div><div>;***************************************</div><div>zoom="test"</div><div>pixel=2048</div><div>;***************************************************</div><div><br></div><div>wks_type="png"</div>
<div><br></div><div> wks_type@wkWidth = pixel</div><div> wks_type@wkHeight = pixel</div><div> wks_type@wkBackgroundOpacityF = 0.0</div><div>wks = gsn_open_wks(wks_type,"icing_test")</div><div><br></div><div>
colors = (/ (/255,255,255/),(/0,0,0/),(/255,255,255/), (/244,255,244/), \</div><div> (/217,255,217/), (/163,255,163/), (/106,255,106/), \</div><div> (/43,255,106/), (/0,224,0/), (/0,134,0/),(/255,145,0/),\</div>
<div> (/255,178,102/) /) * 1.0 ; we multiply by 1 to make colors float</div><div><br></div><div>colors = colors/255.</div><div><br></div><div> </div><div>gsn_define_colormap(wks,colors)</div><div><br></div>
<div>
<br></div><div>res = True</div><div> res@mpProjection = "Mercator" ; choose projection</div><div> res@mpGridAndLimbOn = False ; turn on lat/lon lines</div><div> res@mpPerimOn = False ; turn off box around plot</div>
<div> res@mpFillOn = False</div><div> res@mpOutlineOn = True </div><div> res@cnFillOn = True ; color plot desired</div><div> res@cnLineLabelsOn = False ; turn off contour lines</div>
<div> res@mpLimitMode = "LatLon"</div><div> res@mpMinLatF = -85.0</div><div> res@mpMaxLatF = 85.0 </div><div> res@mpMinLonF = -180</div><div> res@mpMaxLonF = 180</div>
<div> res@vpXF = 0 ; make plot bigger</div><div> res@vpYF = 1 </div><div> res@vpWidthF = 1</div><div> res@vpHeightF = 1</div><div><br></div><div>res@cnLevelSelectionMode = "ExplicitLevels" ; set explicit contour levels</div>
<div>res@cnLevels = (/ 40,70,100/)<span style="white-space:pre-wrap"> </span>; set levels</div><div>res@cnFillColors = (/ -1,5,11/)</div><div><br></div><div>;res@cnFillOpacityF=0.5</div></div><div> <br clear="all">
<div>contour0 = gsn_csm_contour_map(wks,icing,res) ; create the plot<span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888">-- <br><div dir="ltr"><div>------------------------------</div>
Cordialement,<br>Best regards,<br>Rabah Hachelaf <br> <br><br></div>
</font></span></div></div><span class="HOEnZb"><font color="#888888">
<br></font></span></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><div>------------------------------</div>Cordialement,<br>Best regards,<br>Rabah Hachelaf <br></div>
</font></span></div>
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