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<p class="MsoNormal"><span style="color:#1F497D">You should be able to create an image with just the two polygon layers that is transparent. I think you do something like:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Set IMAGECOLOR (e.g. background) to, say, white…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Draw your first polygon layer…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Draw your second polygon layer in white…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Save to a transparent format…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">That would give you the basically the difference between the polygon layers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Basques, Bob (CI-StPaul)
<br>
<b>Sent:</b> Monday, December 02, 2013 11:30 AM<br>
<b>To:</b> Lime, Steve D (MNIT); mapserver-users@lists.osgeo.org<br>
<b>Subject:</b> RE: Transparent (OPACITY) color(S)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Steve,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">No way to apply the color transparency on the very end huh? Actaully I have two separate layers, the BASE, aerial layer, and the two polygon layers (in OpenLayers/GeoMoose), each
with their own MapFile. I want to render the Lake and islands, then as a last step, change the color of the island fill to transparent(image alpha), to see through to the underlying base layer (Separate image in the browser), seems like it should be possible
somehow.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">What about running through MapServer twice? Render objects, then do a raster color transparency, painful, but should work.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">I can combine the data, but they are from different sources and I would need to update things regularly, trying to automate it all.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Bobb<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Lime, Steve D (MNIT)
<br>
<b>Sent:</b> Monday, December 02, 2013 11:22 AM<br>
<b>To:</b> Basques, Bob (CI-StPaul); <a href="mailto:mapserver-users@lists.osgeo.org">
mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> RE: Transparent (OPACITY) color(S)<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">I don’t believe this has ever been possible. If I understand you, the rendering order is:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:60.75pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Draw aerial photo<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:60.75pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Draw lake<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:60.75pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Draw islands (i.e. holes) in lake<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Step 2 has already mucked with pixels that you’re drawing (again) in step 3. You’d need to combine the lake and islands into multi-part polygons to get the affect you’re after.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:mapserver-users-bounces@lists.osgeo.org">mapserver-users-bounces@lists.osgeo.org</a> [<a href="mailto:mapserver-users-bounces@lists.osgeo.org">mailto:mapserver-users-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Basques, Bob (CI-StPaul)<br>
<b>Sent:</b> Monday, December 02, 2013 11:14 AM<br>
<b>To:</b> <a href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> [mapserver-users] Transparent (OPACITY) color(S)<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">All,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Last week I was trying to set a color to transparent in a mapfile, but it wasn’t working the way I expected.
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">I have a polygon layer, on top of an Aerial Photo base, let’s call it a lake, with a single poly in it. I have another polygon layer with what we’ll call
Islands, I want to color fill the lake and apply the transparent color to the islands AFTER rendering to see through the filled lake poly to the underlying aerial layer. I tried all sorts of combinations of TRANSPARENT, OPACITY, OUTPUTFOMAT, etc. in the MAP
and /or the LAYER elements without success. I recall this used to be possible with older versions of MapServer. But now it seems that OUTPUTFORMAT has been brought into the equation for recent versions.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Hmm, maybe I’m trying to cheat things too much, or I need to read up on NEW Mapserver some more. :c)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Anyone have an example of MAPFILE for accomplishing this.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Thanks<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Bobb<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
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