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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Easiest way I can think of doing what you want is to create a VRT of the three raster’s.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Raster</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">è</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">
<b>Miscellaneous</b> </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">è</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">
<b>Build Virtual Raster</b></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">When you do this set the
<b>Nodata value</b> to 0 (the default transparent value form the Georeference Tool)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">This should create a merged raster for you and allow you to use the correct transparency value.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hope this helps,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Richard<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Qgis-user <qgis-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Lazanu Ciprian-Catalin via Qgis-user<br>
<b>Sent:</b> 24 May 2022 11:53<br>
<b>To:</b> Uwe Fischer via Qgis-user <qgis-user@lists.osgeo.org>; Uwe Fischer via Qgis-user <qgis-user@lists.osgeo.org><br>
<b>Subject:</b> [Qgis-user] Raster<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="RO" style="font-family:"Calibri",sans-serif;color:black;border:none windowtext 1.0pt;padding:0cm;background:white;mso-fareast-language:RO">Hello,</span><span lang="RO" style="color:black;mso-fareast-language:RO"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="RO" style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:RO">I georeferenced three maps ... all good, quite easy by using points from map canvas. When my map was ready it has a black
border (image 1). This is solved by ~Custom transparency options~, and a black border disappears. But this solution is just temporarily, because if I close and reopen ... that raster has again a black border. I want to merge the three maps in one, but it does
with a black border between maps. </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="RO" style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:RO">A solution to this annoying problem? </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNoSpacing" style="text-align:justify;text-indent:2.0cm"><span style="font-family:"Calibri",sans-serif;color:black;border:none windowtext 1.0pt;padding:0cm;background:white;mso-fareast-language:RO">Thank you</span><span style="font-family:"Calibri",sans-serif;color:black"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing" id="LPlnkOWALinkPreview"><span style="font-family:"Calibri",sans-serif">https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing</span></a><span style="font-family:"Calibri",sans-serif;color:black"> images<o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing" target="_blank"><span style="font-size:16.0pt;font-family:"Segoe UI Light",sans-serif;text-decoration:none">Meet Google Drive – One place for
all your files</span></a><span style="font-size:16.0pt;font-family:"Segoe UI Light",sans-serif"><o:p></o:p></span></p>
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<div style="margin-right:6.0pt;margin-bottom:9.0pt;max-height: 100px;overflow:hidden" id="LPDescription286380">
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#666666">Google Drive is a free way to keep your files backed up and easy to reach from any phone, tablet, or computer. Start with 15GB of Google storage – free.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#A6A6A6">drive.google.com<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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