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<p>Hi,</p>
<p><br>
</p>
<p>Another way is to add an alpha band to the image. I generally
use GIMP to do this. If the Georeferencer sees and alpha band,
then, the border will use this band.<br>
</p>
<p><br>
</p>
<p>Nicolas<br>
</p>
<div class="moz-cite-prefix">On 2022-05-24 7:25 a.m., Richard
McDonnell via Qgis-user wrote:<br>
</div>
<blockquote type="cite"
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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>
<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
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<span style="FONT-FAMILY: Arial, sans-serif;
FONT-WEIGHT: bold; COLOR: #004d44"><br>
——</span><br>
<span style="FONT-FAMILY: Arial, sans-serif;
FONT-WEIGHT: bold; COLOR: #004d44">Richard McDonnell
MSc GIS, FME Certified Professional</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
#004d44"><i>FRM Data Management</i></span><br>
<br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
#004d44">——</span><br>
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Poiblí</span><br>
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<br>
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FONT-WEIGHT: bold; COLOR: #565148">Sráid Jonathan
Swift, Baile Átha Troim, Co na Mí, C15 NX36
</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
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NX36</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
#565148">——</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
#565148">M +353 87 688 5964 T +353 46 942 2409</span><br>
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Certified Professional</span><br>
<br>
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Swift, Baile Átha Troim, Co na Mí, C15 NX36
</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
#565148">Jonathan Swift Street, Trim, Co Meath, C15
NX36</span><br>
<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
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<span style="FONT-FAMILY: Arial, sans-serif; COLOR:
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<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Qgis-user
<a class="moz-txt-link-rfc2396E" href="mailto:qgis-user-bounces@lists.osgeo.org"><qgis-user-bounces@lists.osgeo.org></a>
<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
<a class="moz-txt-link-rfc2396E" href="mailto:qgis-user@lists.osgeo.org"><qgis-user@lists.osgeo.org></a>; Uwe Fischer via
Qgis-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user@lists.osgeo.org"><qgis-user@lists.osgeo.org></a><br>
<b>Subject:</b> [Qgis-user] Raster<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black;border:none
windowtext
1.0pt;padding:0cm;background:white;mso-fareast-language:RO"
lang="RO">Hello,</span><span
style="color:black;mso-fareast-language:RO" lang="RO"> </span><span
style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:RO"
lang="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
style="font-family:"Calibri",sans-serif;color:black;mso-fareast-language:RO"
lang="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" moz-do-not-send="true"><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>
<div>
<div
style="margin-top:12.0pt;margin-bottom:12.0pt;max-width:
800px;min-width: 424px"
id="LPBorder_GTaHR0cHM6Ly9kcml2ZS5nb29nbGUuY29tL2RyaXZlL2ZvbGRlcnMvMXFNMV9UZUZVbmc5LXh5UlhSUUN1TXJFTXd4RmVKVjduP3VzcD1zaGFyaW5n">
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style="width:100.0%;border:solid #C8C8C8 1.0pt"
width="100%" cellpadding="0" border="1">
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27.0pt 9.0pt 9.0pt" width="100%" valign="top">
<div
style="margin-right:6.0pt;margin-bottom:9.0pt"
id="LPTitle286380">
<p class="MsoNormal"><a
href="https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing"
target="_blank" moz-do-not-send="true"><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>
</div>
<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
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</div>
<div id="LPMetadata286380">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
</div>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<pre class="moz-signature" cols="72">--
Nicolas Cadieux
<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></pre>
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