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Hi,<br>
Just looking into this, but you might try whats outlined here<br>
<br>
<a class="moz-txt-link-freetext" href="https://gis.stackexchange.com/questions/166699/replacing-rgb-value-0-0-0-with-nodata-nodata-nodata-in-gdal">https://gis.stackexchange.com/questions/166699/replacing-rgb-value-0-0-0-with-nodata-nodata-nodata-in-gdal</a><br>
<br>
Warp, can be found under <b>Raster</b>, <b>Projections</b>,<b>
Warp </b>fill in the fields just as you done before for the
Translate, with the exception of the nodata field.<br>
<br>
At the bottom where you see the GDAL script being constructed, you
should also see a Pencil or Pen icon, select this, it will allow you
to directly edit the script.<br>
You should paste <i><b>-srcnodata "0,0,0" -dstnodata "0,0,0" </b></i>just
after<i><b> -overwrite </b></i>so as you have something like below<i><b>.<br>
<br>
</b></i>gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0"
-of GTiff raster_in.tif raster_out.tif<br>
<br>
Hope this helps.<br>
<br>
Regards,<br>
<br>
Richard.<br>
<br>
<br>
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<div class="moz-cite-prefix">On 15/08/2017 13:42, Brett Adams wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Richard,<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">Thanks for your
response. Gave this a run but it’s not quite working.<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">Looks like the
problem stems from the colour being defined across three
bands, with black defined by 0,0,0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><br>
</span><span style="color:#1F497D"><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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">When “No data =
0” this clears all colours where band 1 = 0. Which includes
a lot more colours than just black.<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">Tried entering
a few different formats to cover the all 3 bands but the
second 2 are always ignored.<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">Any thoughts as
to how I get 3 bands recognised?<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">Brett<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-AU"
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-AU"
lang="EN-US"> Qgis-user
[<a class="moz-txt-link-freetext" href="mailto:qgis-user-bounces@lists.osgeo.org">mailto:qgis-user-bounces@lists.osgeo.org</a>] <b>On Behalf
Of </b>Richard McDonnell<br>
<b>Sent:</b> Monday, 14 August 2017 10:16 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] background transparency<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Brett, <br>
Apologies, ive just realised your version of QGIS may not have
the processing toolbox.<br>
You may also do this by going to <b>RASTER</b>, <b>Conversion
</b>and selecting<b> Translate </b>Its the very same tool
just a different interface<br>
Regards,<br>
<br>
Richard<o:p></o:p></p>
<div>
<p class="MsoNormal">On 14/08/2017 15:04, Richard McDonnell
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Brett<br>
You can indeed, just use the Processing toolbox, just type
Translate into the search box and select the Translate Tool
under GDAL.<br>
The values you specified as transparent, can be specified
under the Nodata Value<br>
You can also do this as part of a batch if you have a number
of files, you wish to do this for.<br>
<br>
Hope this helps,<br>
<br>
Richard.<o:p></o:p></p>
<div>
<p class="MsoNormal">On 14/08/2017 14:07, Brett Adams wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi Folks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have a geotiff that contains a black
ground in areas where there is no data. The black
background is made transparent within QGIS via “Layer
Properties – Transparency”<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Can I export a new Geotiff with the
black background removed?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I’m running 2.6.1 On Windows-7. Yes,
I know it’s an old version but I’ve had no reason to
update. So far…<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span
style="color:#C00000;mso-fareast-language:EN-AU">Brett
Adams</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="color:#C00000;mso-fareast-language:EN-AU">Spinifex-GPX</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="color:#C00000;mso-fareast-language:EN-AU">0438
861 974</span></b><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:EN-AU"><br>
<br>
<br>
<o:p></o:p></span></p>
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<br>
<b><u>Richard McDonnell</u></b><br>
</span><b><span
style="font-size:7.5pt;font-family:"Times New
Roman","serif";mso-fareast-language:EN-AU">GIS
Specialist PgD GIS AssocSCSI</span></b><span
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<b><u>Richard McDonnell</u></b><br>
<b><small><small><small>GIS Specialist PgD GIS AssocSCSI</small></small></small></b><br>
<b><small>OPW FRM Data Management</small></b><br>
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