Hi,
Just looking into this, but you might try whats outlined here
https://gis.stackexchange.com/questions/166699/replacing-rgb-value-0-0-0-with-nodata-nodata-nodata-in-gdal
Warp, can be found under *Raster*, *Projections*,*Warp *fill in the
fields just as you done before for the Translate, with the exception of
the nodata field.
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.
You should paste /*-srcnodata "0,0,0" -dstnodata "0,0,0" */just
after/*-overwrite */so as you have something like below/*.
*/gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -of GTiff
raster_in.tif raster_out.tif
Hope this helps.
Regards,
Richard.
On 15/08/2017 13:42, Brett Adams wrote:
Richard,
Thanks for your response. Gave this a run but it’s not quite working.
Looks like the problem stems from the colour being defined across
three bands, with black defined by 0,0,0
When “No data = 0” this clears all colours where band 1 = 0. Which
includes a lot more colours than just black.
Tried entering a few different formats to cover the all 3 bands but
the second 2 are always ignored.
Any thoughts as to how I get 3 bands recognised?
Brett
*From:*Qgis-user [mailto:[email protected]] *On Behalf
Of *Richard McDonnell
*Sent:* Monday, 14 August 2017 10:16 PM
*To:* [email protected]
*Subject:* Re: [Qgis-user] background transparency
Brett,
Apologies, ive just realised your version of QGIS may not have the
processing toolbox.
You may also do this by going to *RASTER*, *Conversion *and
selecting*Translate *Its the very same tool just a different interface
Regards,
Richard
On 14/08/2017 15:04, Richard McDonnell wrote:
Hi Brett
You can indeed, just use the Processing toolbox, just type
Translate into the search box and select the Translate Tool under
GDAL.
The values you specified as transparent, can be specified under
the Nodata Value
You can also do this as part of a batch if you have a number of
files, you wish to do this for.
Hope this helps,
Richard.
On 14/08/2017 14:07, Brett Adams wrote:
Hi Folks,
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”
Can I export a new Geotiff with the black background removed?
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…
Thanks
*Brett Adams*
*Spinifex-GPX*
*0438 861 974*
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TEL: 01 6476543
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*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
*52 Stephens Green, Dublin 2.*
TEL: 01 6476543
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