[Qgis-user] background transparency

[Richard McDonnell]

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:qgis-user-bounces at lists.osgeo.org] *On Behalf 
> Of *Richard McDonnell
> *Sent:* Monday, 14 August 2017 10:16 PM
> *To:* qgis-user at lists.osgeo.org
> *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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>     -- 
>     *_Richard McDonnell_*
>     *GIS Specialist PgD GIS AssocSCSI*
>     *OPW FRM Data Management*
>     *52 Stephens Green, Dublin 2.*
>     TEL: 01 6476543
>
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> *_Richard McDonnell_*
> *GIS Specialist PgD GIS AssocSCSI*
> *OPW FRM Data Management*
> *52 Stephens Green, Dublin 2.*
> TEL: 01 6476543
>

-- 
*_Richard McDonnell_*
*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
*52 Stephens Green, Dublin 2.*
TEL: 01 6476543
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