Brett,
There appears to be nothing wrong with those examples, if there where,
you would be informed anyway!
Another approach try this /*gdal_calc.py -A input.tif
--outfile=result.tif --calc="A*(A>0)" --NoDataValue=0
*/This supposes of course, you are familiar with command line GDAL!
Might I suggest another solution, It will only work with other QGIS
users, but If you, in Properties, save your style as default, it will
create a default qgis style with the same name as the raster. When you
send it along with the raster, or anyone opens the raster, where the
style is in the same location, the raster will always open as you require.
Without having a subset of your dataset to play with Im sorry, I cant be
of any more help!!
Regards,
Richard.
On 16/08/2017 03:32, Brett Adams wrote:
Hi Richard,
Trialled your suggestion and others contained in the
gis.stackexchange.com link. Always get the same result where if any
of the three bands contain a 0, it’s removed.
Maybe I’ve got the syntax slightly wrong?
*Original *
gdalwarp -overwrite -s_srs EPSG:28351 ""C:/Brett.tif"
*Trialled variations*
gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -s_srs
EPSG:28351 -of GTiff "C:/Brett.tif" "C:/Brett2.tif"
gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -of GTiff
"C:/Brett.tif" "C:/Brett2.tif"
gdalwarp -overwrite -srcnodata None -dstnodata None -dstalpha -s_srs
EPSG:28351 -of GTiff "C:/Brett.tif" "C:/Brett2.tif"
Brett
*From:*Richard McDonnell [mailto:[email protected]]
*Sent:* Tuesday, 15 August 2017 11:17 PM
*To:* Brett Adams; [email protected]
*Subject:* Re: [Qgis-user] background transparency
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] <mailto:[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
--
*_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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