Bug report #20721

gdal:warpreproject missing old 'extra' param

Added by Juan Manuel Perez almost 2 years ago. Updated over 1 year ago.

Status:Closed
Priority:High
Assignee:Alexander Bruy
Category:Processing/GDAL
Affected QGIS version:3.5(master) Regression?:Yes
Operating System: Easy fix?:No
Pull Request or Patch supplied:Yes Resolution:fixed/implemented
Crashes QGIS or corrupts data:No Copied to github as #:28541

Description

This issue seems related to #20586.

In QGis 2.18 we were using "gdalogr:warpreproject" passing '-srcnodata {some_value} -dstalpha' as 'extra' param. The processing toolbox allowed setting it using the item 'Additional creation parameters'.
In our case, this 'extra' param was needed to correctly get the transparency on a given raster.

In QGis 3.4 and 3.5(master), this 'extra' argument is not available any more: nor in the dialog opened from the processing toolbox, nor in the arguments shown by processing.algorithmHelp("gdal:warpreproject")

So, with QGis 3 we have lost the availability to pass gdal the extra params -srcnodata and -dstalpha.

Dirty workaround

By the way, we have found and we are using a quite dirty trick to have gdal receive this -srcnodata and -dstalpha parameters. We pass 'options' set with a value such as this:

'COMPRESS=JPEG|JPEG_QUALITY=75|-dummyworkaround -srcnodata {} -dstalpha'

That, just by chance, seems that makes gdal receive a "-co -dummyworkaround" that is ignored, and then the -srcnodata and -dstalpha that we need...

04-12-2018 16:39:19 - gdalwarp -s_srs EPSG:32635 -t_srs EPSG:32635 -r near -ot Byte -of GTiff -co COMPRESS=JPEG -co JPEG_QUALITY=75 -co -dummyworkaround -srcnodata -9999.0 -dstalpha D:\users\jmperez\temp\newTpzLayer7offnjok\tmp_merged_via_virtual_raster.tif D:\users\jmperez\temp\newTpzFilemfoh41a0.tif
04-12-2018 16:39:19 - Warning 6: creation option '-dummyworkaround' is not formatted with the key=value format
04-12-2018 16:39:19 - Creating output file that is 269P x 177L.
04-12-2018 16:39:19 - Processing D:\users\jmperez\temp\newTpzLayer7offnjok\tmp_merged_via_virtual_raster.tif [1/1] : 0...10...20...30...40...50...60...70...80...90...Warning 1: TIFFReadDirectory:Sum of Photometric type-related color channels and ExtraSamples doesn't match SamplesPerPixel. Defining non-color channels as ExtraSamples.
04-12-2018 16:39:19 - 100 - done.

Associated revisions

Revision bb2c3663
Added by Alexander Bruy over 1 year ago

[processing] add optional EXTRA parameter to gdalwarp algorithm (fix #20721)

This allows users to pass additional command-line arguments which are
not exposed in the algorithm definition. The most frequent use case is
enabling transparency and adding nodata values.

Revision f74c280c
Added by Alexander Bruy over 1 year ago

[processing] add optional EXTRA parameter to gdalwarp algorithm (fix #20721)

This allows users to pass additional command-line arguments which are
not exposed in the algorithm definition. The most frequent use case is
enabling transparency and adding nodata values.

(cherry picked from commit bb2c3663b0033269b4720477a809b206d22cd899)

History

#1 Updated by Giovanni Manghi almost 2 years ago

  • Category changed from GDAL Tools to Processing/GDAL
  • Priority changed from Normal to High
  • Assignee set to Giovanni Manghi

#2 Updated by Alexander Bruy over 1 year ago

  • Assignee changed from Giovanni Manghi to Alexander Bruy
  • Pull Request or Patch supplied changed from No to Yes

#3 Updated by Alexander Bruy over 1 year ago

  • Status changed from Open to Closed
  • % Done changed from 0 to 100

#4 Updated by Alexander Bruy over 1 year ago

  • Resolution set to fixed/implemented

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