layer transparency 'no data value' checkbox setting is not preserved during save/load project

[qgib]

Author Name: Tom Grundy (Tom Grundy)
Original Redmine Issue: 10236
Affected QGIS version: master
Redmine category:project_loading/saving

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for a geoiff (and probably other raster types) the Layer Properties -> Transparency -> No Data Value checkbox setting is not preserved: uncheck the box, save the project, exit qgis, restart qgis, then load the project, and notice the checkbox is checked. This is important when you want black to be opaque but have other custom pixel values that you want to be transparent. The layers in question do not have an alpha channel.

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Related issue(s): #19067 (duplicates)
Redmine related issue(s): 10668

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[qgib]

Author Name: Giovanni Manghi (@gioman)

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Confirmed on master/linux.

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• fixed_version_id was changed from Version 2.2 to Version 2.4
• operating_system was changed from Windows to
• os_version was changed from Vista 32 home basic to
• version was changed from 2.2.0 to master

[qgib]

Author Name: Etienne Tourigny (@etiennesky)

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Actually I am not sure if the no data value settings (and additional nodata value) should be saved in the project, but rather in the .qml file.

[qgib]

Author Name: Etienne Tourigny (@etiennesky)

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fixed in changeset 061941e

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• status_id was changed from Open to Closed

[qgib]

Author Name: Tom Grundy (Tom Grundy)

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please reopen - bug fix seems to be broken - see issue #19067

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• status_id was changed from Closed to Reopened

[qgib]

Author Name: Tom Grundy (Tom Grundy)

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I can confirm that the 'new' bug still exists in QGIS 422148c (just installed)

[qgib]

Author Name: Tom Grundy (Tom Grundy)

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Here's a good workaround: just change the nodata value of the geotiff itself to some safe value. In this case, white is meant to be transparent, so:

gdal_edit.py -a_nodata 255

documented "here":http://www.gdal.org/gdal_edit.html

So - the bug remains but the workaround is acceptable, unless you have a raster that really has no nodata value, since you can't disable the handling of a nodata value in qgis.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• fixed_version_id was changed from Version 2.4 to Future Release - High Priority

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Seems fixed in master. Please reopen if necessary

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• resolution was changed from to fixed/implemented
• status_id was changed from Reopened to Closed