Bug report #16324
RGB palettes are dropped on export
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: | - | ||
| Category: | Rasters | ||
| Affected QGIS version: | 2.18.4 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | end of life |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 24234 |
Description
When GeoTiff rasters using an RGB palette encoding are exported using "Layer -> Save as", the palette metadata is omitted from the exported file.
Steps to reproduce:- Load the attached palette_example.tif raster
- Export is using "Layer -> Save as" (output mode "raw data", format GeoTiff)
- The exported TIFF will have identical pixel values, but no palette information, so it'll be displayed in "singleband grey" mode.
History
#1
Updated by Giovanni Manghi about 7 years ago
- Status changed from Open to Feedback
save it using the "rendered image" option, you'll get a RGB raster that then you cna converted to palleted with the "rgb to pct" tool. Sounds fair enough?
#2
Updated by Mira Ressel about 7 years ago
Thanks for the tip. I'll admit this is a low-priority bug with many possible workarounds, but it is nevertheless a bug which should be fixed in the long run.
The gdal command-line utilities handle paletted TIFFs just fine, so it's apparently possible to implement this.
#3
Updated by Giovanni Manghi about 7 years ago
- Priority changed from Normal to Low
- Status changed from Feedback to Open
Luis Ressel wrote:
Thanks for the tip. I'll admit this is a low-priority bug with many possible workarounds, but it is nevertheless a bug which should be fixed in the long run.
The gdal command-line utilities handle paletted TIFFs just fine, so it's apparently possible to implement this.
not sure raster "save as" uses gdal at all.
#4
Updated by Mira Ressel about 7 years ago
Giovanni Manghi wrote:
not sure raster "save as" uses gdal at all.
I think so, since the "Save as" dialog offers some GDAL-specific compression settings in the "Create Options" tab.
#5
Updated by Giovanni Manghi about 7 years ago
- Regression? set to No
- Easy fix? set to No
#6
Updated by Giovanni Manghi about 5 years ago
- Resolution set to end of life
- Status changed from Open to Closed
End of life notice: QGIS 2.18 LTR
Source:
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/
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