Opened 17 years ago
Closed 16 years ago
#443 closed enhancement (fixed)
No Data Value for three band images
| Reported by: | Owned by: | ersts | |
|---|---|---|---|
| Priority: | major: does not work as expected | Milestone: | Branch - Raster Transparency |
| Component: | Rasters | Version: | 0.8 |
| Keywords: | raster no data | Cc: | |
| Must Fix for Release: | No | Platform: | All |
| Platform Version: | all | Awaiting user input: | no |
Description
A common kludge for three band satellite images is to reserve either 0,0,0 or 255,255,255 for no data. Many satellite images have significant background data. To mosaic images effectively requires a mechanism to make the nodata areas transparent.
Attachments (1)
Change History (6)
by , 17 years ago
| Attachment: | QGIS images with no data.png added |
|---|
follow-up: 2 comment:1 by , 17 years ago
| Platform Version: | Mac OS X 10.4.8 → all |
|---|
see also my wish: https://svn.qgis.org/trac/ticket/441
comment:2 by , 17 years ago
Replying to cavallini@faunalia.it:
see also my wish: https://svn.qgis.org/trac/ticket/441
A more general proposal would certainly be preferred. Transparency is not handled elegantly within scientific systems. As formats, PNG and TIFF do about the best for RGB images. My preference within QGIS would be to set the value for each band as a metadata/symbology property. Old school but simple and independent of raster format.
comment:3 by , 17 years ago
| Milestone: | Version 0.8 Release → Version 0.9 Release |
|---|
comment:4 by , 16 years ago
| Awaiting user input: | unset |
|---|---|
| Milestone: | Version 0.9.1 → Branch - Raster Transparency |
| Owner: | changed from to |
This is being addresses in the raster transparency branch and is largely completed. Feedback on the modification in the branch from the original poster of this ticket would be great.
comment:5 by , 16 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
screen shot of mosaicked images