Hi,
Another way is to add an alpha band to the image. I generally use GIMP
to do this. If the Georeferencer sees and alpha band, then, the border
will use this band.
Nicolas
On 2022-05-24 7:25 a.m., Richard McDonnell via Qgis-user wrote:
Easiest way I can think of doing what you want is to create a VRT of
the three raster’s.
*Raster*è*Miscellaneous* è*Build Virtual Raster*
When you do this set the *Nodata value* to 0 (the default transparent
value form the Georeference Tool)
This should create a merged raster for you and allow you to use the
correct transparency value.
Hope this helps,
Richard
——
Richard McDonnell MSc GIS, FME Certified Professional
/FRM Data Management/
——
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MSc GIS, FME Certified Professional
——
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Office of Public Works
Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
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*From:*Qgis-user <[email protected]> *On Behalf Of
*Lazanu Ciprian-Catalin via Qgis-user
*Sent:* 24 May 2022 11:53
*To:* Uwe Fischer via Qgis-user <[email protected]>; Uwe
Fischer via Qgis-user <[email protected]>
*Subject:* [Qgis-user] Raster
Hello,
I georeferenced three maps ... all good, quite easy by using points
from map canvas. When my map was ready it has a black border (image
1). This is solved by ~Custom transparency options~, and a black
border disappears. But this solution is just temporarily, because if I
close and reopen ... that raster has again a black border. I want to
merge the three maps in one, but it does with a black border between
maps.
A solution to this annoying problem?
Thank you
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<https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing> images
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Nicolas Cadieux
https://gitlab.com/njacadieux
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