I know you are beyond this stage but if you check the* Use 0 for transparency when needed* box in the georeferencer settings it will not have the black box when you georeference. [image: image.png]
On Wed, May 25, 2022 at 10:14 AM Nicolas Cadieux via Qgis-user < qgis-user@lists.osgeo.org> wrote: > 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* > > —— > Oifig na nOibreacha Poiblí > Office of Public Works > > Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 > Jonathan Swift Street, Trim, Co Meath, C15 NX36 > —— > M +353 87 688 5964 T +353 46 942 2409 > https://gov.ie/opw > > —— > To send me files larger than 30MB, please use the link below > https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie > > Email Disclaimer: > https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ > > —— > MSc GIS, FME Certified Professional > > —— > Oifig na nOibreacha Poiblí > Office of Public Works > > Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 > Jonathan Swift Street, Trim, Co Meath, C15 NX36 > —— > M +353 87 688 5964 T +353 46 942 2409 > https://www.opw.ie > > —— > Email Disclaimer: https://www.opw.ie/en/disclaimer/ > > *From:* Qgis-user <qgis-user-boun...@lists.osgeo.org> > <qgis-user-boun...@lists.osgeo.org> *On Behalf Of *Lazanu Ciprian-Catalin > via Qgis-user > *Sent:* 24 May 2022 11:53 > *To:* Uwe Fischer via Qgis-user <qgis-user@lists.osgeo.org> > <qgis-user@lists.osgeo.org>; Uwe Fischer via Qgis-user > <qgis-user@lists.osgeo.org> <qgis-user@lists.osgeo.org> > *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 > > > https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing > images > > Meet Google Drive – One place for all your files > <https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing> > > Google Drive is a free way to keep your files backed up and easy to reach > from any phone, tablet, or computer. Start with 15GB of Google storage – > free. > > drive.google.com > > > > _______________________________________________ > Qgis-user mailing listqgis-u...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > -- > Nicolas Cadieuxhttps://gitlab.com/njacadieux > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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