[Qgis-user] Raster

[Lazanu Ciprian-Cătălin]

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
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