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So I geo-referenced a few scanned maps successfully, however when it orients the scanned map correctly, a black rectangle background appears behind the map. This doesnt allow for me to "puzzle" together different maps because the black background lays on top of other scanned map portions. I was wondering if there's a way to crop out that background while obviously keeping the map part intact and correctly oriented/geo-referenced.

  • Cropping is not the right way. You must make the black rectangles transparent with nodata, alpha channel, or mask layer. – user30184 Feb 24 '16 at 15:38
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You can use gdal_translate to crop georeferenced images.It is available in QGIS from the raster menu/Extraction/Clipper or from the command line.

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