New answers tagged ecw
You are selecting your image in the tool dialogbox (not just in the layer TOC? I ask because, unlike other Grass tools, it is not quite so obvious. Alternatively you could use gdalinfo. You get to this tool via Raster->Miscellaneous->Information. Select your raster and then click the little yellow pencil to edit the gdalinfo commandline options. It ...
It's highly inefficient to merge mosaic using gdal merge. Instead, make a VRT (Virtual Dataset) and convert it to your favourite format.
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