I have a problem combining several rasters into one big raster. Particular annoying is, that I had this problem once before and solved it, but I can't remember how. Unfortunately the other StackExchange-Entries didn't help me either.
I try to combine a set of grayscale rasters using the function Raster>Miscellaneous>Merge. The problem is, that the outputraster always contains gaps, where the novalue areas of one raster overlap the value area of another layer. This Problem seems to appear no matter what settings I choose. Sometimes the merge-function creates an multicolor raster and tries to put the different input rasters into different colorbands. In any case I dont get the wanted result. Does anybody know this problem and remember how to get rid of it?