I have a raster of roads saved from a WMS, this a multiband raster. Its red(main) an grey(back) roads.
When using the raster calculator I can select most of the red road by using:
Band@1 > 200
But what expression is to be used to select the grey road?
At all grey colours, the 3 bands have the same value. My guess was that this would work, but it did not:
Band@1 = Band@2 = Band@3.
I have tried a couple of other variants, but no success.