I am trying to hillshade 30m SRTM geotiff. The result is terrible. I know that these rasters normally come with geographical coordinates and i have to reproject it before i apply hillshade because there may be problems with the elevation units. This is the result. The elevation units are the same (meters). My projected coordinate system is WGS 1984 Mercator. As you can see the resolution is awful.I have done before this step with other rasters and results have been correct.