Convert vector to raster

1. Click the Add raster layer and select the file C:/OSGeo4W64/geodata/raster/s2/Subset_S2A_MSIL2A_20170619T.tif.
2. Click Open, the raster layer appears on the QGIS canvas.
3. Open the raster calculator and apply the following formula:

1. Define path and name for the single band output layer.
2. Click on the ‘OK-button’.