Redshift profiles in a Schwarzschild space-time for a disc with Keplerian velocity (solid lines) or radially infalling (dashed lines) seen face-on (left panel) or with inclination i = 163° (right panel). The r, φ coordinates are those of the emission point of the photon. On the left panel, the emitted intensity with fiducial parameters and θ_B = const (dotted line) and its corresponding redshifted profiles (teal curves) are also traced.