Relightful Video Portrait Harmonization

Figure 1. We present HarmoVid, a relightable video harmonization framework that aligns lighting between foreground and background. Given a foreground video with masks and a target background video, HarmoVid leverages a video diffusion model to directly synthesize a harmonized output. It produces realistic, temporally consistent results that accurately match foreground color, intensity, and shadows to the background while preserving both foreground and background content.