Photoshop's new Harmonize feature excels at compositing objects but struggles with human subjects. This clever workaround uses Harmonize specifically for creating realistic contact and cast shadows when compositing people into new backgrounds. The technique involves adding a fake light source to improve shadow generation, then isolating only the
Read the full article here: Using Photoshop's Harmonize Feature to Create Realistic Shadows for Human Composites Photoshop Roadmap