VFX Techniques: Crowd Replication with After Effects

Simulate a large crowd using live-action footage of a small group of people, 3D renders, and Photoshop artwork.VFX Techniques introduces common yet critical visual effects techniques that are used in film and television shows on a regular basis. This installment shows how to simulate a large crowd by combining live-action footage of a small group of people, 3D renders, and Adobe Photoshop artwork—transforming an otherwise empty building into a rapt audience. Author Lee Lanier uses After Effects to set up image sequences, apply motion tracking to match the motion of the original camera, and key green-screen footage. Finally, you'll learn how to make all the elements cohesive with color correction and lighting techniques. Topics include: Setting up your project Removing camera jitter Motion tracking CG renders Creating light effects Keying with Keylight Solving bad matte edges Rotoscoping green screen footage Color grading to match elements Relighting the scene