Which practice is essential when shooting with a green screen for compositing?

• A. Place subject directly on the screen.
• B. Light the screen evenly to avoid spill and shadows, separate subject from background, minimize color spill, shoot with proper distance, ensure accurate camera settings, and key in post with clean matte edges.
• C. Overexpose to hide spill.
• D. Ignore spill and color balance.

Answer: (B)

Shooting with a green screen for compositing hinges on creating a clean, removable background by controlling lighting, distance, and camera settings so the keying software can generate a precise matte.

Light the screen evenly to avoid spill and shadows, separate the subject from the background, minimize color spill, shoot with proper distance, ensure accurate camera settings, and key in post with clean matte edges. Uniform illumination across the green surface prevents bright or dark patches that complicate keying; shadows on the screen become hard-to-remove artifacts. Keeping the subject at a proper distance from the screen reduces green spill onto the subject and helps produce crisper edges. Minimizing color spill protects the subject’s edges from being tinted by the green, which improves key accuracy. Proper distance also helps the keying algorithm distinguish subject from background. Accurate camera settings—especially white balance, exposure, and color consistency—prevent color casts and clipping that would hamper the key. Finally, in post, refining the matte edges and performing spill suppression yields a cleaner composite with smoother edges.

Oversimplifying by overexposing to hide spill, ignoring spill and color balance, or placing the subject directly on the screen all lead to poorer keys and more work later, so they’re not effective practices.