A fair reference-photo comparison for browser face swaps

A reference photo can make a face-swap demo look convincing in one frame, yet that frame says little about what happens when the subject moves. Compare permitted photos as a small experiment: change one input at a time.

Keep the scene fixed

Use the same webcam, distance, room light and preview size. Select reference images you have permission to use, with a visible face and similar framing. A front-facing portrait and a dark profile shot are not a fair comparison.

Repeat one motion sequence

With a browser-based live swap face preview, repeat the same short sequence for each reference: look straight ahead, turn gently left and right, smile, then bring a hand briefly near the face. Watch the hairline, jaw, eyes and mouth in motion. A strong still frame can hide a weak transition.

Keep a test log

Record the reference photo, lighting, motion, visible artifacts and delay. If one photo improves a head turn but worsens expressions, keep both observations instead of choosing a winner from a screenshot. Check any credits or usage limits before a long session.

The current browser preview is what this test measures; do not assume it already works as a virtual camera in meeting software. For public use, obtain the subject's consent and disclose that the image is synthetic.

Disclosure: I work on Live Swap Face. The comparison method also applies to other face-swap previews.