Backlight

What this is about

Backlight solves a problem of depth. A camera flattens a room, so a dark-haired actor in front of a dark wall merges into it; a rim along hair and shoulder pulls them forward again. Unlike the key it contributes nothing to facial exposure, and unlike fill it does not lift shadows — it draws a line. The gaffer must keep it out of the lens, which usually means a flag or a matte box shade, and the level is judged by eye rather than metered on the face.

A term only helps when everyone on set means the same thing by it — so what follows is how it is used, not a dictionary definition.

What runs differently here

In planning terms, that means:

• Placed directly behind the subject it becomes a kicker or rim; offset to three quarters back it also models the cheekbone.
• Backlight almost always needs flagging, since a source pointed at the camera will veil the whole frame.
• Blonde hair takes a fraction of the level dark hair needs; the same lamp position can be two stops apart between actors.

With TillyGen

TillyGen's lighting notes list the backlight as its own unit, so the extra stand, cable and rigging minutes show up in the day's setup time.

Change one constraint and the consequences travel through the whole plan: affected shots are flagged, the call sheet is regenerated, and nobody keeps working from yesterday's version.