White Balance

White balance is a camera adjustment that compensates for the color temperature of the ambient light, ensuring that the camera's rendering of white objects in the frame matches human color perception — which automatically adapts to different light sources so we perceive white as white regardless of whether we're under tungsten bulbs (warm orange light) or overcast daylight (cool blue light). Camera sensors don't have this automatic adaptation; without white balance correction, footage shot under warm tungsten light will have an orange tint, and footage shot under cool fluorescent or daylight will have a blue-green tint. White balance adjusts the camera's color response to counteract this tint.

White balance is measured in Kelvin (K) — the color temperature unit that describes how warm or cool a light source is. Candle flames are approximately 1,800K (very warm). Tungsten/halogen bulbs are approximately 3,200K (warm orange). Daylight is approximately 5,500–6,500K (neutral to slightly cool). Overcast daylight is approximately 7,000–8,000K (cool blue). Setting the camera's white balance to match the Kelvin value of the ambient light source neutralizes the color cast: setting the camera to 3,200K under tungsten light tells the camera to add blue to counterbalance the orange of the source, producing neutral white rendering. Auto white balance (AWB) allows the camera to measure and adjust this automatically, while manual white balance allows the operator to set a specific Kelvin value for consistent color across a shoot.

White balance consistency is a significant concern in multi-camera and multi-location video productions. If camera A is set to 5,600K and camera B is set to 4,800K while shooting the same subject under the same light, the footage from the two cameras will appear different colors even though they were shooting the same scene. Matching white balance between cameras, and maintaining consistent white balance throughout a shoot day (not switching between AWB and manual or changing the manual setting between setups), ensures that footage assembles in editing with consistent color that doesn't require heavy correction to match. For single-camera productions, white balance consistency is achieved by shooting in manual white balance mode with a value matched to the primary light source at the beginning of each setup, and confirming that value hasn't drifted before stopping recording.