White Balance
A camera setting that calibrates color rendering so white objects appear white under any light source.
White Balance
noun | Camera & Optics
A camera setting that compensates for the color temperature of the dominant light source in a scene, adjusting the sensor's color channel gains so that objects that are physically white or neutral gray are rendered as white or neutral gray in the recorded image. Without white balance correction, images recorded under tungsten light appear amber-orange and images recorded under cool daylight appear blue. White balance removes this color cast, calibrating the image to a neutral color baseline.
Quick Reference
| Unit | Kelvin (K) - color temperature scale |
| Domain | Camera & Optics |
| Also Used In | Post-Production (color correction and grading) |
| Common Values | 3200K (tungsten), 4300K (fluorescent), 5600K (daylight), 6500K (overcast), 10000K (blue sky) |
| Setting Methods | Preset (tungsten/daylight), Kelvin dial, auto white balance (AWB), custom white balance (gray card) |
| Native Balance | ARRI ALEXA: 5600K; most digital sensors are least sensitive to blue, requiring more blue gain under tungsten |
| Related Terms | Color Temperature, Gel, Available Light, ISO, Exposure |
| See Also (Tools) | Exposure / Shutter / Focal Length Calculator |
| Difficulty | Foundational |
The Explanation: How & Why
Light sources do not all produce the same color of light. A tungsten lamp produces light heavily weighted toward red and orange wavelengths, perceived as warm amber light. Midday sunlight is weighted toward the middle of the spectrum with more blue, perceived as neutral white. An overcast sky produces even more blue. A candle flame sits at approximately 1800K. These differences are described using the Kelvin scale of color temperature, a physical measure of the color of light emitted by a heated black body at a given temperature.
The human visual system corrects for color temperature automatically. A sheet of white paper looks white under tungsten light, under daylight, and under a fluorescent tube because the brain adjusts its color perception to compensate. A camera sensor does not do this automatically. It records the actual color of the photons hitting each pixel. Without correction, the image reflects the true color of the light source: warm under tungsten, cool under daylight.
White balance is the camera's equivalent of the brain's chromatic adaptation. By adjusting the relative gain of the red, green, and blue color channels, the camera boosts the channels that the light source is deficient in and reduces the channels it is dominant in. Set to 3200K, the camera boosts blue relative to red, correcting for tungsten's warmth. Set to 5600K, it applies a more neutral gain ratio appropriate for daylight.
The practical consequence of incorrect white balance is a color cast that is difficult to fully correct in post if the footage is not shot in RAW. A scene shot at 3200K white balance under 5600K daylight will have a strong blue cast across every frame. If shot in a compressed codec (ProRes, H.264), correcting this in post stretches the color channels and can introduce noise, particularly in the blue channel where digital sensors are least sensitive.
For RAW capture (ARRIRAW, RED RAW, Sony X-OCN), white balance is stored as metadata rather than baked into the pixel data. The colorist adjusts white balance in the grade with no quality loss. This is why RAW workflows allow the DP to set an approximate white balance on set and refine it later. However, even with RAW, the on-set white balance affects the monitor image, which affects lighting and exposure decisions made during the shoot.
Historical Context & Origin
Color temperature correction in film photography was managed through two methods: using film stocks balanced for specific light sources, and placing physical correction filters over the lens or light sources. Tungsten-balanced film (Type B, balanced for 3200K) was the standard for interior studio production. Daylight film (Type D, balanced for 5500K) was used for exterior work. Color correction filters - blue 80A/80B for converting tungsten to daylight balance, amber 85B for converting daylight to tungsten balance - were placed over the lens or over windows and light sources.
Digital sensors replaced this system with electronic white balance. The ARRI ALEXA, introduced in 2010, quotes a native white balance of 5600K, meaning the sensor applies the least total gain at that setting. Under tungsten light at 3200K, the sensor requires significant blue gain, which can introduce noise in dark, saturated blue areas of the image. This is rarely a practical problem but explains why some DPs prefer to light with daylight-balanced sources (5600K LEDs) even on interior sets.
Modern LED fixtures have further changed white balance practice. Bi-color LED panels (such as the Aputure Nova P300c or ARRI SkyPanel S60-C) allow instant color temperature adjustment from 2000K to 20000K, eliminating the need for physical gels in many situations. Suzie Lavelle, DP of Normal People (2020), famously shoots at 4300K - halfway between tungsten and daylight - allowing practical lamps to read warm while daylight sources read cool, creating a naturalistic mixed-light aesthetic that would have been considered an error in earlier decades.
How It's Used in Practice
Scenario 1 - Interior Tungsten Setup (DP / Gaffer): A scene is lit entirely with tungsten fixtures (ARRI 650W Fresnels, 1K open-face units). The DP sets the camera white balance to 3200K to match the light source. A white piece of paper placed in the scene reads as white on the monitor. Skin tones render naturally. The gaffer confirms all fixtures are tungsten-balanced. No gels are needed on the lights. The DP shoots in ARRIRAW, knowing the white balance can be refined in the grade if needed.
Scenario 2 - Mixed Light Correction (DP / Gaffer): An interior scene has a window letting in 5600K daylight on one side and a 3200K tungsten practical lamp on the other. The DP sets white balance to 4300K as a compromise: the daylight side reads slightly cool, the tungsten side reads slightly warm. The gaffer offers to add CTB (color temperature blue) gel to the tungsten lamp to convert it to 5600K, allowing a single 5600K white balance. The DP prefers the mixed-light look and keeps the 4300K setting.
Scenario 3 - Daylight Exterior (DP / 1st AC): An exterior scene is shot at midday under clear sky. The DP sets white balance to 5600K. As the shoot extends into late afternoon, the color temperature drops as the sun warms. The DP adjusts the Kelvin dial to 4800K to compensate for the warmer light, maintaining consistent skin tones across the afternoon's coverage. The 1st AC notes each white balance change in the camera report for the colorist's reference.
Usage Examples in Sentences
"We are at 3200K. Make sure every light on set is tungsten-balanced or gelled to match."
"The white balance is off. Everything has a blue cast. Check if someone bumped the Kelvin dial."
"Shoot RAW and you can fix white balance in post. But get it close on the day so the monitor tells you the truth."
"She shoots at 4300K to let the practicals go warm. It is a deliberate aesthetic choice, not a mistake."
Common Confusions & Misuse
White Balance vs. Color Temperature: Color temperature is a physical property of a light source, measured in Kelvin. White balance is a camera setting that compensates for that property. A tungsten lamp has a color temperature of 3200K. The camera's white balance is set to 3200K to correct for it. The two terms describe related but different things: one describes the light, the other describes the camera's response to the light.
White Balance vs. Color Grading: White balance is a technical calibration performed on set or at the start of the color pipeline. Color grading is a creative process that develops the film's look. White balance establishes the neutral baseline. Color grading builds the aesthetic on top of that baseline. A film can be correctly white-balanced and then creatively graded to look warm, cool, or stylized.
Auto White Balance (AWB) in Narrative Production: AWB continuously analyzes the scene and adjusts color balance between shots and sometimes within shots. This creates inconsistent color that makes matching shots in the grade difficult. AWB is appropriate for documentary, event coverage, and run-and-gun work where lighting changes unpredictably. It is generally avoided in narrative production where consistency and control are paramount.
Variations by Context
| Context | How White Balance Practice Varies |
|---|---|
| Narrative Film | Set manually to a fixed Kelvin value or preset. Maintained consistently across the scene. Adjusted only when the light source changes. RAW capture allows post-refinement. |
| Documentary / Run-and-Gun | AWB is acceptable because lighting conditions change unpredictably and there is no time for manual calibration. Some DPs use a fixed 5600K or 4300K as a baseline. |
| Commercial / Advertising | Set precisely using a gray card or color checker (X-Rite ColorChecker Passport). Color accuracy is critical for product representation and brand color matching. |
| Music Video / Stylized | White balance may be intentionally set "wrong" for creative effect. Setting 3200K under daylight creates a blue look; setting 5600K under tungsten creates an orange look. |
Key People & Films
Suzie Lavelle, DP of Normal People (2020), established a signature look by shooting at 4300K, allowing practical lamps to read warm against cool daylight - a technique now widely adopted in contemporary drama. Roger Deakins regularly works with daylight-balanced LED sources on ARRI ALEXA cameras, setting 5600K as his baseline on films including 1917 (2019) and Blade Runner 2049 (2017). Bradford Young's cinematography on Arrival (2016) used deliberate white balance choices to create the film's cool, clinical aesthetic, with the DP setting specific Kelvin values to achieve the intended mood rather than correcting to neutral.
Equipment / Tools Reference
The ARRI ALEXA 35 offers white balance from 2000K to 20000K with manual Kelvin entry. The Sony VENICE 2 supports 2000K to 15000K. The RED V-Raptor ranges from 1700K to 100000K. For on-set white balance calibration, the X-Rite ColorChecker Passport provides reference gray and color patches. Gray cards (18% reflectance) are used for custom white balance readings. Bi-color LED fixtures - the Aputure Nova P300c (2000K to 10000K) and ARRI SkyPanel S60-C (2800K to 10000K) - allow instant color temperature adjustment without gels. Color temperature meters like the Sekonic C-800 measure the exact Kelvin value of any light source on set.
Standards & Specifications
The Kelvin scale is the international standard for color temperature measurement, defined by the International Bureau of Weights and Measures (BIPM). The CIE (International Commission on Illumination) defines color temperature and correlated color temperature (CCT) for light sources that do not perfectly match a black body radiator. The two standard color temperatures for film and video lighting are 3200K (tungsten) and 5600K (daylight), established through decades of industry convention. SMPTE standards for digital cinema (ST 428-1) define the XYZ color space for theatrical projection, which is independent of white balance but depends on correct white balance during capture. The Academy Color Encoding System (ACES) defines a standardized color pipeline that treats white balance as metadata in the input transform stage.
Common Questions / FAQ
Q: Can you fix white balance in post-production?
A: If you shot RAW (ARRIRAW, RED RAW, Sony X-OCN), yes - white balance is metadata and can be adjusted freely in the grade with no quality loss. If you shot a compressed codec (ProRes, H.264, H.265), the white balance is baked into the pixel data. You can correct it, but stretching the color channels introduces noise and reduces dynamic range, particularly in the blue channel.
Q: What Kelvin value should I use for outdoor shooting?
A: 5600K is the standard baseline for daylight. On an overcast day, 6500K is more accurate. During golden hour (sunrise or sunset), the color temperature drops to approximately 3000K to 4000K. The exact value changes continuously as the sun moves. For consistency across coverage, many DPs pick one value and hold it, accepting a slight warm shift as the sun lowers.
Q: What is the difference between white balance and color temperature?
A: Color temperature is a physical property of the light source, measured in Kelvin. White balance is the camera setting that compensates for that property. A tungsten lamp has a color temperature of 3200K. You set the camera's white balance to 3200K to correct for it. One describes the light; the other describes the camera's response.
Q: Should I use auto white balance on a film set?
A: Generally no, for narrative work. AWB changes between shots and sometimes within shots, creating inconsistent color that is difficult to match in the grade. Set a fixed white balance manually and change it only when the light source changes. AWB is acceptable for documentary and event work where lighting is unpredictable.
Related Terms
- Color Temperature - The physical property of light measured in Kelvin that white balance compensates for
- Gel - Physical filters (CTB, CTO) used to convert light sources between color temperatures before white balance was electronic
- Available Light - Existing light sources that the DP must white-balance to rather than control
- ISO - A separate camera setting that affects exposure; often confused with white balance by beginners but operates on a completely different axis
- Exposure - The amount of light reaching the sensor; white balance affects color rendering, not exposure
- LUT - Look-up tables applied in post that work on top of the white balance baseline established on set
See Also / Tools
Use the Exposure / Shutter / Focal Length Calculator to plan your exposure settings alongside white balance. Getting both correct on the day saves significant time in the grade. For the theory behind how color temperature affects your image, see the Color Temperature and Gel glossary entries.
