Understanding White Balance and Colour Temperature — Complete Photography Guide

White balance is the camera setting that determines how colours are rendered — specifically, whether white objects appear truly white in the final image. Every light source has a colour temperature, measured in Kelvin (K), and the human brain automatically compensates for these shifts so a white shirt looks white whether you're standing in warm candlelight or cool shade. Cameras need to be told which colour temperature they're dealing with — and when they guess wrong, the entire image shifts orange, blue, or green. This guide explains colour temperature, white balance settings, how to correct white balance in-camera and in post, and why it matters critically in wedding and portrait photography.

What Is Colour Temperature?

Colour temperature describes the warmth or coolness of a light source, measured in Kelvin:

• 1800-2700K — Candlelight: deep orange-amber. The warmest common light source. Candle-lit receptions produce extremely warm tones.
• 2700-3200K — Tungsten / incandescent bulbs: warm orange-yellow. Traditional light bulbs in hotels, chandeliers, and older venues.
• 3500-4100K — Fluorescent: varies enormously — can be warm, neutral, or greenish depending on the tube type. Reception halls, community spaces, and older buildings often use fluorescent lighting.
• 4800-5500K — Midday daylight: neutral white. The reference point for "normal" colour rendering.
• 5500-6500K — Overcast sky: slightly cool. Clouds act as a diffuser but also shift colour temperature toward blue.
• 6500-8000K — Open shade: distinctly cool blue. Subjects in shade receive light reflected from the blue sky, not direct sunlight.
• 8000-10000K — Blue hour / twilight: very cool blue-violet. The sky after sunset bathes everything in deep blue tones.

White Balance Settings Explained

Auto White Balance (AWB)

The camera analyses the scene and attempts to neutralise colour casts automatically. Modern cameras are remarkably good at this in simple lighting — but AWB fails in several common wedding scenarios:

• Mixed lighting: a room with tungsten chandeliers and daylight from windows confuses AWB. The camera can't correct for two different colour temperatures simultaneously.
• Intentionally warm scenes: AWB often overcorrects candlelight, removing the warm, romantic amber that makes candle-lit images special. It neutralises the very warmth that defines the mood.
• Consistency between frames: AWB recalculates for every shot. Two images taken seconds apart may have slightly different colour rendering, making batch editing and consistent colour across a gallery more difficult.

Preset White Balance

Cameras offer presets for common lighting conditions:

• Daylight (≈5200K): for outdoor midday shooting. Neutral rendering in direct sunlight.
• Shade (≈7000K): warms up the cool blue cast of open shade.
• Cloudy (≈6000K): slight warming for overcast conditions.
• Tungsten (≈3200K): cools down the warm orange cast of incandescent lights.
• Fluorescent (≈4000K): attempts to counteract the green cast of fluorescent tubes.
• Flash (≈5400K): matches the slightly warm output of most speedlights.

Custom White Balance (Kelvin)

Setting a specific Kelvin value gives complete control. If you know the venue lighting is tungsten at approximately 3000K, set the camera to 3000K and the colours will be accurate. This produces the most consistent results across a session — every frame uses the same colour correction, making batch editing dramatically easier.

Custom White Balance (Grey Card)

Photograph a neutral grey card under the current lighting, then tell the camera to use that image as the white balance reference. This is the most accurate method — the camera measures the actual colour cast in the scene and compensates precisely. Professional photographers carry a grey card (like the X-Rite ColorChecker Passport) and take a reference shot at the start of each lighting setup.

White Balance in Wedding Photography

The Mixed-Lighting Challenge

Weddings are notorious for mixed lighting. A church may have tungsten chandeliers (warm), daylight streaming through stained glass (variable colours), and fluorescent strip lights in the vestry (green). A reception venue might combine candlelight (very warm), uplighting (coloured gels), and overhead LEDs (variable temperature). No single white balance setting can correct all these simultaneously.

The professional approach: shoot in RAW, set white balance to match the dominant light source (or use AWB as a starting point), and correct precisely in post-processing where RAW files allow unlimited white balance adjustment with zero quality loss.

Skin Tone Accuracy

Skin tone is the most critical white-balance target in wedding and portrait photography. Incorrect white balance produces:

• Too warm: skin appears orange, sunburnt, or jaundiced.
• Too cool: skin appears grey, ashen, or blue-tinged — unflattering and lifeless.
• Green cast: from fluorescent or LED lights — skin looks sickly.
• Magenta cast: from over-correcting green — skin looks flushed and ruddy.

Correct skin tones are warm and natural without being obviously orange. The white-balance sweet spot varies with skin tone — darker skin often needs slightly warmer white balance than lighter skin to avoid looking ashy.

Managing Candle-Lit Receptions

Candlelight is around 1800-2000K — extremely warm. Setting white balance to "tungsten" (3200K) or manually to 2500-3000K preserves *some* warmth while preventing faces from turning solid orange. The goal isn't to neutralise the warmth entirely — that would eliminate the romance of candlelight — but to keep skin tones recognisable while maintaining the amber atmosphere.

Flash White Balance

Camera flash is approximately daylight-balanced (5400-5600K). When firing flash in a tungsten-lit room, the flash illuminates the subject at 5500K (neutral) while the background remains lit by tungsten at 3000K (warm orange). This creates a split — neutral subject, warm background. To match, photographers add orange (CTO — Colour Temperature Orange) gel filters to the flash, shifting its output to match the ambient light. Then the camera's white balance can be set to tungsten, and everything matches.

Correcting White Balance in Post-Processing

RAW files contain all colour data captured by the sensor — white balance is applied as metadata, not baked in. This means white balance can be changed completely in post-processing with no quality loss:

• Temperature slider: moves between warm (right) and cool (left). This is the primary adjustment.
• Tint slider: moves between green (left) and magenta (right). This corrects the green/magenta axis that temperature doesn't address — essential for fluorescent and LED lighting.
• Eyedropper tool: click on something that should be neutral grey (a grey card, a white shirt, a stone surface) and the software sets white balance to make that area neutral. This is the fastest, most accurate method.
• Sync/copy settings: correct white balance on one image, then sync or copy the setting to all images taken in the same lighting. This is why consistent shooting (RAW, same lighting setup) makes editing dramatically faster.

Creative White Balance Choices

White balance isn't always about accuracy — it's also an artistic tool:

• Intentionally warm: setting white balance warmer than "correct" creates a golden, nostalgic feel. Popular for outdoor portraits, especially at golden hour.
• Intentionally cool: setting white balance cooler creates a moody, editorial feel. Popular for overcast days, winter weddings, and dramatic portraits.
• Preserving ambient character: in candle-lit rooms, preserving the amber warmth rather than neutralising it maintains the romantic atmosphere the couple created.