The Kelvin scale measures the color temperature of light, with lower numbers looking warm and orange and higher numbers looking cool and blue. Setting a custom white balance tells your camera what neutral looks like under your current light, so whites stay white and skin tones look natural.
How the Kelvin Scale Works
Color temperature is written in kelvin (K). Candle flame and many warm household bulbs sit low on the scale, while midday daylight sits in the middle and open shade or overcast sky sits higher. The numbers below are general ranges and real light varies.
| Light source | Rough range | Look |
|---|---|---|
| Candle or warm bulb | 1800 to 3000 K | Orange |
| Sunrise or sunset | 2500 to 3500 K | Warm gold |
| Midday sun | 5000 to 5600 K | Neutral |
| Overcast sky | 6000 to 7000 K | Slightly cool |
| Open shade | 7000 to 8000 K | Blue |
When you set a Kelvin value on your camera, you tell it the color of the light so it can correct for it. Setting 3200 K, for example, cools the image to cancel a warm bulb.
Why Presets Sometimes Fall Short
Auto white balance and the daylight, shade and tungsten presets are good first choices. They struggle with mixed light, colored walls, LED panels and scenes dominated by one color, because the camera guesses at what should be neutral.
How to Set a Custom White Balance
- Place a neutral gray card or a white balance target in the same light as your subject.
- Fill the frame with the card and make a normal exposure. Focus is not critical.
- Open the camera menu and find the custom or preset white balance option.
- Choose the photo you just took as the reference image.
- Switch white balance to the custom slot and shoot a test frame.
- Repeat the process whenever the light changes, for example when clouds move in or you walk to a different room.
Menu names differ between makers, so check your manual for the exact path. If you have no card, a plain white sheet of paper can work, though it may carry a slight tint.
Shoot Raw to Keep Options Open
If you shoot raw files, white balance is stored as a setting and not baked in, so you can change the Kelvin value later without losing quality. A gray card photo at the beginning of a session still helps, because you can click it in your editor and copy that correction to every frame from the same light.
FAQ
What Kelvin value should I use outdoors?
A value in the neighborhood of 5200 to 5600 K is a common choice for direct sun. Treat it as a rough guide and adjust by eye.
Can I make a scene warmer on purpose?
Yes. Set a higher Kelvin number than the light really is, and the camera will add warmth. Many photographers do this to keep a golden evening look.
The Short Version
Low kelvin numbers are warm light and high numbers are cool light. Use presets for quick work, set a custom white balance from a gray card when light is tricky, and shoot raw so you can fine tune later.
