White Point
The chromaticity coordinates defining 'white' in a color space. It corresponds to a light source's color temperature and serves as the reference for white balance and color management.
A white point is the chromaticity coordinate that defines "perfect white" within a given color space or device. Physically, it corresponds to the color of a specific illuminant at a particular color temperature. All other colors in the space are defined relative to this reference white.
The most widely adopted white point is CIE Standard Illuminant D65, approximating daylight at approximately 6504K. sRGB, Adobe RGB, and Display P3 all specify D65. The printing industry uses D50 (approximately 5003K), and the ICC Profile Connection Space also uses D50.
- Chromatic adaptation transforms: Converting between spaces with different white points requires models such as Bradford or Von Kries. The D65-to-D50 conversion is common in ICC color management
- White balance: A camera's white balance adjusts the image's white point to match the scene illuminant. In RAW processing, the white point can be freely modified after capture
- Monitor calibration: Displays are typically calibrated to D65 (6500K). Print proofing environments may target D50 (5000K) per ISO 3664 viewing conditions
A shifted white point manifests as a global color cast. Higher color temperatures (bluer) produce a cool appearance, while lower temperatures (yellower) create warmth. The color temperature slider in photo editors is essentially a white point adjustment, shifting the neutral axis along the blue-yellow dimension.