A way to describe the color of light, measured in kelvin (K). Lower values are warmer (more orange). Higher values are cooler (more blue). Tungsten bulbs are about 3200K. Midday daylight is about 5500K. Shade and overcast skies are cooler. Sunlight is warmer near sunrise and sunset.
Our eyes adapt, so colors usually look normal to us. A camera needs the right white balance setting to do the same. If the setting does not match the light, the photo gets a color cast, for example orange or blue.
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