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Looking at the world through your naked eye you'd probably never notice it, but light varies in color depending on the light source, the time of day, the weather and a lot of other factors. The human eye automatically compensates for these variations in color and our eyes adjust to always see light as a neutral white. Unfortunately, camera sensors are not as advanced as the human visual system, so your digital camera may produce images with a color cast. There are many sources of light and each source has its own color temperature measured in degrees Kelvin designated by K.
Just in case you're ever asked this question on a quiz show, the Kelvin scale is named after a British scientist, Lord Kelvin, the father of thermodynamics. He discovered that different light sources emit different colors, and he assigned a temperature measured in degrees Kelvin. For instance, color temperatures over 5000 K are called cool colors, and they're kind of a bluish-white. While lower color temperatures, 2700 to 3000 K, are called warm colors, and they're yellowish white through red.
This color temperature explains why photos taken inside your home may have a golden cast. And images taken at a office using traditional fluorescent lightning have a greenish cast. And pictures taken outside in the shade might look a little bit blue. And mixable light sources can result in a funny looking photograph. Unless that's your creative intent. Fortunately digital cameras have a white balance setting, this control is used to compensate for any difference in color temperature. And allows the cameras sensor to record the images as you see them with your eyes.
Some color casts can be beautiful and evoke a mood such as the warm glow of a sun set, or they can negatively effect the aesthetic quality of your image. Such as a pink or green glow from indoor sporting events. It all depends upon your creative vision.
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