What are White-Balance and Color-Temperature?
Color-temperature is a way to describe the color of light along a spectrum that goes from warm colors (measured as having a lower temperature) to cool colors (measures as having a higher temperature). Color-temperature is measured in Kelvin degrees and corresponds to the temperature at which a certain metal must be heated to emit light of that color. That is why lower temperatures (say 3000K) give off warm (yellow-orange) light and that high temperatures (9000K) give off color (bluish) light. White-balance is the process of canceling the effect color-temperature in a photograph. This is because our brain corrects what our eyes see to let us see white as white, although it may be tinted by the color-temperature of light. If the color-temperature of light is known, then its effect can be mostly canceled. Automatic white-balance guesses at that temperature (see this question). Preset white-balance use mostly fixed known temperatures (6500K for daylight, 9500k for cloudy, 3000k for tungste
