For this reason, a black body is an idealized object, used to generate standard values by matching specific colors of radiated light to specific temperatures. While any object will radiate various light frequencies when heated to high temperature, the temperature at which the light becomes a certain color differs from object to object. This is how color temperature is defined. Third, assume that the temperature of the black body when it radiates a certain color of light is also understood to describe that color. Second, assume that this black body radiates light when heated and that the wavelength and spectrum of this light varies with the temperature of the black body. This object (an idealized object, not one encountered in reality) is a black body, or perfect radiator. First, assume a subject that can completely absorb heat and light, then radiate this energy back out. Here we'll touch briefly on the technical definition of color temperature.
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Note that this diagram is merely a rough representation of how to think about color temperatures, not a precise indication of color temperatures under specific conditions.Ĭolor is expressed as a temperature due to the relationship between the color of light and temperatures when objects are heated to high temperatures. As color temperature increases, white gradually turns to blue. As color temperature decreases, white becomes yellow, then red. Since daylight has a color temperature of 5000-5500 K, setting the white balance to this figure makes it possible to capture photos with color reproduction close to that perceived by the eye.Ī diagram of color temperature. Most photographers shooting pictures with digital SLR cameras might set their white balance to 5000-5500 K. As you can probably guess, lower color temperatures mean redder light, while higher temperatures mean bluer light. The tables below indicate rough color temperatures for various lighting sources, including sunlight. While Kelvin is less familiar that Celsius, it should present no problems if we keep the following two basic points in mind: the lower the Kelvin value for color temperature, the redder a white object appears the higher the color temperature, the bluer it appears. Color temperature is specified in units of Kelvin (K) of absolute temperature, not the degrees Celsius (C) used to express the temperature of air and other materials. Color temperature refers to the color of light, serving as the standard index for color balance for a range of products, including monitors, cameras, and lighting equipment. We'll start with a brief explanation of the meaning of color temperature.
Since color temperature settings affect color reproduction significantly on an LCD monitor, if a user wants to display an image with the appropriate color cast, he or she must choose the correct color temperature. Most of today's LCD monitors feature color-temperature adjustment options in their OSD menus.
Why is temperature used to describe color? Note: Below is the translation from the Japanese of the ITmedia article "Altering a color dramatically with a single setting: Examining color temperature on an LCD monitor" published March 30, 2009. A good understanding of the meaning of color temperature will enable better adjustments of LCD monitor picture quality. While color temperature dramatically affects the picture quality of an LCD monitor, more often than not, people simply use the default settings. In this article, we'll focus on color temperature, a fundamental parameter in picture quality adjustments.
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