A quality of colour used by photographers to determine the correct kind of film and the appropriate filter to be used in relation to a particular light source. Colour temperature is measured in Kelvin Units (K's) or mireds by using a colour temperature meter. A particular temperature reading indicates the light source rather than its temperature and tells us that the light source emits a light resembling that which would be given out by a body having a temperature equal to the reading. Colour temperature increases the higher the blue wavelengths. A blue sky can produce a measurement 16,000 K and sunrise a measurement of between 2,000 and 3,000 K. Colours can be described as warm colours or cold colours.
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