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Correlated colour temperature - uncertainty and estimation

J L Gardner

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Correlated colour temperature (CCT) of a source is estimated from position in CIE 1960 (u, v) colour space in relation to the black-body locus. In this paper, the methods of the ISO Guide to the Expression of Uncertainty in Measurement are applied to derive analytical expressions for uncertainty in u and v chromacity coordinates and CCT, including correlation effects. Uncertainty in CCT is found by fitting the form of the black-body locus and relevant derivatives. Examples are given for calibration of four typical sources of spectral distributions. Accurate CCT is determined by a search technique. An alternative method using fitted functions to solve for CCT using the geometry in (u, v) space is presented. An uncertainty in CCT of a few kelvin can be achieved.


PACS

06.20.Dk Measurement and error theory

07.60.Dq Photometers, radiometers, and colorimeters

06.20.F- Units and standards

Subjects

Instrumentation and measurement

Dates

Issue 5 (October 2000)



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