# reciprocal color temperature

[4.6.4.3] Color temperature Tc expressed on a reciprocal scale (1/Tc). An important use stems from the fact that a given small increment in reciprocal color temperature is approximately equally perceptible regardless of color temperature. Also, color temperature conversion filters for sources approximating graybody sources change the reciprocal color temperature by nearly the same amount anywhere on the color temperature scale.

Note: The unit is the reciprocal megakelvin (MK-1). The reciprocal color temperature expressed in this unit has the numerical value of 106/Tc when Tc is expressed in kelvins (K). The acronym MIREK (for micro-reciprocal-kelvin) occasionally has been used in the literature. The acronym MIRED (for micro-reciprocal-degree) is now considered obsolete as the name for this unit.

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