Appendix; Glossary - Sekonic SPECTROMASTER C-800 Operating Manual

9.

Appendix

9-1

Glossary

Term
Color temperature refers to the chromaticity of a heated object (commonly
refer to as a black body) that will vary according to its temperature. The color
temperature is measured in units of Kelvin (K) and refers to the temperature of
a heated object at a given color or chromaticity.
Color
The higher color temperature is, the bluer the light, and the larger the Kelvin
Temperature
value becomes. The lower the color temperature is, the redder the light, and
the smaller the Kelvin value becomes.
A figure that plots the changes of color temperatures on an xy chromaticity
diagram is called the black body radiation locus.
Not all light sources match the black body radiation locus when measuring light
Correlated sources.
Color In this case, the correlated color temperature is used. The correlated color
Temperature temperature is a color temperature obtained by drawing an isotemperature line
from the black body radiation locus which matches the measured value.
Photographic
Color temperature calculated by using the ratio of R, G and B characteristics
Color
obtained by measurement to match to the characteristic of film.
Temperature
Light This refers to the electromagnetic wavelength ranging from 380nm to 780nm
(Visible light) that can be detected by the human eye.
Theoretically, this is an object that absorbs all wavelengths and when heated,
Black Body
emits light equivalent to the applied color temperature.
This refers to the light emitted by a black body.
Black-body
The amount of energy released for each wavelength changes with the applied
Radiation
color temperature, resulting in visible color variations.
Expressed in absolute Kelvin temperature, with units of "K". 0 (zero) K is
K
equivalent to -273.15 °C or -459.67 °F.
The deviation between the correlated color temperature and the black body
radiation locus.
uv
When the correlated color temperature is above the black body radiation locus,
a "+" sign is assigned; when below, a "-" sign is assigned.
Description
185
9. Appendix