186
9. Appendix
Term Description
MK
-1
Read as "per mega Kelvin", this unit is based on the International System of
Units and is equivalent to the traditional unit of MIRED (mrd). It expresses
the inverse of the color temperature. The inverse of the color temperature is
1,000,000 divided by the color temperature.
Inverse color temperature = 1,000,000/Color temperature
The inverse color temperature decreases as the color temperature increases.
Ex.) 10,000K=100MK
-1
, 3200K=312.5MK
-1
If a 100K change is applied to both 10,000K and to 3,200K, the human eye
perceives the change applied to 3,200K as larger. In other words, there is a
difference in perception of the same change in color temperature depending on
the color temperature's numerical value.
When the inverse color temperature is used, the human eye perceives a given
amount of change as the same for any color temperature.
daMK
-1
MK
-1
divided by 10. Because the unit MK
-1
is extremely small compared to
the amount of change in color temperature the human eye can perceive, and
because performing corrections is difcult, for practical purposes the unit
daMK
-1
(deca per Mega Kelvin) is used. This unit is also used in conventional
lters that change color temperature.
LB Index
The difference of the reciprocal of the selected color temperature and the
reciprocal of the measured color temperature. It is expressed in units of MK
-1
(equivalent to MIRED) or daMK
-1
.
LB Filter
Stands for "Light Balancing Filter", and refers to a lter used for correcting color
temperature in photography. A blue lter is used to raise the light source color
temperature, while an amber lter is used to lower it.
By using the custom settings in the C-800, the display can be changed to show
the type of the lter brand being used.
CC Index
Number that expresses the amount of difference between the G component
(Green range) of the measured light source and the base black body radiation
of the color temperature. 1CC index is equivalent to 2.5CC lter number.
CC Filter
Number
Stands for "Color Compensating Filter", and refers to a lter used for correcting
color in lighting.
There are 6 different types of lters Yellow (Y), Magenta (M), Cyan (C), Blue (B),
Green (G), and Red (R), but the C-800 uses the Magenta (M) and Green (G)
types.
CRI
The Colour Rendering Index (CRI), dened by CIE (International Commission
on Illumination) Publication 13.3, is widely used for assessing the colour
rendering characteristics
(the color appearance of objects) of light sources.
The CRI values are based on the color appearance of objects compared to
their appearance under the dened reference illuminant.
In the CRI, there are special color rendering indices (R1 to R14, and R15) and
the general color rendering index (Ra) which is the avaraged value from R1 to
R8.
It was rst published in 1965 after uorescent lamps had emerged, and was
last improved in 1974.
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