Konica Minolta Chroma Meter CS-200 - Manual (Page 105)

103
De
scr
ipti
on
L
v
T∆uv
Following factors can be acquired as measurement value with LvT(d)uv as color space of
this instrument.
L
v
: Luminance
T : Correlated color temperature
∆uv : Color difference from blackbody locus
While L
v
stands for luminance, T and ∆uv for color in L
v
T∆uv.
<Relation between correlated color temperature T and color difference from
blackbody locus ∆uv>
Color temperature refers to the temperature of black body (perfect radiator) which has
equal chromaticity coordinates to certain light. However, color temperature only repre-
sents colors on blackbody locus.
Correlated color temperature, slightly wider interpretation of color temperature, is very
useful to eliminate such problem. Here, correlated color temperature covers those which
are slightly outside the range of that of blackbody locus.
If a certain color positions on isotemperature line, the intersection point of isotempera-
ture line and blackbody locus is indicated as correlated color temperature for the color.
Isotemperature line means line on chromaticity coordinates which is a set of colors visu-
ally close to color temperature on blackbody locus.
However, since all colors on a color-matching temperature line are represented with
equal correlated color temperature, it is not possible to describe color only with corre-
lated color temperature. To solve that, ∆uv, deviation of correlated color temperature T
from blackbody locus, is to apply for that purpose. If ∆uv exists above blackbody locus,
it is represented with "+", and below, with "-".
v
u
Blackbody locus
Correlated temperature T
∆uv
0.35
0.30
0.20 0.25 0.30
∆