Topcon BM-7A - Page 92

Appendix
90
CIE 1976 L
*
u
*
v
*
color coordinate system
u' , v' : u'v' color coordinates
u
n
', v
n
' : u' and v' values according to standard light on perfect reflecting diffuser.
Color Difference
CIE 1976 L
*
a
*
b
*
color difference
⊿L
*
, ⊿a
*
, ⊿b
*
: Difference in lightness indexes Ｌ
*
, and chromatic indexes a
*
, b
*
between two
non-luminous object color.
CIE 1976 L
*
u
*
v
*
color difference
⊿L
*
, ⊿u
*
, ⊿v
*
: Difference between the lightness indexes Ｌ
*
, and chromatic indexes u
*
, v
*
between two non-luminous object color.
Color Temperature, Deviation
Color temperature and Deviation are calculated according to JIS Z 8725 "Method for determining
distribution temperature and color temperature or correlated color temperature of light source".
Color temperature display range 1563K ≦ Tc ≦ 100000K
Deviation display range -0.0２ ≦ duv ≦ 0.0２
Deviation is the distance from the blackbody locus on the CIE 1960 UCS color diagram.
116
16
Yn
Y
7.787 +
⎟
⎠
⎞
⎜
⎝
⎛
116
16
Zn
Z
7.787 +
⎟
⎠
⎞
⎜
⎝
⎛
116
16
Xn
X
7.787 +
⎟
⎠
⎞
⎜
⎝
⎛
()()( )
2
1
2
*
⊿b
2
*
⊿a
2
*
⊿L
ab
*
⊿E
⎭
⎬
⎫
⎩
⎨
⎧
++=
()()()
2
1
2
*
⊿v
2
*
⊿u
2
*
⊿L
uv
*
⊿E
⎭
⎬
⎫
⎩
⎨
⎧
++=
)'
n
u(u'
*
13L
*
u −=
)'
n
v(v'
*
13L
*
v −=