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sRGB
V
s
R
G
B
′
=
{
12.92
L
;
0
≤
L
≤
0.0031308
1.055
L
(
1
2.4
)
−
0.055
;
0.0031308
<
L
≤
1
{\displaystyle V'_{sRGB}={\begin{cases}\ {12.92L};&0\leq L\leq 0.0031308\\\\{1.055L}^{\left({\frac {1}{2.4}}\right)}-0.055;&0.0031308<L\leq 1\\\end{cases}}}
Rec. 709
L
=
{
E
709
′
4.5
E
709
′
⩽
0.081
E
709
′
+
0.099
1.099
(
1
0.45
)
,
0.081
⩽
E
709
′
{\displaystyle L={\begin{cases}{\dfrac {E'_{709}}{4.5}}&E'_{709}\leqslant 0.081\\\\{\dfrac {E'_{709}+0.099}{1.099}}^{\left({\frac {1}{0.45}}\right)}&,0.081\leqslant E'_{709}\\\end{cases}}}
Other
L
u
m
i
n
a
n
c
e
=
0.2126
R
+
0.7152
G
+
0.0722
B
{\displaystyle Luminance=0.2126R+0.7152G+0.0722B\,\!}
L
=
M
a
x
+
M
i
n
2
{\displaystyle L={\frac {Max+Min}{2}}\,\!}
V
=
M
a
x
{\displaystyle V=Max\,\!}
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