Nintendo Wii Programming Manuallines page 24

Wii Programming Guidelines
Screen Light Output in Nits versus Luminance Voltage
200
180
160
140
120
100
80
60
40
20
0
0 100
The relationship between voltage and luminance is determined by the following formula:
In this formula, L is luminance in nits or candelas per square meter and mV is luminance voltage in
millivolts.
3. Third, luma (Y), which the Wii console converts and outputs, can be calculated from the RGB values
(from 0 to 255 each) of the Wii software side, by using the following formula:
Y is a value between 16 and 235. When NTSC composite video or S terminal video outputs white
100%, the analog output voltage is 714 mV (except the synchronized level). These relationships
result in the following formula for converting RGB into screen luminance in nits on an NTSC
display:
RVL-06-0132-001-I
Released: October 11, 2006
200 300 400
Voltage (millivolts)
⎛
mV
=
⎜
L
⎝
714
= +
Y . 0 257 * R . 0 504
500 600
2 2 .
⎞
×
⎟
200
⎠
+ +
* G . 0 098 * B 16
24
Voltage
(mV)
0
25
50
75
100
125
150
175
200
225
250
275
300
325
350
375
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425
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475
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525
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625
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700 714
714
© 2006 Nintendo
CONFIDENTIAL
Light
2
(cd/m )
0.00
0.13
0.58
1.41
2.65
4.33
6.46
9.07
12.17
15.76
19.88
24.51
29.69
35.40
41.67
48.50
55.90
63.88
72.44
81.59
91.33
101.68
112.64
124.21
136.40
149.22
162.67
176.75
191.47
200.00