Nikon COOLPIX P900 N-Log Specification Document - Page 4
Curve Characteristics
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10-bit code value N-Log Specification Document 2. Curve Characteristics The following figure shows N-Log curve characteristics. 1024 896 768 640 512 384 256 128 0 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 Stops The function from N-Log to reflectance is as follows. if (x < 452) y = (x/650)^3 −0.0075 else y = exp[(x−619)/150] end x is the N-Log 10-bit code value. y is reflectance. ("y = 0.18" is equivalent to Stop 0.) The function from reflectance to N-Log is as follows. if (y < 0.328) x = 650 * (y + 0.0075)^(1/3) else x = 150*log(y)+619 end 4/5 September 1st, 2018
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N-Log Specification Document
September 1st, 2018
2. Curve Characteristics
The following figure shows N-Log curve characteristics.
0
Stops
1
2
3
4
5
6
7
8
-1
-2
-3
-4
-5
-6
-7
-8
10-bit code value
0
128
256
384
512
640
768
896
1024
0
128
256
384
512
640
768
896
1024
The function from N-Log to reflectance is as follows.
if (x < 452)
y = (x/650)^3 −0.0075
else
y = exp[(x−619)/150]
end
x is the N-Log 10-bit code value.
y is reflectance. (“y = 0.18” is equivalent to Stop 0.)
The function from reflectance to N-Log is as follows.
if (y < 0.328)
x = 650 * (y + 0.0075)^(1/3)
else
x = 150*log(y)+619
end