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Nikon Z 6 Owner's manual

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1/5 September 1st, 2018
©
2018 Nikon Corporation
N-Log
Speci cation Document
Version 1.0.0
En
SB8I01(11)
6MOA2111-01
2/5
N-Log Speci cation Document
September 1st, 2018
Version History
Version Date
1.0.0 September 1st, 2018
Contents
1. Introduction .............................................................................3
2. Curve Characteristics .............................................................4
3. Gamut and White Point .........................................................5
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N-Log Speci cation Document
September 1st, 2018
1. Introduction
This document describes N-Log curve and colorimetric information. N-Log is designed
to permit full use of sensor dynamic range in a professional movie work ow. The curve
characteristics of N-Log balance shadows and highlights and are optimized for 10-bit
movie recording.
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N-Log Speci cation Document
September 1st, 2018
2. Curve Characteristics
The following  gure shows N-Log curve characteristics.
0
Stops
12345678-1-2-3-4-5-6-7-8
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 re ectance 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 re ectance. (“y = 0.18” is equivalent to Stop 0.)
The function from re ectance to N-Log is as follows.
if (y < 0.328)
x = 650 * (y + 0.0075)^(1/3)
else
x = 150*log(y)+619
end
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N-Log Speci cation Document
September 1st, 2018
3. Gamut and White Point
The table below shows the gamut and white point for N-Log.
CIE xy chromaticity
xy
White point 0.3127 0.3290
Red primary 0.708 0.292
Green primary 0.170 0.797
Blue primary 0.131 0.046
The white point of N-Log is D65.
The gamut for N-Log is same as the wide color gamut known as “ITU-R BT.2020”.
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