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N-Log
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N-Log

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Nikon's logarithmic gamma curve for video recording that preserves sensor dynamic range for color grading.

Overview

N-Log is Nikon's logarithmic gamma curve (log profile) for video recording. The name is a combination of "N" (Nikon) and "Log" (logarithmic function). Instead of recording a high-contrast, finished-looking image, N-Log distributes tonal values logarithmically, thus preserving detail in highlights and shadows – the footage is flat and desaturated, and is only brought to the target color space in post-production color grading.

N-Log is not lighting or grip equipment, but an in-camera recording technique. It is Nikon's counterpart to log profiles from other manufacturers such as S-Log (Sony), Log-C (ARRI), or V-Log (Panasonic) and was introduced with the Z-series mirrorless cameras.

Technical Specifications

According to Nikon's official "N-Log Specification Document" (Version 1.0.0, September 1, 2018), the following applies:

  • Optimization: The curve is designed for 10-bit recording.
  • Reference Point: 18% reflectance (middle gray) corresponds to "Stop 0".
  • Color Space (Gamut): identical to the wide-gamut color space ITU-R BT.2020.
  • White Point: D65 (CIE xy = 0.3127 / 0.3290).
  • Dynamic Range: Nikon states an achievable dynamic range of up to 12 stops for N-Log footage.
Primary Color / White PointCIE xCIE y
White Point (D65)0.31270.3290
Red0.7080.292
Green0.1700.797
Blue0.1310.046

The transfer function from N-Log to reflectance is defined in the spec document (x = 10-bit codepoint, y = reflectance): for x < 452, y = (x/650)³ − 0.0075 applies, otherwise y = exp[(x − 619)/150].

On-Set Usage

N-Log is selected as the tonal mode in the camera and, depending on the model, can be recorded internally (e.g., in H.265 10-bit, ProRes 422 HQ 10-bit, or as N-RAW/ProRes RAW) or, with older Z cameras (Z 6, Z 7), exclusively via the HDMI output to an external 10-bit recorder like the Atomos Ninja. Since N-Log delivers a flat, desaturated image, the cameras display a View Assist function that presents the monitor image with more contrast, without altering the recording.

For post-production, Nikon provides a 3D LUT that converts N-Log to the Rec. 709 color space; it serves as a starting point for grading. Practical consideration for lighting: Due to the shifted base sensitivity and the wide dynamic range, N-Log is usually slightly overexposed on set ("exposed to the right") and lit cleanly to avoid noise in the shadows.

From the crafts

Perspectives

Cinematographer

Ich nutze N-Log hauptsächlich bei schwierigen Lichtsituationen, wo ich später in der Farbkorrektur noch 2-3 Stops rausholen muss. Das flache Bild aus der Kamera sieht beschissen aus, aber ich kann damit Fensterdetails und Gesichter gleichzeitig retten. Bei Standard-Beleuchtung spare ich mir den Aufwand und bleibe bei Nikon Flat.

Director

N-Log gibt mir die Sicherheit, dass schwierige Locations wie Fabrikhallen oder Bars mit Neonlicht später noch rettbar sind, ohne dass ich stundenlang ausleuchten muss. Der erweiterte Dynamikumfang hilft mir, natürliche Lichtstimmungen zu erhalten, die zur Geschichte passen. Allerdings brauche ich immer einen versierten Coloristen, weil das rohe Material völlig leblos wirkt.

Producer

N-Log bedeutet 30-40% größere Speicheranforderungen und mindestens einen zusätzlichen Tag für Farbkorrektur im Budget. Dafür spare ich oft Beleuchtungszeit am Set, besonders bei Documentary-Style-Produktionen oder tight gedrehten Szenen. Die Nikon-Kameras sind günstiger als RED oder ARRI, aber die Post-Kosten gleichen das teilweise wieder aus.

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