Tutorials Cinematography & Color Science

Log Profiles vs. HDR Video: S-Log, C-Log, V-Log & HDR Standards

By Infinite Creation · Intermediate · ~9 min

A 1960s mid-century comic book style editorial illustration showing a cinematographer comparing flat Log gamma curves on waveform monitors against high peak luminance HDR display monitors.

Overview

One of the most frequent misconceptions in video production is confusing Log camera profiles (Sony S-Log3, Canon C-Log3, Panasonic V-Log, Nikon N-Log) with High Dynamic Range (HDR) display formats (HLG, PQ, HDR10, Dolby Vision). While both deal with dynamic range, Log is an intermediate camera capture curve, whereas HDR refers to display-referred delivery standards. This guide breaks down the color science differences and post-production workflows for both systems.

Log Profiles (Camera Acquisition Curve)

A Logarithmic (Log) curve is a mathematical gamma transfer function applied during camera recording to compress the high dynamic range of a digital camera sensor into a 10-bit or 12-bit video container file:

Flat & Desaturated Appearance: Un-graded Log footage looks low-contrast and washed out because light levels are distributed logarithmically across the bit-depth scale.
Sensor Range Preservation: Protects specular highlights from clipping and shadow details from crushing before post-production color grading.
Intermediate Format: Log footage is never intended for direct viewing by end audiences. It must be mapped via LUTs or Color Space Transforms (CST) into a final target display format (Rec.709 SDR or Rec.2020 HDR).

S-Log3

Sony S-Log3 / S-Gamut3.Cine

Optimized for Sony Cinema Line sensors. Distributes shadow, midtone, and highlight stops almost linearly on a logarithmic scale similar to film negative scans.

C-Log3

Canon C-Log3 / Cinema Gamut

Provides a wider dynamic range curve with clean noise handling in midtones and straightforward conversion to Rec.709 monitors.

V-Log

Panasonic V-Log / V-Gamut

Delivers 14+ stops of dynamic range matching the Varicam and Lumix full-frame sensor response, utilizing Cineon log curve characteristics.

HDR Video (Display-Referred Delivery Standards)

High Dynamic Range (HDR) defines how video brightness and color are rendered on modern consumer displays (OLED, Mini-LED, TVs, smartphones) capable of peak luminance levels from 1,000 to 10,000 nits:

HDR Standard	Transfer Function	Peak Luminance & Metadata
HLG (Hybrid Log-Gamma)	ITU-R BT.2100 HLG	Backwards-compatible with SDR monitors. No dynamic metadata required. Peak ~1,000 nits.
HDR10	SMPTE ST 2084 (PQ)	Absolute luminance curve (up to 1,000 nits). Uses static MaxFALL / MaxCLL metadata.
Dolby Vision	SMPTE ST 2084 (PQ)	Dynamic frame-by-frame metadata (up to 4,000+ nits) for display-specific tone mapping.

Comparison Summary: Log vs. HDR

Feature	Log Profiles (S-Log, C-Log, V-Log)	HDR Video (HLG, PQ, Dolby Vision)
Role in Pipeline	Production / Acquisition (In-Camera Capture)	Post-Production / Final Output Delivery
Visual Appearance	Flat, desaturated, grey contrast	High contrast, vibrant color, extreme highlights
Target Device	NLE Color Grading Timeline	Consumer HDR TV, OLED Screen, Smartphone

Where This Fits

Log and HDR are often confused at the grading stage, and Color Grading in DaVinci Resolve covers the grade that sits between them.

Choosing between them

Log and HDR answer different questions and are frequently confused because both involve wide brightness ranges. Log is a recording choice, preserving detail for grading later. HDR is a delivery choice, showing a wider range of brightness on a display capable of it. Shooting log does not produce HDR, and HDR delivery does not require log.

Log footage is not meant to be watched. It looks flat and grey because the curve is spending its range on capturing detail rather than on looking correct, and a conversion to display colour is a required step rather than a stylistic one.

Deliver HDR only when you can check it. An HDR grade judged on a display that cannot show its range is guesswork, and the result frequently looks wrong on the devices that can. Where you cannot monitor properly, a well-made standard delivery beats a poorly monitored HDR one.

Vocabulary

Log curve. A recording curve distributing a sensor's range so that highlight and shadow detail survive. Produces a flat image intended for conversion, not for viewing directly.

Transfer function. The relationship between the light a camera received and the values stored in the file, or between stored values and the light a display emits. Different standards define different ones, which is why footage needs converting between them.

Nit. A unit of display brightness. Standard displays target around a hundred, and HDR displays reach several times that, which is the range an HDR grade is made for and a standard display cannot show.

Tone mapping. Compressing a wide brightness range into a narrower one for display. Necessary whenever content is shown on a device with less range than it was graded for, and done badly it flattens or clips the result.