Video Log and Gamma: What Log Does and When to Use It

What is log recording

Log, short for logarithmic, is a gamma curve applied to video to encode a wider range of brightness values into the same bit depth. Instead of spreading the available digital values evenly across the tonal range the way a standard Rec.709 gamma does, a log curve assigns more values to the midtones and fewer to the highlights and shadows. The result is a flat-looking image that appears low in contrast and desaturated, but contains more usable highlight and shadow detail.

Camera makers implement log under different names, such as S-Log, C-Log, N-Log, or V-Log. Most interchangeable-lens cameras with advanced video features offer at least one log profile, and some compact and cinema cameras do as well. When you select a log profile, the camera records video with that gamma curve instead of the standard one, and you apply a conversion later to view or edit it normally. The core idea is the same across brands: preserve more of the sensor's dynamic range in the file so you can make creative decisions in post.

For a full explanation of how sensors capture brightness and why gamma matters, see the related article on dynamic range.

• Log stores more highlight and shadow detail than standard gamma
• Log footage looks flat and low in contrast until graded
• Each brand has its own log curve names, but the principle is universal

Why shoot log: dynamic range preservation

The main reason to shoot log is to keep the dynamic range the sensor captured. A standard picture profile applies strong contrast and saturation in camera, which pushes some highlight values to pure white and some shadow values to pure black. Once those values are clipped, they cannot be recovered in editing. A log profile compresses the tonal range so the file retains more gradual steps between the brightest and darkest parts of the scene.

Canon's technology pages describe how the company combines optical and image-processing technologies to capture and render images true to their intended purpose. The image processing chain in a camera decides how the sensor's raw data becomes a video file, and the gamma curve is a central part of that decision. Log is one of the tools that lets you push the processing toward maximum flexibility instead of a finished look.

Shooting log is common for interviews, narrative work, and any scene with a wide range of brightness, such as a person standing in front of a bright window. It gives the colorist room to balance the exposure of the subject and the background in post, similar to the latitude you get when shooting raw stills. For a deeper comparison, see the exposure triangle explained and the bit depth and color articles.

When not to use log

Log is not always the best choice. Because log footage is designed to be graded, it looks flat and lifeless if you do not plan to color it. If your workflow is to deliver video straight from the camera, a standard picture profile will give you a more usable image. For event coverage, documentary work with fast turnaround, or any situation where you do not have time for a grading pass, a standard profile is often the practical choice.

Log also has a few technical trade-offs. The flat curve places more of the bit depth in the midtones, which means that if you are shooting an 8-bit file, you have less precision in the highlights and shadows where banding and noise can appear when you push the image in post. Higher bit depths, such as 10-bit recording, handle log much more gracefully. The video bitrate and quality article explains how bit depth and bitrate affect file quality. If your camera records only 8-bit video, consider whether the log profile is worth using or whether a standard profile with in-camera contrast control will give you cleaner results.

In low light, log can also make noise more visible when you lift shadows in the grade. A standard profile applies some noise reduction and contrast in camera that can mask noise in shadow areas. If your scene does not have extreme brightness range, and you are shooting in dim conditions, the benefits of log are smaller.

Color grading basics for log footage

To view log footage normally, you apply a conversion, either a look-up table (LUT) or a color space transform inside your editing software. A LUT is a preset mathematical transformation that maps the log-encoded values to a standard display color space. Camera makers often provide free LUTs for their log profiles, and editing programs include them as well. Once the conversion is applied, you can then make adjustments to exposure, contrast, white balance, and color.

Nikon's education section includes a step-by-step guide to using LUTs on its ZR cinema camera, showing that the workflow is an expected part of professional production. The same principle applies on cameras that shoot log: the LUT is a starting point, not a final grade. After the conversion, you shape the look with color wheels, curves, and other grading tools.

A common beginner workflow is to expose Log footage based on the camera's recommended exposure index, which is often higher than the base ISO. This places the midtones correctly for the log curve. Without proper exposure, log footage can easily be underexposed in the shadows, which produces noise when lifted, or overexposed in the highlights, which defeats the reason for shooting log.

The histogram and zebra guide can help you judge exposure when shooting log, since a flat image does not look correct on a normal monitor. Also review the white balance explained article to keep color accurate in your log workflow.

What to look for in a camera

If you plan to shoot log, some camera features matter more than others. A 10-bit recording mode is the most important, because it gives the grade enough tonal precision to avoid banding in skies and gradients. Cameras that output log over HDMI to an external recorder can also achieve 10-bit even if they do not record 10-bit internally, but that adds cost and complexity.

Check whether the camera provides a log view assist or monitoring LUT. This is an in-camera preview that shows a graded version of the log image on the screen, so you can judge exposure and composition while recording. Without it, you are judging focus and exposure from a flat image, which takes practice.

Some cameras offer a choice between several log profiles, while others offer a single one. A brand's implementation can change how the camera meters and what ISO settings it recommends. Read the camera's manual or the maker's support page for guidance on exposing that specific log curve.

For a camera that fits how you intend to work, browse the best video cameras guide or the best 4K cameras guide. If you want higher resolution, check the best 5K or 6K cameras guide. When you are deciding between a compact camera and an interchangeable-lens model, the best 1-inch cameras article offers useful comparisons.

What to pick for your use

Questions

Is log recording the same as shooting raw video?

No. Raw video records unprocessed sensor data, while log is a gamma curve applied to a processed video file. Log preserves more dynamic range than standard gamma, but raw preserves even more and offers greater flexibility. Raw files are much larger and require more processing power.

Does shooting log lower the resolution or sharpness?

No. Log affects the tonal curve, not the pixel count or the optical resolution. The image can look softer because of the reduced contrast, but the underlying detail is the same. Sharpening is usually applied in post after the log conversion.

Do I need a LUT to edit log footage?

Practically yes. A LUT is the simplest way to convert log footage to a standard color space for editing and viewing. Without one, the image looks flat and it is hard to judge the color and exposure. Most editing programs include LUTs for common log formats, and camera makers supply them as free downloads.

Is log only for professional filmmakers?

Not at all. Any camera with a log profile can benefit from it if you are willing to learn basic color grading. The learning curve is mostly about exposure and a simple LUT apply. Once you understand the workflow, log gives you a lot of control even on consumer cameras.

Why does my log footage look gray and washed out?

That is exactly how log is supposed to look. The flat gamma curve compresses the contrast to preserve dynamic range. When you apply a LUT or grade the footage, the contrast and saturation return. The gray look is a sign that your camera is correctly recording log.

Can I shoot log in low light?

You can, but with caution. Log shifts more bits to the midtones, so shadows may have more noise, especially in 8-bit recording. If your scene has low contrast and is dark, a standard profile might be cleaner. If the scene includes bright sources, log can still help protect them from clipping.