Why does log footage look washed out?

An unprocessed log image looks flat because it has not yet received a display transform or color grade. ARRI describes this in its Color FAQ, comparing Log C footage to a camera negative: an intermediate image prepared for finishing rather than direct viewing.

A monitoring LUT or a Rec.709 preview changes what you see while you shoot and leaves the log signal in the clip for grading. Baking a LUT is the other option: the app writes the converted picture into the clip itself, and that change is permanent.

A sensor sees a far wider range of brightness than an ordinary video file can hold. A picture profile decides how the camera fits that range into the file. A standard profile makes the decision at the moment of the recording. It applies a contrast curve that looks correct immediately. The parts that do not fit, such as a blown-out sky or the black under a chair, are lost permanently.

A log profile uses a different tone curve. The Final Cut Camera User Guide says: “Log footage is captured using a logarithmic curve to preserve a greater dynamic range than standard video, resulting in a flat, desaturated image intended for color grading.”

Panasonic's page on how V-Log and V-Gamut work gives the clearest account of why the picture on your screen looks wrong: “To store this wide range of exposure in the recorded image, a log (logarithmic) contrast curve is utilized. However, displaying this huge range of image contrast (the darkest shadows to the brightest highlights) in Log format on a conventional monitor will result in an image that looks flat and dull to the eye, with colors appearing desaturated. These Log-recorded images are used to provide the greatest possible flexibility for later color correction; they are not intended to be viewed directly.”

Apple's Motion User Guide glossary describes the full sequence, from the flat recording to the finished picture: “A method of encoding video that preserves shadow and highlight details. A log recording takes the dynamic range (exposure range) of the source image and maps it across a logarithmic curve. This allows you to flexibly manipulate the shadows and highlights in post-production. Initially, a log recording looks flat, desaturated, and lacking in contrast. But when you apply a camera LUT or make manual color corrections, the video reflects the natural vibrancy and contrast of the original scene.”

Panasonic publishes exact 10-bit code values for V-Log in its V-Log/V-Gamut Reference Manual (Rev 1.0, 28 November 2014): “Gray output code with reflection of 18% is defined as 433, black output code with reflection of 0% as 128, and white output code with reflection of 90% as 602.”

In the table, IRE is a 0 to 100 scale for signal level, and a waveform display shows it. The code value is the number that the camera writes into the file. A 10-bit file has 1024 code values, numbered 0 to 1023. Input reflection describes the subject: a black card, a middle gray card, or a white card.

In V-Log, the code value for a white card with 90% reflectance is 602. ITU-R BT.709-6 sets nominal peak white for standard video at 940. Shown on a standard display without a conversion, V-Log's white card therefore sits well below full brightness, at the 61 IRE shown in the table above.

Values above 602 represent brighter parts of a scene, such as a window or the sky. Panasonic's V-Log/V-Gamut Reference Manual lists clipping codes of 896 or 911 for specified Varicam models and settings, which is where highlight detail ends on those cameras.

V-Log also lifts black. A black card is written at code value 128, where BT.709-6 sets black at 64, so the darkest parts of an unconverted clip show as dark gray.

With white lowered and black lifted, unconverted V-Log fills a narrower part of the display's range than a finished picture does. Contrast and saturation look muted until a conversion is applied.

Bit depth belongs in the same discussion. An 8-bit file has 256 values per channel, and a 10-bit file has 1024. A log curve puts a wider range of brightness into the same number of values, so each step covers more brightness.

ARRI states the consequence for its own curve in the LogC4 specification (23 January 2025). The document says that the curve “was designed for 12-bit encoding as its minimum quantization level”, and that 10-bit LogC4 “should not be used for archival or interchange”. That statement covers LogC4 only, and it is not a rule for every log format. The direction is general, because a log curve asks more of the bits than a standard profile does.

Unprocessed log can also make shadow noise more visible.

RED describes the effect in its RED 101 article on REDlogFilm and REDgamma: “REDlogFilm images will initially appear flat, with lighter and noisier shadows, along with darker and more abrupt highlights. Tones retain the full dynamic range and are not actually any noisier though they are just being displayed differently.”

The noise is not new. A log curve lifts the darkest part of the picture, so the camera records shadow detail instead of a flat black. The same lift makes the noise in the shadows visible. When you add the contrast in the grade, the shadows become dark again. Most of the visible noise disappears with them.

Underexposure does make the noise worse. If you record a dark picture and then lift it in the grade, you amplify the quietest part of the signal. Noise lives in that quiet part. Check your exposure before you blame the log profile.

Apple's own Log recording has a device requirement. The Final Cut Camera User Guide states that “Log recording requires iPhone 15 Pro or later.”

That requirement is Apple's, and it applies to Apple's own Log recording in Apple's camera apps. Log video on iPhone in general does not need it, and neither does a third-party camera app. A log profile is a tone curve that an app applies to the picture. An app can carry that curve itself and apply it to each frame as it records. Such an app does not wait for Apple to offer Apple Log on your phone.

Log Cam: RAW 4K Video Camera works in that second way. It does its own log encoding and applies the curve in its own GPU pipeline. It does not request Apple's Log, so its log profiles are not limited to the iPhones that Apple's Log covers. The app needs iOS 17.6 or later. The quoted sentence is a fact about Apple's feature, and not a verdict on your phone.

Apple does not publish a dynamic range figure in stops for Apple Log. Every 12-stop or 13-stop number in circulation is a third-party estimate.

A recorded log clip gets its normal contrast in your editing app, either from a conversion made for the profile you recorded in or from grading it by hand. The highlight and shadow detail the camera kept is still in the file, so you can darken a bright window or lift a shadow as you grade. That room to adjust, in a stage light, a sunset or another high-contrast scene, is a reason to record log video.

If playback differs between apps, check each app's color management and any display transform before adding a LUT.

If you want finished clips straight from the phone and do not plan to grade them, record with a standard profile, or bake a LUT into your recordings so each clip is saved with the LUT applied.