Rec.709 LUT: which one your footage actually needs

Most people meet the phrase "Rec.709 LUT" while staring at a grey, washed-out clip and searching for whatever fixes it. That instinct is right, and the terminology is doing its best to confuse you: the thing you need is not a filter or a look, it is a conversion back to normal.

What Rec.709 is

Rec.709 is the colour standard that ordinary screens are built around — phones, laptops, televisions, Instagram, YouTube. When a video "looks normal", it is almost always Rec.709.

Your camera, if you set it to a log profile, deliberately does not record in Rec.709. It records flat and desaturated in order to keep detail in the highlights and shadows that a contrasty profile would throw away. That flat image is not broken. It is unfinished, and it is unfinished on purpose.

A Rec.709 LUT is the instruction that finishes it. If you have not met the underlying idea, what a LUT actually is covers it in five minutes and the rest of this page will make more sense afterwards.

Two very different things get called a "Rec.709 LUT"

This is the single biggest source of disappointing results, and it is worth being blunt about.

A conversion LUT is closer to a translation than a treatment. There is a correct answer, and it depends on what your camera recorded. A creative LUT is a preference, and there is no correct answer at all.

Packs sold as "cinematic Rec.709 LUTs" usually contain the second kind while implying the first. Applied to log footage with no conversion underneath, they produce the thin, plasticky result people blame on their camera. The distinction between correcting and styling is the whole of colour correction versus colour grading, and it decides the order of everything below.

Which conversion LUT your footage needs

Match the profile you actually shot, not the brand of the camera. A Sony body can record S-Log2, S-Log3 or HLG, and they are not interchangeable.

Two footnotes that save an evening each. The gamut matters as much as the curve — an S-Log3 LUT built for S-Gamut3.Cine will be slightly off on S-Gamut3, usually visible first in reds. And LUTs are not exposure fixes: a conversion assumes the footage was exposed the way the profile expects, so if you underexposed by a stop, correct that before the LUT rather than trying to grade your way out afterwards.

Where to get one

In this order, and the first line is not a formality:

1. Your camera manufacturer. Sony, Canon, Panasonic, Nikon, Fujifilm and Blackmagic all publish conversion LUTs for their own profiles, free. They are built by the people who designed the curve.
2. Your editor's built-in transform. Resolve's colour management and the conversion LUTs shipped with Premiere and Final Cut are legitimate and often cleaner than a download.
3. A reputable free pack, for looks rather than conversions — where the good free LUTs come from is the honest version of that search.

Be sceptical of anything charging for a "Sony to Rec.709 conversion". That file exists for free from Sony.

Apply it first, then grade

The order is the part that goes wrong, and it goes wrong quietly.

1. Balance the shot — exposure and white balance, before any LUT.
2. Apply the conversion LUT. This is your base, not your finished image.
3. Grade on top, on a separate node or adjustment layer.
4. Check skin, which is where every error shows first.

A conversion LUT is not meant to be the last word. It lands you in a correct, neutral Rec.709 image that still needs contrast and taste — that is normal, and a base that looks slightly flat is a base that left you room. Applying a look underneath a conversion, or stacking two conversions, produces crushed shadows and orange faces, and no amount of adjustment afterwards recovers it. Skin tones are the one thing a grade must not break is the check worth running before you export.

For the mechanics in a specific application: adding LUTs in DaVinci Resolve, LUTs across a bin in Premiere Pro, or across a project in Final Cut.

The part that does not scale

All of the above is one clip. The problem is that nobody shoots one clip.

A conversion LUT is identical for every file from the same profile, which makes applying it by hand a genuinely pointless use of an evening — 300 files, the same transform, one at a time, with the strength nudged per clip because exposure drifted across the shoot.

BatchTone exists for that specific job: point it at a folder, choose the .cube conversion for your profile, and it applies it across every photo and video file in one pass, with a per-file strength dial for the clips that were exposed a little differently. It is not an editor and does not try to be one — the grade still happens in Resolve or Premiere afterwards, on footage that is already in Rec.709. There is a seven-day trial with everything unlocked.

Common questions

Is Rec.709 the same as sRGB?

Nearly, and not exactly. They share the same primaries and white point, so colours land in the same place, but their transfer curves differ slightly. In practice video uses Rec.709 and stills use sRGB, and the mismatch is rarely visible.

Do I need a LUT if I did not shoot log?

No. Standard, Natural, Neutral and phone profiles already record Rec.709, so there is nothing to convert. A creative LUT is still optional on top.

Why does my footage look worse after applying a Rec.709 LUT?

Usually one of three things: the LUT is for a different profile than you shot, the clip was not Rec.709 to begin with, or a conversion has been applied twice. Check the profile in your camera's metadata first.

Can one Rec.709 LUT work for every camera?

No. Each manufacturer's log curve is a different shape, so a conversion built for S-Log3 will be visibly wrong on V-Log or D-Log. Only creative looks travel between cameras.

Should I apply the LUT in camera or in post?

In post. Log recording is the reason you have latitude at all; baking Rec.709 in at capture throws away the highlight and shadow detail you shot log to keep. Use a monitoring LUT on the screen if you want to see the result while filming.