A LUT, or lookup table, is a file that tells video software how to change one set of colors into another. In video editing, it is mainly used to convert flat camera footage into normal viewing color, match shots, or create a styled grade. A LUT does not “fix” footage by itself, but it can speed up color work when it is used with care.
TLDR: A LUT is a color translation chart for video. For example, an editor may apply a Log to Rec.709 LUT to Sony S Log3 footage so it looks normal instead of gray and washed out. On a 10 minute interview project with 40 clips, a good technical LUT can cut the first correction pass from about 45 minutes to 15 minutes. The final grade still needs human checks for exposure, skin tone, contrast, and shot matching.
What Does LUT Mean in Video Editing?
LUT stands for lookup table. It is a data file that maps input color values to output color values. If a pixel enters as one shade of red, green, and blue, the LUT tells the software what that pixel should become after the transform.
In plain terms, a LUT is like a preset for color. That comparison is useful, but not perfect. A preset may adjust sliders such as contrast, saturation, lift, gamma, or gain. A LUT usually works by remapping color values through a fixed table. It cannot read the scene. It does not know whether a face is too orange or a sky is clipped.
Common LUT file formats include .cube, .3dl, and .look. The .cube format is especially common in editing and grading tools such as DaVinci Resolve, Adobe Premiere Pro, Final Cut Pro, and Avid Media Composer.
How Lookup Tables Work
A video image is built from color values. Most editing systems describe each pixel through RGB channels: red, green, and blue. A LUT stores instructions for changing those values.
For example, a LUT may say that a dull blue should become richer, shadows should lean cooler, and midtones should gain contrast. The software compares the source pixel to the LUT table, then outputs the new color. When the exact value is not listed, the software estimates the result through interpolation.
There are two main types:
- 1D LUTs: These adjust values on a single channel or tone curve. They are often used for gamma changes, brightness response, or simple technical transforms.
- 3D LUTs: These map red, green, and blue together in a three dimensional color grid. They can change hue, saturation, contrast, and color relationships in a more detailed way.
A 3D LUT is more common for creative looks. It can push shadows toward teal, warm up highlights, and reduce certain greens. That is why many commercial “cinematic LUT packs” use 3D LUTs.
The catch is that a LUT is fixed. If two clips have different exposure, the same LUT may make one clip look polished and the other look awful. Honestly, it feels like some software makes this worse by hiding LUT strength controls behind extra menus, adding a few annoying seconds to every clip adjustment.
Technical LUTs vs Creative LUTs
Not all LUTs serve the same job. Most fall into two broad groups: technical LUTs and creative LUTs.
Technical LUTs
A technical LUT converts footage from one color space or gamma curve to another. A common example is Log to Rec.709. Many cameras shoot in Log formats such as S Log3, C Log, V Log, N Log, or LogC. These profiles preserve highlight and shadow detail, but they look flat before correction.
A technical LUT turns that flat image into a normal display image. It does not create a “movie look” by itself. It simply places the footage into a standard viewing range.
Creative LUTs
A creative LUT adds style. It may create a warm commercial look, a cold thriller look, a faded film effect, or a high contrast music video style. These LUTs are used during color grading, not basic correction.
The problem is that many creative LUTs are sold as magic fixes. They are not. If footage is underexposed, badly white balanced, or shot under mixed lighting, the LUT may exaggerate the problem.
How LUTs Are Used for Color Correction
Color correction is the process of making footage look clean, balanced, and consistent. It comes before creative grading. During correction, an editor or colorist adjusts exposure, contrast, white balance, saturation, and shot matching.
A LUT can help with correction in these cases:
- Converting Log footage: A camera specific LUT can transform flat footage into Rec.709.
- Monitoring on set: A director can view a normal looking image while the camera records flat Log footage.
- Matching camera systems: LUTs can help bring different cameras closer before manual tweaks.
- Speeding up dailies: Editorial teams can apply a standard viewing LUT so rough cuts do not look washed out.
For color correction, the best approach is usually simple. First, the editor balances exposure and white balance. Then a technical LUT can be applied, or applied before fine tuning depending on the workflow. After that, scopes should be checked. Waveform, vectorscope, and RGB parade views often reveal problems the eye misses.
How LUTs Are Used for Color Grading
Color grading shapes the mood of the image. It is where the footage becomes warm, gritty, soft, glossy, tense, calm, or stylized. LUTs are popular here because they give editors a starting point.
A colorist may apply a film print emulation LUT to add contrast and color density. A wedding editor may use a soft warm LUT for skin tones and highlights. A travel filmmaker may choose a punchy LUT with deeper blues and greens.
Still, the LUT should rarely sit at 100% without checks. Many editors reduce LUT intensity to 20% to 70%, then adjust contrast, saturation, and curves around it. This keeps the grade from crushing shadows, clipping highlights, or turning skin into plastic.
Best Practices for Using LUTs
- Use the right LUT for the camera profile. A C Log LUT is not meant for S Log3 footage.
- Correct exposure first when needed. A LUT cannot save a badly exposed image.
- Check skin tones. Skin should not drift too far toward green, red, or magenta.
- Use scopes. Eyes adapt. Scopes do not.
- Adjust LUT strength. Full power often looks too harsh.
- Apply LUTs in the right node or layer order. In many workflows, the technical transform comes before the creative look.
Common LUT Mistakes
One common mistake is stacking LUTs without understanding what each one does. A technical conversion LUT followed by a creative LUT can work well. Three random creative LUTs stacked together usually create crushed blacks, strange skin, and noisy color.
Another mistake is using a LUT as a replacement for lighting. If a face is lit by a green office lamp, a cinematic LUT will not make it look like a controlled film set. It may make the green cast stronger.
Editors should also watch for banding and clipping. Low bit depth footage, such as some 8 bit camera files, can break apart under heavy LUTs. Subtle grades often hold up better.
FAQ
What is a LUT in simple terms?
A LUT is a color conversion file. It tells editing software how to change colors and tones in footage.
Is a LUT the same as a filter?
Not exactly. A filter is a broad visual effect. A LUT is a color mapping table, though many people use creative LUTs like filters.
Can a LUT fix bad footage?
No. It can improve a well shot clip or speed up correction, but poor exposure, bad focus, and ugly lighting still need separate work.
Should LUTs be used before or after color correction?
It depends on the workflow. Technical LUTs are often used early. Creative LUTs are usually added after the image is balanced.
What is the most common LUT format?
The .cube format is one of the most common formats across major video editing and color grading apps.
Are paid LUTs better than free LUTs?
Sometimes, but not always. A good LUT fits the footage, camera profile, and project style. Price alone says little.