What Is a LUT File? A Beginner's Guide to Color Grading
LUT files are a cheat code to cinematic color grades. Here's exactly what they are, how they work, and how to start using them today.
If you've ever watched a film and thought "how does that footage look so cinematic?", the answer is almost always a LUT.
LUT files are one of the most powerful and misunderstood tools in video editing. Once you understand them, you'll use them on every project.
What Does LUT Stand For?
LUT stands for Look-Up Table. At its core, a LUT is a mathematical file that maps one set of colors to another. You feed it a color value (say, a flat, dull orange), and it outputs a transformed color (a rich, warm amber).
Think of it like a translator: your raw footage speaks one color language, and the LUT translates it into the look you want.
How Do LUTs Work?
Every pixel in your video has a color value — a combination of red, green, and blue. A LUT contains a pre-calculated table that says: "when you see this RGB value, output that RGB value instead."
This happens in real-time, across millions of pixels, in a fraction of a second. That's what makes LUTs so efficient — the complex color math is done once, baked into the file, and then applied instantly.
There are two main types:
- 1D LUTs — adjust brightness and contrast per channel (R, G, or B independently). Fast and lightweight.
- 3D LUTs — map all three channels together, enabling much more complex color transformations. These are what most filmmakers use.
LUT vs. Preset: What's the Difference?
A preset (like a Lightroom preset) stores a list of slider values, e.g. exposure +0.3, contrast +15, etc. Apply it to a different photo and those sliders move.
A LUT is output-based. It doesn't store slider positions — it stores the result of those adjustments as a direct color mapping. That makes LUTs:
- Faster to apply (no sliders to recalculate)
- More portable across different software
- Non-destructive — your original footage is untouched
Common LUT File Formats
| Format | Extension | Used In |
|---|---|---|
| Cube | .cube | DaVinci Resolve, Premiere Pro, Final Cut Pro, CapCut |
| 3DL | .3dl | Autodesk products |
| CSP | .csp | Nuke, some cameras |
The .cube format is by far the most universal. If you're making LUTs to share or sell, .cube is the one to use.
Technical vs. Creative LUTs
Not all LUTs are created equal. There are two distinct categories:
Technical LUTs convert between color spaces. For example, converting S-Log3 footage from a Sony camera into Rec. 709 (standard video color space). These aren't about "look" — they're about accuracy.
Creative LUTs are purely aesthetic. They impose a specific mood, film stock emulation, or cinematic grade on top of your already-corrected footage.
The right workflow is: technical LUT first → then creative LUT on top.
How to Apply a LUT
Most editing software supports LUTs natively:
- DaVinci Resolve — Color page → LUTs panel → drag onto a node
- Premiere Pro — Lumetri Color → Creative → Look → Browse
- Final Cut Pro — Effects → Color → Custom LUT
- CapCut — Filters → Import LUT
If the software doesn't support LUT import directly, you can use a tool like Luttie to apply your LUT to an image preview and export a new LUT in a compatible format.
Creating Your Own LUT
Until recently, creating a custom LUT required expensive, heavy software like DaVinci Resolve Studio or specialized plugins. Now you can create one directly in your browser with Luttie's free LUT editor — adjust curves, HSL, shadows, and highlights, then export a .cube file ready for any NLE.
Summary
- A LUT is a color mapping file — it transforms one set of colors into another
- 3D LUTs are the standard for video work;
.cubeis the most compatible format - Technical LUTs correct color space; creative LUTs impose a look
- Apply technical correction first, creative LUT second
- You can build your own custom LUTs for free with Luttie