How to Create Custom LUTs for Lumafusion

Creating custom LUTs (Lookup Tables) for LumaFusion is a powerful way to streamline your post-production workflow and ensure consistent color grading across your entire project. A LUT is essentially a 3D matrix of color values that maps input colors to new output colors, allowing you to apply a specific aesthetic with a single tap. For mobile filmmakers, this means moving away from manual slider adjustments for every single clip and instead using a standardized look that can be tweaked later. The process involves generating a reference image, applying your desired grade, and exporting that grade as a `.cube` file. Once you have this file, you can import it directly into LumaFusion’s color panel. This tutorial will walk you through the essential steps to design, export, and apply your own unique LUTs, giving you full creative control while saving hours of repetitive work. Whether you are aiming for a cinematic teal-and-orange look or a moody, desaturated film style, mastering this technique will elevate the professional quality of your mobile productions.

Understanding the LUT Format

Before diving into the technical steps, it is crucial to understand what a LUT actually does. A LUT does not add contrast or saturation directly; rather, it shifts pixel values from one color space to another. In the context of mobile filmmaking, you are typically working within the Rec. 709 color space. When you create a LUT, you are defining how every possible color in your footage should be transformed. It is important to note that LUTs are not magic. If your source footage is severely underexposed or has bad white balance, a LUT cannot fix it. You must always perform basic corrections—exposure, white balance, and contrast—before applying your LUT. This ensures that the color grade interacts correctly with the image data. Think of the LUT as the final layer of flavor, not the foundation of the dish.

Preparing Your Source Footage

To create an effective LUT, you need a high-quality source image or video clip. Ideally, this should be a flat or log-encoded clip if you are working with higher-end mobile cameras, but for standard Rec. 709 footage, a well-exposed, neutral image works best. Avoid clips with extreme highlights or deep shadows, as these can distort the color mapping in the LUT. A medium gray or skin tone is an excellent reference point. If you are using a desktop color grading application to generate the LUT, ensure that your source material matches the aspect ratio and resolution you typically use in LumaFusion. This consistency prevents unexpected cropping or scaling issues when you bring the LUT back into your mobile workflow.

Generating the LUT File

While LumaFusion allows you to import LUTs, it does not natively export them as `.cube` files directly from the app in all versions. Therefore, the most reliable method is to use a dedicated desktop tool or a third-party mobile app that supports LUT generation. For desktop users, software like DaVinci Resolve, Adobe Premiere Pro, or even specialized tools like LUTify can generate these files. The process involves setting up a 33x33x33 or 65x65x65 point LUT, which provides enough granularity for smooth color transitions. Apply your desired grade to a test image, then use the "Export LUT" function. Make sure to name your file clearly, such as "Cinematic_Warm_33.cube," to keep your library organized. If you are strictly mobile, look for apps like "LUT Creator" or "Color Grading" that offer export capabilities to `.cube` format.

Importing LUTs into LumaFusion

Once you have your `.cube` file, transferring it to your iOS or Android device is the next step. On iOS, you can use the Files app to store the file in the LumaFusion folder or simply keep it in iCloud Drive. Open LumaFusion, navigate to a color grade node, and look for the LUT icon, which usually resembles a grid or a cube. Tap the import button and browse to the location of your `.cube` file. LumaFusion will process the file, and you should see it appear in your LUT library. You can then select it to apply the grade to your clip. If the LUT does not appear, double-check that the file extension is correct and that the file is not corrupted. A common mistake is using a `.cube` file that was saved as a text file without the proper extension, which prevents LumaFusion from recognizing it.

Refining and Saving Presets

Applying a LUT is just the beginning. LumaFusion allows you to adjust the intensity of the LUT using a slider, which is incredibly useful for blending the look with your base image. You can also layer additional color adjustments on top of the LUT, such as tint, temperature, or HSL wheels, to fine-tune the result. Once you are satisfied with the look, save the entire color grade as a preset. This ensures that not only do you have the LUT, but you also have the specific adjustments that make the LUT work best for your footage. This creates a reproducible workflow where you can apply your signature look in seconds.

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