The .cube extension is the industry standard for 3D Look-Up Tables. It is a text-based file that contains data mapping input colors to output colors.
. You don't just "rename" the file; you embed the LUT into a new Profile. Open any image in Photoshop. Filter > Camera Raw Filter tab, hold the Alt (Win) / Option (Mac) key and click the New Preset This opens the Create Profile menu. Check the box for Color Lookup Table at the bottom. Select your Give it a name and save. It will now appear as an profile in both Camera Raw and Lightroom. ⚡ Top Tools for Fast Conversion cube to xmp converter