What is a LUT and how is it used in a commercial color workflow?

• A. A LUT is a calibration target used on set.
• B. A LUT maps color values to achieve consistent looks; used for quick, repeatable color adaptation across scenes.
• C. A LUT is a file format that stores raw sensor data.
• D. A LUT is a device used to measure color in real time.

Answer: (B)

Think of a LUT as a Look-Up Table that maps input color values to output values, creating a consistent color transformation. In a commercial color workflow, LUTs let you apply a chosen look quickly and keep it consistent across all footage—across cameras, scenes, and lighting. They’re especially useful when footage is shot in a wide color space or with log gamma, because a LUT can convert it to the target delivery space (like Rec.709 or P3) while imprinting a desired mood. On set, monitor LUTs give a realistic preview of the final result; in post, colorists apply the same LUT to align color across shots and speed up grading. There are 3D LUTs, which transform RGB triplets for complex adjustments, and 1D LUTs, which adjust each channel more simply. LUTs can be used non-destructively in the workflow or baked into footage for delivery. They are not calibration targets, raw sensor data formats, or real-time color-measuring devices.