What is a LUT and how is it typically used in the color pipeline?

• A. Look-up table used to map color values to achieve a desired look or convert log footage to a standard color space like Rec.709.
• B. A unit of measurement for luminance in a scene.
• C. A filter that adjusts only the white balance.
• D. A tool that records audio tone mapping.

Answer: (A)

A LUT is a Look-Up Table, a precomputed mapping that takes input color values and outputs new ones. In the color pipeline, footage from a camera (often in log or a specific camera color space) is transformed by applying a LUT to move it into a standard display space like Rec.709. This mapping also enables applying a specific look—changing how colors, contrast, and gamma respond across the image—so you can preview and deliver a consistent result quickly. A 3D LUT is commonly used because it can map whole RGB triples, allowing both color space conversions and creative grading in a single step. This concept fits the idea of transforming color values to reach a target appearance, rather than measuring luminance, adjusting only white balance, or mapping audio tones.