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LUT - Look-up table. This is a table of multipliers used to convert values from one type of digital scale to another. The LUT will contain a distinct multiplying value for every input digital value. For example, a LUT can be used to convert brightness values measured by an electronic sensor, which will be linear, to logarithmic values which more accurately reflect our perception – and the way film responds to light. As modern post production equipment is expected to work across media – film, TV, DVD, D-cinema, etc., there is increasing need for conversions using LUTs to suit differences in color space between display systems as well as in the media themselves.

See Also – Color Management, Color Cube (3D LUT)