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Look-Up Table (LUT): Meaning & Definition in Film

A Look-Up Table (LUT) is a file containing a predefined set of mathematical instructions to transform the color and tone of an image.

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The Digital Color Transformer

A Look-Up Table, or LUT, is a fundamental tool in digital filmmaking and photography. In simple terms, a LUT takes a specific input color value from an image and outputs a different, corresponding color value. It’s like a preset color-correction filter, but with a high degree of technical precision. LUTs are used for both technical and creative purposes and come in two main forms: 1D and 3D. A 3D LUT is far more powerful as it can adjust hue, saturation, and brightness values in combination, allowing for complex color transformations.

Technical and Creative Uses

LUTs are indispensable in a professional workflow for two primary reasons:

  1. Technical Conversion (Conversion LUTs): Digital cinema cameras often record in a ‘logarithmic’ or ‘log’ format. This produces a flat, low-contrast, desaturated image that preserves the maximum amount of detail in the highlights and shadows. To view this footage properly on a standard monitor, a technical LUT is applied. This LUT converts the image from the camera’s specific log format (e.g., Arri Log C, Sony S-Log3) to a standard viewing color space (e.g., Rec. 709). This is purely a technical conversion for accurate viewing.
  2. Creative Application (Creative LUTs): This is where LUTs are used for artistic effect. A colorist can create a specific ‘look’ for a film—such as a gritty bleach bypass effect, a warm vintage feel, or the popular teal-and-orange palette—and save it as a LUT. This creative LUT can then be applied to footage to achieve a consistent look across different scenes. Directors can even load these LUTs into on-set monitors to preview how the final graded image might look while they are still filming.

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More Filmmaking Terms

Entries filed on the same shelf as Look-Up Table (LUT), each with the one-line answer first. They are the words that usually come up in the same conversation.

All 913 terms

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    A step outline is a pre-writing document that breaks a story down into its core sequential steps, with each step typically describing a single scene in a short paragraph.

  • Storyboard Panel

    A storyboard panel is a single illustration within a larger storyboard that represents one specific camera shot and includes key production notes.

  • Animatic

    An animatic is a preliminary animated sequence, created by editing storyboard panels together and synchronizing them with a temporary soundtrack, to plan the timing and rhythm of a scene.

  • CPL

    An XML manifest defining the composition and playback instructions for a package.

  • HMI

    An HMI is a type of high-intensity discharge lamp that produces a powerful, daylight-balanced light, making it an industry-standard tool for film production.