Imagine the little 32 x 32 square patches all stacked one upon the other, that would create a 32 x 32 x 32 RGB color cube, with which color transformations can be stored by simply applying them on this texture:
The term Lookup table means that the new color values don’t have to be calculated every time because they have been pre-calculated and stored in a table of values.ģD CLUTs are often processed and stored as 3D Cubic textures like this example generated with Blackmagic Fusion of a 32 x 32 x 32 value CLUT. are all defined as a function that for every color coordinate in the RGB color cube space defines the new coordinate where the corrected or stylized color is found. This means that the color correction operations we perform to create a color style, like adding contrast, saturation, warming the hues etc. To understand this we have to imagine RGB color encoding as a 3D space with the R, G and B values of each color being coordinates in this cubic color space. The reason CLUTs are referred to as “ 3D” color lookup tables or “ Cube LUT” is that they store the effect of color operations as linear transformations of a 3D cubic space. Why is this called a “3D” or “Cube” Lookup Table?
* More simple, daily use terms can be: “color styles”, or “color corrections”ĬLUTs are used in the movie production industry to perform color conversions of images acquired from different sources for monitoring and editing purposes, and also for testing, applying and sharing different creative color styles across different departments, and stages of the production.Įxamples of common CLUT file formats are *.3DL and *.CUBE Color Lookup Tables – CLUTs (also “ Color LUTs“) are a method of storing and reusing complex linear color transformations*.ĬLUTs have the advantages of being supported by many video and image processing software packages, and also the ability to be calculated in real-time on the GPU, costing very little computing resources.
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