A three-dimensional lookup table (3D LUT) is used by the HOME UDX, HOME Color Corrector, and HOME Multiviewer to convert from one color space to another. A 3D LUT maps input colors to output colors. It maps a specific triple of red, green, and blue input values to a specific triple of red, green, and blue output values.
It would be infeasible to provide a mapping for each possible combination of (R, G, B) triples (at 12 bit color depth, there are ~68 billion combinations). Therefore, only a subset of the possible values is specified, and the values in between are interpolated—the HOME Apps use tetrahedral interpolation. A common format uses 33 values for each color axis, which is about 36 thousand points.