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Synopsis
ilutinfo lut_file [lut_file...]
Description
Prints header information about a lookup LUT file, such as its type, the channels it affects, sampling type, etc.
Type
The general type of the LUT.
1D
A curve-based lookup table. May affect R,G,B and/or A.
3D
A cube-based lookup table (RGB only)
3D+prelut
A cube-based lookup table with a single curve LUT which RGB is run though before the cube.
Size
The number of entries in the LUT. For 1D LUTs, this is the number of data samples in each curve. For 3D LUTs, this is the cube size (number of RGB triplets will be size^3). For 3D+preluts, the 1D curve size and the 3D cube size is reported.
LUT Channels
For 1D LUTs, the number of curves and the channels they affect (R,G,B,A).
Sampling
Whether the LUT is linearly or logarithmically sampled. In a linear LUT, the samples have the same sampling interval. Logarithmic LUTs have short intervals near the low end of the LUT and longer intervals at the end.
Precision
Binary LUTs can be saved in full (32b floating point) or half (16b floating point precision). The latter sacrifices some precision for smaller file sizes (and texture sizes, when used as a display LUT).
Input Range
The color range which is modified by the LUT. Values outside this range are clamped to this range.
Output Range
The output color range produced by the LUT, given values in the input range.
Black/white
Defines what value black and white are, from the LUT’s perspective. Generally this is 0,1 (for floating point color), but could be 0,255 is the LUT was expressed in 8b fixed values.