Use LUT Editor to convert logarithmic images to linear images or linear images to logarithmic images, while maintaining color accuracy.

To access the LUT Editor menu, use:
Timeline, then use ConnectFX (See Creating ConnectFX).
This node accepts a front clip, and outputs a result.
The LUT Editor node can also be used to apply a conversion to 16-bit floating-point image in the OpenEXR file format.
The LUT Editor node can be set to output a bit depth of 8, 10, 12, or 16 bits. You can also manually set the variables for output.