Best solution

We need to use following image as neutral HALD CLUT Image. (Not square aligned one)

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/fdb3c88d-d03c-40e0-81d4-bd02d858f785/Neutral_64.png

I don't know why, but this square aligned LUT image does not work well. It depends on the parsing algorithm?

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/f45e6165-50f7-495c-ba77-f395f50f6d2a/neutral-lut.png

This website can download the neutral LUT image.

LUT Generator

This site has also nice tutorial and providing software.

IWLTBAP LUT Generator

Imprementations

This article explains very well how we create cube data for CIColorCube.