ColourSpace's soon to be released ability to generate native LUTs up to 256^3 resolution means that for the first time madVR_Labs Envy users can really benefit from madVR's large native internal LUT size.
Calman is limited to 33^3 3D LUTs, as has been the case with ColourSpace.
Blow that restriction away for your madVR Envy!
ColourSpace LUT Generation Size info., as well as the madVR User Guide

Steve

For info - the madVR LUT upload from ColourSpace is presently 65^3, so using a 128^3 or similar LUT size within ColourSpace makes good sense to ensure Nyquist based processing.

Steve