We have limited Hint to XPT, PRO, and HTP licenses as the process really needs a high-end probe to be effective, due to the need to have an accurate 'master/guide' profile.
After that, the secondary minimal profile (Quick Profile for example) is used to set the main parameters for the calibration - the peak RGBW values and the grey scale.
The two profile value sets do not need to be identical, as the two profiles are effectively 'normalised' before the Hint process is used.
The master/guide profile is then used to direct the interpolation of the 'missing' data during the LUT generation process.
This is v1 of the Hint process, and we have more plans for it...
One other process we have been playing with for situations where probes struggle with low-light accuracy is the merging of 2 LUTs generated from 2 different profiles.
For example, using a 21^3 for all data above, say, 10 nits.
And a Grey only profile for below 10 nits.
One of the issues with large profile data sets is the inaccuracy of the readings when the probe is struggling with low-light readings.
Obviously 'colour' readings have less brightness than Grey Scale readings, so cause more inaccuracy in the final calibration LUT.
Using Grey Only data for the low-light range meas such 'read' errors are not included in the LUT generation.
But at higher brightness levels the full volumetric profile data is needs to accurately map the volumetric calibration.
To do such LUT merging the LUT image can be used, via a graphics program such as Photoshop.
Basically you key through the low-luma range from the Grey Only generated LUT into the 21^3 generated LUT...
From this you can see how we can automated such capabilities within LightSpace/ColourSpace.