Ok - I will provide some additional help.
CMFs can only be applied correctly/accurately to spectral data.
When taking calibration measurements XYZ (converted to Yxy for graphing) data is used, as can be seen in ColourSpace profiles.
You cannot accurately apply an alternative CMF to the measured XYZ data.
Some Spectros have the ability to use different CMFs within the probe, before the spectral measurement data is converted into XYZ.
We offer those settings for those spectros that have that capability.
And yes, while all tristimulus colourimeters have their CMF fixed by the filters used, when you probe match to a spectro that is using a different CMF you are matching to that CMF.
That is an 'approximation', but nevertheless it is matching the CMF as in use by the spectro.
It is this 'approximation' that some other calibration software provides as post-measurement CMF adjustments, for spectros and colourimeters.
It is not correct/accurate.
(The concept of the colour space target for different CMFs is a big part of this approximation. )It is also a big part of why we developed the concept of
Perceptual Colour Matching.
Steve
Steve Shaw
Mob Boss at Light Illusion