Camera calibration tab in ACR ...

When we slide the saturation slider for a primary to the left end (completely desaturated position), does it mean that we move this primary to the white point on the chromaticity diagram? Thanks ...

Jeff Schewe wrote:
Moving the camera calibration saturation sliders to -100 does not completely desaturate the RGB colors. It only moves the saturation in a range useful for camera calibration–you would never need to completely desaturate a sensors colors for the purposes of calibration.
I see ... but as ssprengel said, if you desaturate three primaries -250 in total, input profiles on the camera calibration tab can be made monochrome. I think that the range of saturation sliders are going beyond which are required for just fine tuning camera profiles. Am I missing something?

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