[argyllcms] Implementation of setting a black point

I'd like to know if there are any plans in implementing a command line switch for setting a luminance for the black point with dispcal. As colorimeters (and spectrophotometers?) mostly don't provide very accurate results in low luminance situations, I would find it desirable to set the luminosity "pure black" should have. This way you could also calibrate to a distinct contrast ratio. 

Regards,
Steffen

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