The Black Point Compensation option lets you control the output quality of shadow areas for CMYK source colors.

Use Black Point Compensation to enhance details in shadows when the CMYK source space is larger than the gamut of the printer. In proofing applications, when the CMYK source space is smaller than the gamut of the printer, do not use this option.

Black point compensation works by scaling the source colors so that the darkest point in the source profile maps to the darkest point in the output profile.