143 void CMSEXPORT cmsXYZ2Lab(const cmsCIEXYZ* WhitePoint, cmsCIELab* Lab, const cmsCIEXYZ* xyz)  in cmsXYZ2Lab()  argument
147     if (WhitePoint == NULL)  in cmsXYZ2Lab()
148         WhitePoint = cmsD50_XYZ();  in cmsXYZ2Lab()
150     fx = f(xyz->X / WhitePoint->X);  in cmsXYZ2Lab()
151     fy = f(xyz->Y / WhitePoint->Y);  in cmsXYZ2Lab()
152     fz = f(xyz->Z / WhitePoint->Z);  in cmsXYZ2Lab()
161 void CMSEXPORT cmsLab2XYZ(const cmsCIEXYZ* WhitePoint, cmsCIEXYZ* xyz,  const cmsCIELab* Lab)  in cmsLab2XYZ()  argument
165     if (WhitePoint == NULL)  in cmsLab2XYZ()
166         WhitePoint = cmsD50_XYZ();  in cmsLab2XYZ()
172     xyz -> X = f_1(x) * WhitePoint -> X;  in cmsLab2XYZ()
173     xyz -> Y = f_1(y) * WhitePoint -> Y;  in cmsLab2XYZ()
174     xyz -> Z = f_1(z) * WhitePoint -> Z;  in cmsLab2XYZ()