public static extern void CmsXYZ2Lab(ref ColorCIEXYZ wp, out ColorCIELab lab, ref ColorCIEXYZ xyz);
public static extern void CmsLab2XYZ(ref ColorCIEXYZ wp, out ColorCIEXYZ xyz, ref ColorCIELab lab);
public static extern void CmsLCh2Lab(out ColorCIELab lab, ref ColorCIELCh lch);
public static extern void CmsLab2LCh(out ColorCIELCh lch, ref ColorCIELab lab);