WHITEPOINT

typedef struct _WHITEPOINT
{
   L_INT nWhitePoint;
   L_DOUBLE xWhite;
   L_DOUBLE yWhite;
} WHITEPOINT, * LPWHITEPOINT;

The WHITEPOINT structure specifies the spectrum of the white color.

Parameter	Description
nWhitePoint	Common white points. Possible values:
	Value	Meaning
	CIELAB_D50	D50 white point.
	CIELAB_D55	D55 white point.
	CIELAB_D65	D65 white point.
	CIELAB_D75	D75 white point.
	CIELAB_D93	D93 white point.
	CIELAB_CUSTOM	Use the values of xWhite and yWhite members.
	CIELAB_DEFAULT	Dfault (D55) white point.
xWhite	X value between 0.0 and 1.0.
yWhite	y value between 0.0 and 1.0.

Comments

LPWHITEPOINT is a pointer to a WHITEPOINT structure. Where the function parameter type is LPWHITEPOINT, you can declare a WHITEPOINT variable, update the structure's fields, and pass the variable's address. Declaring a LPWHITEPOINT variable is necessary only if your program requires a pointer.

WHITEPOINT is used with the CONVERSION_PARAMS structure.

Any of the predefined white points can be used or custom x and y values can be used in a xyY system with CIELAB_CUSTOM, Y is always 1.0.