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typedef struc _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. | |
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 an xyY system with CIELAB_CUSTOM, Y is always 1.0.