Specifications

CHAPTER 3
Application Program Interface
VPTEngine Component 37
engineComponent
A valid instance of the VPTEngine component.
lastCalTime The date and time of the most recent calibration.
VPTEngineGetTargetWhitePoint 3
This function allows your application to determine the user-set white point for the
display. The user-set white point differs from the actual white point achieved by the
display’s calibration process.
pascal VPTEngineResult
VPTEngineGetTargetWhitePoint( VPTEngineComponent engineComponent,
CIE1931* whitePoint )
engineComponent
A valid instance of the VPTEngine component.
whitePoint A structure that is passed back to the caller containing the target
white point for the display.
Supplementary Information
For most uses, the target white point and the actual white point should be fairly
interchangeable, although it is better to use the actual white point for maximum color
accuracy.
VPTEngineGetActualWhitePoint 3
This function allows your application to determine the actual white point achieved by
the display’s calibration process. This differs from the target white point, described
above, and includes the effects of ambient light on the display’s image surface.
pascal VPTEngineResult
VPTEngineGetActualWhitePoint( VPTEngineComponent engineComponent,
CIE1931* whitePoint )
engineComponent
A valid instance of the VPTEngine component.
whitePoint A structure that is passed back to the caller containing the actual
measured white point for the display.
Supplementary Information
For most uses, the target white point and the actual white point should be fairly
interchangeable, although it is better to use the actual white point for maximum color
accuracy. In the event that the AppleVision display is unable to match the white point
requested by the user perfectly, the white point returned by this function will closely
reflect the white point being emitted by the display.