Specifications

CHAPTER 3
Application Program Interface
38 VPTEngine Component
VPTEngineGetWhitePointDrive 3
This function allows your application to determine the white point drive currently being
emitted from the display. This differs from the actual white point in that the white point
drive does not include the effects of ambient light, even if the user has indicated that
ambient light is present.
pascal VPTEngineResult
VPTEngineGetWhitePointDrive( VPTEngineComponent engineComponent,
CIE1931* whitePointDrive )
engineComponent
A valid instance of the VPTEngine component.
whitePointDrive
A structure that is passed back to the caller containing the measured
white point drive for the display.
Supplementary Information
White point drive is the color of white that would be emitted by the display if it were
placed in a dark room with no ambient light. Since the effects of ambient light can cause
significant shifts in the colors viewed by the user, your application should probably use
the VPTEngineGetActualWhitePoint function, which takes into account the effects
of ambient light.
VPTEngineGetReflectedAmbientLight 3
This function allows your application to determine the amount of ambient light being
reflected back at the user from the face of the display. The user determines the amount of
light being reflected, by means of the Accurate Color control panel.
pascal VPTEngineResult
VPTEngineGetReflectedAmbientLight( VPTEngineComponent
engineComponent, CIE1931* reflectedAmbientLight )
engineComponent
A valid instance of the VPTEngine component.
reflectedAmbientLight
A structure that is passed back to the caller containing the color and
intensity of the ambient light being reflected back at the user from
the face of the display.
▲
WARNING
Since the information returned by this function is essentially determined
by the user (with the help of the Accurate Color control panel), your
application should be cautious about assuming the information is
absolutely accurate. ▲