IWICDevelopRaw.GetWhitePointRGB

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface IWICDevelopRaw
extern (Windows)
HRESULT
GetWhitePointRGB
(
UINT* pRed
,
UINT* pGreen
,
UINT* pBlue
)

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