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GDI supports Image Color Management (ICM) version 2.0. Display drivers can use ICM without implementing any special code.
If the display hardware supports a gamma ramp, the display driver should implement DrvIcmSetDeviceGammaRamp. Color-calibrating applications that require color exactness use this capability. DirectDraw also uses this function to allow DirectX applications — such as a game that performs palette animation in RGB modes — to control the gamma ramp. For example code, refer to the permedia sample display drivers.