SetDeviceGammaRamp

[This is preliminary documentation and subject to change.]

The SetDeviceGammaRamp function sets the gamma ramp on direct color display boards having drivers that support downloadable gamma ramps in hardware.

BOOL WINAPI SetDeviceGammaRamp(
  HDC hDC,
  LPVOID lpRamp
);
 

Parameters

hDC

Specifies the device context of the direct color display board in question.

lpRamp

Pointer to a buffer containing the gamma ramp to be set. The gamma ramp is specified in three arrays of 256 WORD elements each, which contain the mapping between RGB values in the frame buffer and digital-analog-converter (DAC) values. The sequence of the arrays is red, green, blue.

Return Values

If this function succeeds, the return value is TRUE.

If this function fails, the return value is FALSE.

Remarks

Direct color display modes do not use color lookup tables and are usually 16, 24, or 32 bit. Not all direct color video boards support loadable gamma ramps. SetDeviceGammaRamp succeeds only for devices with drivers that support downloadable gamma ramps in hardware.

QuickInfo

  Windows NT: Requires version 4.0 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in icm.h.
  Import Library: Use gdi32.lib.

See Also

Color Management Overview, ICM 2.0 Functions