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GetDeviceGammaRamp function

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

Syntax


BOOL WINAPI GetDeviceGammaRamp(
  HDC hDC,
  LPVOID lpRamp
);

Parameters

hDC

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

lpRamp

Points to a buffer where the function can place the current gamma ramp of the color display board. 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 value

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. GetDeviceGammaRamp succeeds only for devices with drivers that support downloadable gamma ramps in hardware.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Wingdi.h

Library

Gdi32.lib

DLL

Gdi32.dll

See also

Basic Color Management Concepts
Functions

 

 

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