Export (0) Print
Expand All
Expand Minimize

SetDeviceGammaRamp Function

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

Syntax

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. The RGB values must be stored in the most significant bits of each WORD to increase DAC independence.

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

Requirements

Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Header

Wingdi.h

Library

Gdi32.lib

DLL

Gdi32.dll

See Also

Basic Color Management Concepts
Functions

 

 

Send comments about this topic to Microsoft

Build date: 11/16/2010

Community Additions

ADD
Show:
© 2014 Microsoft