GetRValue

The GetRValue macro retrieves an intensity value for the red component of a 32-bit red, green, blue (RGB) value.

BYTE GetRValue(
  DWORD rgb  // 32-bit RGB value
);
 

Parameters

rgb

Specifies an RGB color value.

Return Values

The return value is the intensity of the red component of the specified RGB color.

Remarks

The intensity value is in the range 0 through 255.

The GetRValue macro is defined as follows:

#define GetRValue(rgb)   ((BYTE) (rgb)) 
 

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in wingdi.h.

See Also

Colors Overview, Color Macros, GetBValue, GetGValue, PALETTEINDEX, PALETTERGB, RGB