Function Reference


Specifies whether gamma correction is enabled for a linear gradient brush

#include <GDIPlus.au3>
_GDIPlus_LineBrushSetGammaCorrection ( $hLineGradientBrush [, $bUseGammaCorrection = True] )


$hLineGradientBrush Pointer to a LinearGradientBrush object
$bUseGammaCorrection [optional] If True, gamma correction is enabled; otherwise gamma correction is disabled

Return Value

Success: True.
Failure: False and sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GPIP_ERR* see GPIPlusConstants.au3).


By default, gamma correction is disabled during creation of a LinearGradientBrush object.
Gamma correction is often done to match the intensity contrast of the gradient to the ability of the human eye to perceive intensity changes.

See Also

Search GdipSetLineGammaCorrection in MSDN Library.


#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>


Func Example()
        _GDIPlus_Startup() ;initialize GDI+
        Local Const $iWidth = 600, $iHeight = 300, $iBgColor = 0x303030 ;$iBGColor format RRGGBB

        Local $hGUI = GUICreate("GDI+ Example (" & @ScriptName & ")", $iWidth, $iHeight) ;create a test GUI
        GUISetBkColor($iBgColor, $hGUI) ;set GUI background color

        Local $hGraphics = _GDIPlus_GraphicsCreateFromHWND($hGUI) ;create a graphics object from a window handle
        _GDIPlus_GraphicsSetSmoothingMode($hGraphics, $GDIP_SMOOTHINGMODE_HIGHQUALITY) ;sets the graphics object rendering quality (antialiasing)
        Local $hBrush = _GDIPlus_LineBrushCreate(0, 0, 0, 280, 0xFFFFFF00, 0xFF4020FF, 1) ;create linear gradient flipped brush

        _GDIPlus_GraphicsFillRect($hGraphics, 10, 10, 280, 280, $hBrush) ;draw the filled rectangle


        _GDIPlus_GraphicsFillRect($hGraphics, 310, 10, 280, 280, $hBrush) ;draw the filled rectangle

        _GDIPlus_GraphicsDrawString($hGraphics, "w/o gamma correction", 14, 14)
        _GDIPlus_GraphicsDrawString($hGraphics, "w/ gamma correction", 314, 14)

        Until GUIGetMsg() = $GUI_EVENT_CLOSE

        ;cleanup GDI+ resources
EndFunc   ;==>Example