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ludics
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here's an example fro the Emboss.au3 sample that comes with AutoIt.

#include <GDIPlus.au3>
#include <ScreenCapture.au3>

Opt("MustDeclareVars", 1)

; ===============================================================================================================================
; Description ...: Shows how to emboss text on an image
; Author ........: Paul Campbell (PaulIA)
; Notes .........:
; ===============================================================================================================================

; ===============================================================================================================================
; Global variables
; ===============================================================================================================================
Global $hBitmap, $hImage, $hGraphic, $hFamily, $hFont, $tLayout, $hFormat, $aInfo, $hBrush1, $hBrush2, $iWidth, $iHeight, $hPen
Global $sString="  Created with AutoIt  "

; ===============================================================================================================================
; Main
; ===============================================================================================================================

; Initialize GDI+ library
_GDIPlus_StartUp()

; Capture screen
$hBitmap  = _ScreenCapture_Capture(@MyDocumentsDir & '\AutoItImage.bmp')

; Load image and emboss text
$hImage   = _GDIPlus_ImageLoadFromFile(@MyDocumentsDir & '\AutoItImage.bmp')
$hGraphic = _GDIPlus_ImageGetGraphicsContext($hImage)
$hFamily  = _GDIPlus_FontFamilyCreate("Arial")
$hFont    = _GDIPlus_FontCreate($hFamily, 16, 1)
$tLayout  = _GDIPlus_RectFCreate(0, 0)
$hFormat  = _GDIPlus_StringFormatCreate(2)
$hBrush1  = _GDIPlus_BrushCreateSolid(0xA2FFFFFF)
$hBrush2  = _GDIPlus_BrushCreateSolid(0xC4FF0000)
$hPen     = _GDIPlus_PenCreate(0xC4000000, 2)
$aInfo    = _GDIPlus_GraphicsMeasureString($hGraphic, $sString, $hFont, $tLayout, $hFormat)
$iWidth   = DllStructGetData($aInfo[0], "Width" )
$iHeight  = DllStructGetData($aInfo[0], "Height")

_GDIPlus_GraphicsFillRect($hGraphic, 0, 0, $iWidth, $iHeight, $hBrush1)
_GDIPlus_GraphicsDrawRect($hGraphic, 1, 1, $iWidth, $iHeight, $hPen   )
_GDIPlus_GraphicsDrawStringEx($hGraphic, $sString, $hFont, $aInfo[0], $hFormat, $hBrush2)

; Save image
_GDIPlus_ImageSaveToFile($hImage, @MyDocumentsDir & '\AutoItImage2.bmp')

; Free resources
_GDIPlus_PenDispose         ($hPen    )
_GDIPlus_BrushDispose       ($hBrush1 )
_GDIPlus_BrushDispose       ($hBrush2 )
_GDIPlus_StringFormatDispose($hFormat )
_GDIPlus_FontDispose        ($hFont   )
_GDIPlus_FontFamilyDispose  ($hFamily )
_GDIPlus_GraphicsDispose    ($hGraphic)
_GDIPlus_ImageDispose       ($hImage  )
_GDIPlus_ShutDown()

; Show image
Run("MSPaint.exe " & '"' & @MyDocumentsDir & '\AutoItImage2.bmp"')
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