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_GDIPlus and problem deleting an image

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Hi! I am using a simple function to put a watermark into another image. It works very well, but if then I try to delete the source image file (in the script below it is called $sFile) I have the error that the file is open in my process. Thanks in advance and sorry for my bad english.

Func _Watermark($sFile2, $sFile, $sLogo)
    Local $hImage1, $hImage2, $hGraphic

    _GDIPlus_Startup ()
    $hImage1 = _GDIPlus_ImageLoadFromFile ($sFile)   ; image
    $X1 = _GDIPlus_ImageGetWidth ($hImage1)
    $Y1 = _GDIPlus_ImageGetHeight ($hImage1)
    $hImage2 = _GDIPlus_ImageLoadFromFile ($sLogo)  ; logo
    $X2 = _GDIPlus_ImageGetWidth ($hImage2)
    $Y2 = _GDIPlus_ImageGetHeight ($hImage2)

    $hGraphic = _GDIPlus_ImageGetGraphicsContext ($hImage1)
    
    _GDIPlus_GraphicsDrawImage ($hGraphic, $hImage2, $X1-$X2-5, 5)
    _GDIPlus_ImageSaveToFile ($hImage1, $sFile2)  ; image watermarked

    _GDIPlus_ImageDispose ($hImage1)
    _GDIPlus_ImageDispose ($hImage2)
    _GDIPlus_ShutDown ()
EndFunc   ;==>_Watermark

 

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