ok first, here is my script : #include <GUIConstants.au3> HotKeySet("{F10}", "blur") Func blur() $dc = DllCall("user32.dll", "int", "GetDC", "hwnd", "") $memory_dc = DllCall("gdi32.dll", "hwnd", "CreateCompatibleDC", "hwnd", $dc[0]) $memory_bm = DllCall("gdi32.dll", "hwnd", "CreateCompatibleBitmap", "ptr", $dc[0], "int", @DesktopWidth, "int", @DesktopHeight) DllCall("gdi32.dll", "hwnd", "SelectObject", "hwnd", $memory_dc[0], "hwnd", $memory_bm[0]) DllCall("gdi32.dll", "int", "