Together with ScrollX & ScrollY, this property determines the display of an image, which is magnified by ‘Zoom’ relative to an original size which is defined as 1 pixel = 1 screen pixel. This property is ignored if the image’s StretchToFit property is true. In order to find the value used at any given time, even if StretchToFit is true, use the ActualZoom property. These properties are over-ridden if a Presentation State is applied..