Incoming points must be in the [0-1] range, and outgoing points must map to the [0-1] range. The Inverse property must return a GeneralTransform that computes the inverse mapping.
The inverse transform maps a point from after the effect is applied to the point that it came from before the effect. The non-inverse transform maps a point from before the effect is applied to after the effect is applied.
Note that the transform does not include information about the physical pixel size being used, and it just operates in the unit range.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)