Specifies the left of the rectangle to acquire measured in inches.
Note: ◼Not supported for DCIM retrieval (i.e. when SelectedAcquireSource.Api = ieaDCIM). With WIA ensure you set AcquireFrameLeft/AcquireFrameTop before AcquireFrameRight/AcquireFrameBottom ◼This property is affected by the Twain Compatibility option: ietcExplicitAcquireFrame