The clipping boundary determines the portion of an image outside the boundary that
is hidden. The visibility of the clipping boundary is controlled by the FRAME system
variable.

The boundary you specify must be in a plane parallel to the PDF underlay.

The following prompts are displayed.

Select PDF to clip

Specifies which underlay you want to modify.

On

Turns on clipping and displays the PDF underlay clipped to the previously defined
boundary.

Off

Turns off clipping and displays the entire PDF underlay and frame.

If you re-clip the PDF underlay while clipping is turned off, clipping is automatically
turned back on. You are prompted to delete the old boundary even when clipping is
turned off and the clipping boundary is not visible.

Delete

Removes a predefined clipping boundary and displays the full original underlay.

New boundary

Defines a rectangular or polygonal clipping boundary, or generates a polygonal clipping
boundary from a polyline.

NOTE: You can only create a new clipping boundary for a selected PDF underlay when the
old boundary is deleted.

• Select polyline. Defines the boundary with the selected polyline. The polyline can be open but must
  consist of straight line segments and cannot intersect itself.
• Polygonal. Defines a polygonal clipping boundary with three or more points that you specify
  for the vertices of a polygon.
• Rectangular. Defines a rectangular boundary with the points that you specify for opposite corners.
• Invert clip. Inverts the mode of the clipping boundary: objects are clipped either outside the
  boundary or inside the boundary.