HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 145)

EN
Erasing frames 145
Erasing the center line or dark border from the
copies of bound documents
Use Book Frame Erase to remove the dark border, center lines, and
contour lines (between pages) from copies of bound documents like
books or magazines.
Figure 32 Image with center line and dark border erased
Original
Book Frame
Erase
not selected
Book Frame
Erase selected
Copy