{HEAD ~ An image processing system} employs a scanner to generate an image having gray content from {TAIL ~ an input halftone image} 
{ HEAD ~ An image processing system } employs a scanner to generate an image having gray content from { TAIL ~ an input halftone image }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL