The value of the elements in {HEAD ~ the resulting data array} indicate the brightness of {TAIL ~ their corresponding pixels} in the image array 51 
The value of the elements in { HEAD ~ the resulting data array } indicate the brightness of { TAIL ~ their corresponding pixels } in the image array 51
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH