As mentioned above, in the described embodiment, the original alpha value {TAIL ~ OA} of {HEAD ~ all design image pixels} is typically set as 1 
As mentioned above , in the described embodiment , the original alpha value { TAIL ~ OA } of { HEAD ~ all design image pixels } is typically set as 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH