for each pixel in {TAIL ~ the original image}, determining by one or more processors {HEAD ~ an alpha value} associated with the pixel and values of component colors of the pixel, and 
for each pixel in { TAIL ~ the original image } , determining by one or more processors { HEAD ~ an alpha value } associated with the pixel and values of component colors of the pixel , and
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH