Looking first at {HEAD ~ modification} of {TAIL ~ the alpha value}, for each pixel in the design image a modified alpha value for that pixel is calculated based on the value of MIN and the original alpha of the pixel as follows: 
Looking first at { HEAD ~ modification } of { TAIL ~ the alpha value } , for each pixel in the design image a modified alpha value for that pixel is calculated based on the value of MIN and the original alpha of the pixel as follows :
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH