The modified pixel color is calculated by subtracting the level of gray in the original pixel color from {HEAD ~ each} of {TAIL ~ the three original component color values} and increasing any remaining color component values as a function of the modified alpha value of the pixel 
The modified pixel color is calculated by subtracting the level of gray in the original pixel color from { HEAD ~ each } of { TAIL ~ the three original component color values } and increasing any remaining color component values as a function of the modified alpha value of the pixel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL 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