code: private static int computeE3(int a, int b, int d, int e, int g, int h)
      {
          if (d == b && e != g || d == h && e != a)
          {
              return d;
          }
          return e;
      }
docs: Compute E3 pixel.
  
  @param a The a value.
  @param b The b value.
  @param d The d value.
  @param e The e value.
  @param g The g value.
  @param h The h value.
  @return The computed value.