Code Optimization [java]

I'm working on a project that requires that I use processing. I am not too proficient with Java. I have written these retard-tier methods:


  color removeFromColor(int c, int subtraction)
  {
    for (int i = 16; i >= 0; i -= 8) {
      if ((c >> i & 0xFF) - subtraction > 0) {
        c |= (0 << i);
      } else {
        c -= (subtraction << i);
      }
    }
    return c;   
  }
 
  color addToColor(int c, int addition)
  {
    for (int i = 16; i >= 0; i -= 8) {
      if ((c >> i & 0xFF) + addition > 255) {
        c |= (255 << i);
      } else {
        c += (addition << i);
      }
    }
    return c;
  }

As you can perhaps guess, I would prefer if these methods were written as one private (factory?) method, with two wrapper methods for add and remove that modify the behavior of the main method. Unfortunately, I am not skilled enough to come up with an elegant solution. All of my design attempts thus far have resulted in overly-complicated, unnecessary bloat, or at least worse code than if I had just stuck to keeping two very-similar-yet-different methods.

Since in practice these are working just fine at the moment, I am asking this only out of curiosity. How would you optimize this? Or would you bother at all?

OP wants us to do his homework for us, that's nice. Now get lost.