Fix was required because values was too big for rgb and breaking the brightness calculation.
Now we have the initial sat (70%) and the reduction to 60 if too bright working again.
We used to get the numeric value of the entrire md5 string which is a
128bit integer. We would then devide this by the maxval of a 128bit int.
There is no need for such huge computations. As we just require a value
between 0 and 255. Thus using two 16 bit values is more than enough to
get the precision we need. By just taking the MSB we get nearly
identical results.
