In the output maximizer, the best value is 1.0, and values close to 1.0 indicate that you are close to the virtual output maximizer.
For example, an output maximizer efficiency score 1.25 indicates that the output level could be increases to 125% while consuming the same amount, or even less, of the input resource.
Even though the maximizer function itself is quite simple, by viewing the contents of this file, you can get a good sense of GIMP's inner working.
