I think it's a matter of definining the starting point. There are "corrections" that the machines apply automatically during the process of turning a negative into a positive.
In my case, when I had access to local labs, WalMart just ran the film and let the machine do it's thing, "no correction".
The other labs "corrected" things manually after the machine did it's thing.
I found that the machines were better at correcting than the local humans.
Sending off the film to pro-labs where you have a relationship is a different beast. In this situation the lab corrects to a standard that is mutually developed.