Say Healey 100, Keoke is right about the ability of the computer, it reads your sample with its optic eye and spues forth the correct formulation to match what it sees. That's different than just mixing according to original manufacturers spec. BUT, you are also right in my unhumble opinion that a skilled technician will really dial it in because he or she has the eye for colour. I have a good friend whom is of that pedigree. When he makes an adjustment to the paint, there are no complaints. NOW the real trick here is that not all these experts abouts here anymore have the pigments, etc, to mix lacquers.