Those computers scan the paint and give an "approximate" match. Up to the paint store (or the painter) to tint that to get an exact match and yes, I think that's a dying art. Back in the 70's I was a full time painter and you had to be able to tint and match paint and I got to be good at it (good teacher, an old painter that had been painting since the 40's). A couple years ago the local paint shop couldn't match a color I needed, I talked them into letting me in the mixing room to do it myself. They ended up hiring me as a part time consultant, I'd go in and match tough colors for them, their employees, nor the owner could match paint worth a darn! Lost art indeed I guess. The computer scanners are a great time saver but nothing matches like the human eye!
Funny thing about those computer gizmos, they just pickout a close formula, not nessasarly the right one. I was matching the original Ford blue on my 40. I knew the computer wouldn't have 40's formulas so it gave me one for an 80's Fiat. Ugh! Embarrasing to have a Fiat color on my 40 but it is real damn close to the right color!