There's a paint database thread here:

http://www.bikeforums.net/classic-vi...-database.html

I had heard a lot of paint shops will be able to match colors by scanning. That is true, however, when I took a frame into one of the larger automotive paint suppliers in my area, they told me the tubing did not present a large enough area to get an accurate scan.

There may be other places out there that have different equipment that can scan a frame tube and get a match. I haven't looked around so I don't know.