As far as the scanning method or "picture" method as it has been called, it sounds like someone didn't have the proper knowledge to give you a good match. When done properly, they will scan in several different areas of the same color and collect an average to get the code with. Even then some tinting might have to be done to get an accurate match. When done properly, this is the best method I know of to match older paint. DuPont makes some very good paint, if you stay in the chromasystem. Plus I would suggest using a little cooler clear, you have to be a little more carefull about the clear sagging, but the results are usually worth it- besides mild sags can usually be buffed out with no problem.