The online colors are pretty useless. Colors like the Lombard blue show up black which is kind of what it would look in the shade, but in the full sun it has a dark blue color.
If you are using the paint handbook that is produced by the clubs you must surround the color with a neutral color. The white surrounds trick you eyes into believing it is dark. I had this problem at first. Once I put the neutral color around the Lombard blue it was a perfect match to the original paint that was left on one of my doors.