As do I. I wasn't suggesting you do this with every customer. But if they provide PMS colors, I will try and match as close as I can.Buy a PMS color card and match the color with the thread you have. You can go broke trying to please the picky customers. I carry 80 colors of thread, if a customer wants a color I don't stock, I charge them for the thread.
Sorry, I just re read your post.A customer gave me a logo to print along with a list of thread colors but I don't know how to translate thread color to a pms color. I could use a color picker but I don't know if the jpeg colors are accurate.