It's a very difficult task to match a color sample (printed matter, paint, plastic)
using computer technology. Computer color simulations only approximate the real
color cards, fandecks or color collections.
In the real world, at the same time, those color cards only approximate the real
colors of the products (paint, ink, plastic...) they represent.
Computer generated colors are also deeply affected by the monitor characteristics,
environment, configuration and setup. Also the monitor (both CRT or LCD)
does not display all the colors we experience in real life.
For the above reasons computer and Web technology can NOT perfectly represent or substitute
original colors. On the other hand is possible to obtain useful information about
matching products. Is also possible to display very accurate
color differences on a computer screen.