Computers use RGB (red, green and blue) light to display colours on the screen, while printers use CMYK (cyan, magenta, yellow and black) ink to print colours. Because of this, colours appear slightly different on paper than on the computer.
What you see on the computer cannot always be reproduced perfectly on a printed product. If an exact colour match is essential to your project, a physical sample will be required, or a PMS colour. The colours on the computer appear different because the monitor emits light, while the printed product reflects light. Understanding this difference will help improve the outcome of your project.
