Printed colours look different from colours viewed on your monitor because they are produced in different ways. A monitor uses RGB (red, green, blue) colour model whereas printers use CMYK (cyan, magenta, yellow, black) colour model. Typically, CMYK can match around 85-90 per cent of colours in the RGB model. If a colour is selected from RGB model that is not within the range that CMYK model can match, the application will select the closest colour match instead. Some programmes, such as Adobe Photoshop, allow you to select the alternative colour but others may not.