The vast majority of colour magazines,
brochures and leaflets are printed on Lithographic printing presses using the CMYK 4-colour process. The initial set-up costs are higher than digital printing machines but because they run
at much higher speeds they're more economic for larger quantities.
'4-colour' printing presses use the CMYK colour model. By using
cyan, magenta, yellow and black inks, you can mix nearly any colour.
When preparing a colour image for printing, the operator makes
four printing plates. Each plate is for one of the four colours of ink in the
CMYK model. When all four plates are aligned and printed on top of each
other, the inks will combine to simulate the proper colours. This method is
referred to as 'process colour' (or '4-colour') printing.