The colour separation process is a printing technique that divides a full-colour image into four separate layers: cyan, magenta, yellow, and black (CMYK). Individual films are produced for each colour, which are then used to create printing plates for the press. This method ensures accurate reproduction of colours, tonal ranges, and detail in printed materials. Widely used in commercial printing, publishing, and photographic reproduction, the colour separation process is essential for producing high-quality colour prints with precise colour registration and consistency across large print runs.