5 April 2012

luminous yellow

High-speed printing processes, such as offset lithography and rotogravure, reproduce full colour graphics from a set of four "process" colours: cyan, magenta, yellow and key (black), collectively abbreviated as CMYK. All of the colour groups can be reproduced from CMY and K is added for improved contrast and deeper blacks.  

Special colours, such as a very specific shade, metallic or fluorescent (see also fluorescent and reflective), that cannot be achieved with a mix of CMYK, are reproduced using spot colour.