This chapter provides an overview of how computer network systems can be used to quantify, analyse and share information about colour. A comprehensive case study of the use of virtual products in colour communication is presented and some commercially available software products in this field are identified and assessed. The relevant computer models for the creative, commercial and technical aspects of colour communication are discussed in depth and existing standardised models such as the CIE system are reviewed. Sufficient detailed guidance is given to enable the development of appropriate models for describing and visualising colour, and for calibrating the colour reproduction characteristics of computer systems.