Notes on the Construction of a Colour Atlas

Problems occurring in the preparation of a colour atlas are discussed, and illustrated by considering a specific colour atlas in which the colours of paints, which consist of three pigments in a white base, are related to the concentrations of the pigments. Direct tables. giving colour as a function of concentrations, and inverse tables, giving concentrations as functions of colour, are considered and it is shown that both types of table may be constructed with a minimum of difficulty.