Determination of the relationship between transmission and reflection densities solely from measured values of reflection density - a useful method for the prediction of reproduced colour of reflection-type prints

The relationship between transmission and reflection densities is essential to the research and design of colour reproduction systems, but, historical ly, this relationship has been so difficult to determine in actual systems that researchers have been forced to turn to methods that sacrifice accurac y for practicality. In response, a method has been developed by which this relationship, in practical colour reproduction systems, can be obtained sol ely from reflection density values. In this method, differences in reflecti on density resulting from small additions of dye are measured, the incremen ts in reflection density are numerically integrated and, from this, the rel ationship between transmission and reflection densities is obtained. When a pplied to actual systems, this method provides results that are virtually i dentical to directly measured values.