Metamerism In The Graphic Arts

If an original is processed to a printed image., and if a proof is made as an intermediate step, metameric color differences can occur between each of these three steps. To investigate the magnitude of metameric deviations, a computer program was written which calculates the delta E value between a color chosen as an original and its reproduction. It is shown that metameric differences between originals and printed images can exceed delta E values of 5, whereas metamerism between printed images and off-press proofs is often negligible. This refers to a change of the illuminant from D50 to D65.