Abstract

Color printing tolerances in ISO 12647-2 have been specified by TVI and midtone spread. ISO TC130 is contemplating to replace midtone spread by chromaticness difference (ΔCh). In order to find the equivalence between midtone spread and ΔCh, this research uses a simulation to generate a large database with print jobs that are in conformity to midtone spread requirements as well as print jobs that are not. The results show that the tolerance of 5 midtone spread for a quarter-tone (25C19M19Y) triplet is 1.8 ΔCh. The tolerance of 5 midtone spread for a midtone (50C40M40Y) triplet or three-quarter (75C66M66Y) triplet is 3.2 ΔCh. The finding provides insights into the determination of ΔCh tolerance that aligns with the existing midtone spread tolerance of 5.