Relaxed color reproduction under different illuminant conditions

Abstract

In many applications, the illuminant condition of color reproductions is different from that of targets. To achieve the same color perceptions, reproduced colors should be adjusted according to the changes of reference whites determined by the illuminants. In this paper, we consider this color reproduction problem which is also subject to material constraints. By material constraints we mean any constraints that are applied to the amount of inks, lights, voltages, and currents that are used in the generation of color. Color reproduction that is subject to material constraints is called the relaxed color reproduction, because the reproduced colors may not match the targets exactly. An algorithm that is suitable for this task is the method of vector space projections (VSP). In our work, VSP method is directly applied to the control signals of devices. The effects of illuminant variances are also studied. In order to use VSP for constrained color reproduction, we use a novel approach to convert the non-linear constraints in the CIE-Lab space into simpler linear forms. Experimental results demonstrate the feasibility of this method.