A proposal for the modification of s-CIELAB

— The s-CIELAB is a powerful tool in evaluating color reproduction errors in images. However, the formula is not yet completed, and a few refinements to the formula will enhance the accuracy of this tool. From a simple simulation, a black-and-white pattern causes unexpected false color components when using the s-CIELAB formula. We show how these false color components are obtained with this formula. The main reason is a combination of components from different lowpass filters (LPFs). We show a method that improves this situation by introducing new psychological values and propose a modification to the formula employed by s-CIELAB. The new formula is compatible with the psychological values L*u*v*, and a simulation with general images shows that the new method does not cause any false color components.