Application of Color Appearance Model to Color Image Evaluation

摘要

We studied the relationship between color image evaluation and color appearance using the color appearance model. To evaluate the color image of four types of stimuli: red, yellow, green and blue, we designed experiments using three types of fluorescent lamps: EX-D, EX-N, and EX-L as light sources. We adjusted the illuminance level at 350 and 700 Ix. Studying the relationship between the experimental result and psychometric values predicted by the model, we confirmed the effectiveness of the model to evaluate the color image and obtained the following conclusions. (1) A change of the warm cold impression of the stimulus when the correlated color temperature of an illuminant changed originates from a change of the apparent chromaticity on the chroma plane. (2) A change of the brightness impression of the stimulus when the illuminance condition changed originates from a change of the equivalent lightness of the color appearance of it. (3) A change of the effect of the color image when the illuminance condition changed originates from a change of the colorfulness and the equivalent lightness of the color appearance of the stimulus. (4) A difference of the color image evaluation between different color stimuli correlates to a difference of the hue angles of the stimuli.