Brightness, lightness, colorfulness, and chroma in CIECAM02 and CAM16. Issue 5 (25th March 2022)

• Record Type: Journal Article
• Authors: Hellwig, Luke; Fairchild, Mark D.
• Is Part Of: Color research & application. Volume 47:Issue 5(2022)
• Page Start: 1083
• Page End: 1095
• Publication Date: 2022-03-25
• Subjects: brightness -- CAM16 -- color appearance model; Color -- Periodicals; 535
• DOI: 10.1002/col.22792
• Languages: English
• ISSNs: 0361-2317

Abstract

Abstract: In the CIECAM02 and CAM16 color appearance models, brightness is computed as a nonlinear function of lightness. This paper traces the history of that nonlinearity to its roots in the Hunt color appearance model. A new, more robust, linear relationship between lightness and brightness is proposed. This new formula also prompts the reevaluation of the CAM16 equations for chroma, colorfulness, and saturation. The new formulas for these perceptual attributes are tested on experimental data from the Munsell color order system and the LUTCHI color appearance dataset and are compared to the performance of the original CAM16 equations. Abstract :