Prediction of experimental results on additivity-law failure

✍ Scribed by Yoshinobu Nayatani; Hiroaki Sobagaki

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 161 KB
• Volume: 25
• Category: Article
• ISSN: 0361-2317
• DOI: 10.1002/(sici)1520-6378(200002)25:1<32::aid-col5>3.0.co;2-w

✦ Synopsis

Experimental results on additivity-law failure observed by direct brightness matching are estimated for various combinations of two spectrum colors. The estimations are made by using the prediction equation of the Brightness/Luminance (B/L) ratio effect on chromatic colors, which is based upon the Variable Chromatic Color (VCC) method for the effect. The predicted results confirm the existence of the two types of additivity-law failures called enhancement or cancellation, already reported by several researchers. The prediction equation also clarifies that the effect of additivity-law failure does not change for a wide change of adapting luminance used in observation. Both B/L effect and additivity-law failure can be estimated quite nicely by the same prediction equation without making any modification to it. The Helmholtz-Kohlrausch effect can imply both effects in its wide definition.