Examination of adaptation coefficients for incomplete chromatic adaptation

✍ Scribed by Yoshinobu Nayatani

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 105 KB
• Volume: 22
• Category: Article
• ISSN: 0361-2317
• DOI: 10.1002/(sici)1520-6378(199706)22:3<156::aid-col4>3.0.co;2-q

✦ Synopsis

The chromatic-adaptation transform in the the present study is to clarify the problem latent in the Hunt's coefficients and to propose a correcting formula to the chro-RLAB model by Fairchild et al. was examined. In the transform, the chromatic-adaptation coefficients by Hunt matic-adaptation transform using them.

Hunt introduced an empirical formula F r , F g , F b for are used for taking account of the effect of incomplete chromatic adaptation to a test chromatic illuminant. The estimating the state of incomplete adaptation to his colorappearance model. 3 The functions F r , F g , F b are called adapting chromaticities of the coefficients were estimated for illuminants A and D65 at several luminance levels.

the chromatic-adaptation coefficients, which are determined by the chromaticity of adapting illuminant and the Further, a theoretical study clarified the existence of a systematic deviation in the predicted results of corre-adapting luminance of the experiment under study. Fairchild 4 gave a chromatic-adaptation transform in 1991 sponding colors by the transform using the Hunt's coefficients. The reason of the deviation was explained, and by combining the von Kries law 6 and the chromatic-adaptation coefficients by Hunt. The transform was applied only its correction method was proposed.