Proposal of an abridged color‐appearance model CIECAT94LAB and its field trials

Nayatani, Yoshinobu; Yano, Tadashi; Hashimoto, Kenjiro; Sobagaki, Hiroaki

doi:10.1002/(sici)1520-6378(199912)24:6<422::aid-col5>3.0.co;2-#

Cited by 15 publications

(2 citation statements)

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“…This figure clearly shows the differences between them for the red and green channels. To find out if the differences between sharper sensor and cone fundamental spaces is the answer to the question stated above, we performed further computations of color shifts using the CMCCAT97, CMCCAT2000, von Kries transform, CIECAT94LAB, and CIECAM02. As noted in the end of previous section, the first two chromatic adaptations are made in the sharper sensor space and they have spectral response curves roughly similar to the solid curves shown in Fig.…”

Section: Color Inconstancy Index and Color Shifts For The Three Samplesmentioning

confidence: 99%

“…are investigated. At the same time, the color shifts for the three gem samples are studied under various CATs including the CMCCAT97, the CMCCAT2000, the CAT02, the von Kries transform, the CIECAT94LAB, and the latest CIE‐recommended color appearance model CIECAM02 . The CMCCAT97 is a nonlinear transform and was used in the color appearance model CIECAM97s .…”

Section: Introductionmentioning

confidence: 99%

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A note about the abnormal hue angle change in CIELAB space

Melgosa

2012

Color Research & Application

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Liu et al. [Color Res Appl 1995;20:245–250] compared the CIELAB hue angles under CIE illuminants D65 and A for quantifying the color appearance changes for gem materials. They found that CIELAB hue angle for some gem materials under illuminant D65 was larger than under A, which is contrary to the perceived blue and purple appearances under daylight and incandescent light sources, respectively. They called this phenomenon as the abnormal hue angle change in the CIELAB space for the gem materials. In this article, we note the proper way to quantify the appearance changes is to use chromatic adaptation transforms (CATs), since we are only concerning the color change of the illumination. At the same time, it is found that the chromatic adaptations in the sharper sensor space and in the cone fundamental space provide different results, the ones related to the latter being in better agreement with current blue‐to‐purple color appearance change. © 2012 Wiley Periodicals, Inc. Col Res Appl, 38, 322–327, 2013

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Section: Color Inconstancy Index and Color Shifts For The Three Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%