In part I of this work [Opt. Express , 27 ,9276, (2019) [CrossRef] ], we carried out an experiment to investigate the effects of adapting luminance and correlated color temperature (CCT) on degree of chromatic adaptation. Under the highest white luminance L_w of 900 cd/m², an incomplete chromatic adaptation was still found under the 2700 and 3500 K adapting conditions. This motivated us to further increase the adapting luminance to investigate whether a complete chromatic adaptation cannot happen under a low adapting CCT (e.g., 2700 K). In this experiment, we investigated the degrees of chromatic adaptation under 12 adapting conditions, comprising four CCT (i.e., 2700, 3200, 4000, and 6500 K) and three white luminance levels (i.e., L_w of 1200, 2100, and 3000 cd/m²), by asking human observers to adjust the color appearance of a stimulus to the whitest. Such luminance levels of the adapting conditions were never investigated in the past and are assumed to introduce a complete chromatic adaptation. The results clearly show that an incomplete chromatic adaptation still happened under the adapting condition having a CCT of 2700 or 3200 K, though the luminance was so high. The adapting luminance and CCT were found to jointly affect the degree of chromatic adaptation, with a higher degree of adaptation under a higher adapting CCT or luminance level. When the adapting CCT was low (i.e., 2700 or 3200 K), the increase of adapting luminance was found to be able to increase the degree of adaptation more effectively. These findings suggest the necessity to revise the chromatic adaptation transforms (CAT) and color appearance models (CAM) for better characterizing the color appearance of stimulus under different adapting conditions.

中文翻译：

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适应亮度和色温对白色外观和色适应度的影响，第二部分：极高的适应亮度

在这项工作的第一部分 [选项。Express , 27 ,9276, (2019) [CrossRef] ]，我们进行了一项实验，以研究适应亮度和相关色温 (CCT) 对色适应程度的影响。在900 cd/m ²的最高白光亮度L _w下，在2700和3500 K适应条件下仍然发现不完全的色适应。这促使我们进一步增加适应亮度，以研究在低适应 CCT（例如，2700 K）下是否不会发生完整的色适应。在本实验中，我们研究了 12 种适应条件下的色适应程度，包括四个 CCT（即 2700、3200、4000 和 6500 K）和三个白色亮度级别（即，L _w为 1200、2100 和 3000 cd/m ²)，通过要求人类观察者将刺激的颜色外观调整为最白。过去从未研究过这种适应条件的亮度水平，并假设引入了完整的色度适应。结果清楚地表明，尽管亮度如此之高，但在色温为 2700 或 3200 K 的适应条件下仍会发生不完全的色适应。发现适应亮度和 CCT 共同影响色适应的程度，在更高的适应 CCT 或亮度水平下具有更高的适应程度。当适应CCT较低时（即2700或3200K），发现增加适应亮度能够更有效地提高适应度。