Consideration of Light Level in Specifying Light Source Color Rendition
Consideration of Light Level in Specifying Light Source Color Rendition
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DOI：
10.1080/15502724.2018.1448992
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发表时间：
2020-01
期刊：
影响因子：
3.6
通讯作者：
M. Wei;Wenyu Bao;Hsin-Pou Huang
中科院分区：
文献类型：
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作者：
M. Wei;Wenyu Bao;Hsin-Pou Huang
摘要在照明实践中，在确定光源的显色性时，很少考虑光照度。许多过去的研究发现，可以在一定范围内提高颜色饱和度的光源，特别是对于红色，是优选的，但是实验通常在200和500 lx之间的照度下进行，并且照度在个体研究中很少变化。本文报道了一项心理物理学研究，旨在测试照明是否影响颜色偏好。产生四个近似同色异谱的刺激，其相关色温（CCT）约为3000 K，Duv为-0.005，以两个照度水平（即20和500 lx）照亮油画。这四个刺激被仔细设计以覆盖从100到125的相对色域（即IES Rg）的范围，并增强红色和绿色颜色的饱和度（即Rcs，h1和Rcs，h8）。观察者在相同的照度水平下以顺序模式比较成对的光刺激，并选择他或她喜欢的绘画颜色外观。结果发现，最优选的刺激的Rg随着照度的增加而减小。在20 lx下，Rg ≥ 117的刺激最受欢迎，而在500 lx下，Rg ≥ 100的刺激最受欢迎。由具有较大色域面积的刺激引起的照度和饱和度增强之间的相互作用揭示了在指定光源显色性时考虑照度的重要性，特别是当应用需要低光照水平和良好的显色性时。
ABSTRACT In lighting practice, light level is seldom considered when specifying light source color rendition. Many past studies found that sources that can enhance color saturation within a certain range, especially for red colors, were preferred, but the experiments were typically carried out with an illuminance between 200 and 500 lx and the illuminance was seldom varied in individual studies. This article reports a psychophysical study that was designed to test whether illuminance affected color preference. Four nearly metameric stimuli with a correlated color temperature (CCT) around 3000 K and a Duv of −0.005 were produced to illuminate an oil painting at two illuminance levels (that is, 20 and 500 lx). These four stimuli were carefully designed to cover a range of relative gamut (that is, IES Rg) from 100 to 125 and enhance the saturation of red and green colors (that is, Rcs,h1 and Rcs,h8). Observers compared pairs of light stimuli at a same illuminance level in a sequential mode and selected the one under which he or she preferred the color appearance of the painting. It was found that the Rg of the most preferred stimulus decreased as the illuminance increased. The stimulus with an Rg ≈ 117 was the most preferred at 20 lx, whereas the one with an Rg ≈ 100 was the most preferred at 500 lx. The interaction between illuminance and saturation enhancement caused by the stimuli with larger gamut areas revealed the importance of considering illuminance when specifying light source color rendition, especially when an application requires a low light level and good color rendition.