Toward an improved color rendering metric
Toward an improved color rendering metric
复制标题
改进显色指标
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Y. Ohno
中科院分区：
文献类型：
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作者：
Wendy Davis;Y. Ohno
显色指数 (CRI) 在多个方面存在缺陷，限制了其在评估普通照明 LED 显色能力方面的实用性。在 NIST，我们正在制定修改 CRI 的建议，以克服这些问题。当前的 CRI 仅基于八个反射样本，所有这些样本都是低到中等色饱和度。这些颜色不足以涵盖正常物体颜色的范围。一些能够准确渲染低饱和度颜色的灯光在高饱和度颜色上表现不佳。对于通过固态照明实现的具有峰值光谱分布的光源来说，这一点尤其突出。我们组装了 15 个孟塞尔样本来克服这些问题，并进行分析以显示改进。此外，与参考灯相比，CRI 对显示物体色饱和度增加的灯进行惩罚，这实际上是大多数应用所希望的。我们提出了一种新的计算方案来确定显色分数，该方案区分色调和饱和度变化并考虑它们的方向。 CRI 中使用的统一色彩空间已过时，建议更换。 CRI 将参考光的 CCT 与测试光的 CCT 相匹配。当灯光基本上偏蓝或偏红时，这可能会出现问题。极端 CCT 的灯通常是较差的显色性，尽管它们在当前的 CRI 上得分非常高。改进的色适应校正计算将消除匹配 CCT 的需要，并且正在考虑更新的校正。
Several aspects of the Color Rendering Index (CRI) are flawed, limiting its usefulness in assessing the color rendering capabilities of LEDs for general illumination. At NIST, we are developing recommendations to modify the CRI that would overcome these problems. The current CRI is based on only eight reflective samples, all of which are low to medium chromatic saturation. These colors do not adequately span the range of normal object colors. Some lights that are able to accurately render colors of low saturation perform poorly with highly saturated colors. This is particularly prominent with light sources with peaked spectral distributions as realized by solid-state lighting. We have assembled 15 Munsell samples that overcome these problems and have performed analysis to show the improvement. Additionally, the CRI penalizes lamps for showing increases in object chromatic saturation compared to reference lights, which is actually desirable for most applications. We suggest a new computation scheme for determining the color rendering score that differentiates between hue and saturation shifts and takes their directions into account. The uniform color space used in the CRI is outdated and a replacement will be recommended. The CRI matches the CCT of the reference to that of the test light. This can be problematic when lights are substantially bluish or reddish. Lights of extreme CCTs are frequently poor color renderers, though they can score very high on the current CRI. An improved chromatic adaptation correction calculation would eliminate the need to match CCT and an updated correction is being considered.