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COLOUR DIFFERENCE FORMULA EVALUATION ON LCAM TEXTILE DATA

机译：LCAM纺织数据的色差公式评估

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Colour tolerances are either set in visual terms or, more and more, on basis of measured values. How should one go about setting tolerances, and what are meaningful colour tolerances? This subject is of considerable interest to manufacturers of coloured textiles as well as to their customers. This paper describes most of the factors that must be considered in setting such tolerances. The goal of colour difference formulas is to accurately and objectively define a colour difference so that it agrees with average visual assessments. Statistically, the variation coefficient of the CIELAB formula is approximately 30%. This means colour differences seen by the average observer as a 1 E unit will be calculated approximately from 0.4-1.6 units with a 95% confidence limit. Newer formulas are in better agreement with the average observer than the CIELAB. Today either CMC (2:1), BFD, or CIE2000 would be the better choice. Which one is better? They all are about equally good. The variation coefficient of these formulas is approximately 20% or about as good as a single observer's assessment. Their advantage is based on the fact that they adjust for a light grey viewing surround that the CIELAB does not. Currently work continues on improving colour difference formulae, but significant further improvements may not be possible. In this paper, based on the psychophysical method of paired comparison, an experiment for testing the visual colour difference in relation to colorimetric scales is presented to analyze the relationship between colour discrimination supra-threshold colour-difference perception and its use in textile industry. Primary are discussed actual colour-difference formulae DIN99, CIE2000 and MV-1.
机译：颜色公差以视觉方式设置，或者越来越多地根据测量值设置。如何设置公差，什么是有意义的颜色公差？彩色纺织品的制造商及其客户对这个主题非常感兴趣。本文介绍了设置此类公差时必须考虑的大多数因素。色差公式的目标是准确客观地定义色差，使其与平均视觉评估相一致。从统计上讲，CIELAB公式的变异系数约为30％。这意味着，平均观察者看到的1 E单位的色差将在0.4-1.6单位的范围内以95％的置信度限制进行计算。与CIELAB相比，较新的公式与一般观察者更一致。如今，CMC（2：1），BFD或CIE2000将是更好的选择。哪一个更好？他们都差不多。这些公式的变异系数约为20％，或与单个观察者的评估值差不多。它们的优势是基于这样的事实，即它们会针对CIELAB不会调整的浅灰色观察环境进行调整。当前，仍在继续改进色差配方，但是可能无法进行进一步的重大改进。本文基于成对比较的心理生理方法，提出了一种测试色度与色度相关的视觉色差的实验，以分析色差超阈值色差知觉与其在纺织工业中的应用之间的关系。首先讨论实际的色差公式DIN99，CIE2000和MV-1。

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