意味と目的
5.1 This practice should only be used to compare specimens of the same material and of the same general appearance. 例えば, a series of specimens to be compared should have roughly similar luster, テクスチャーと, 不透明でない場合, thickness and translucency.

5.2 黄色度測定用, this practice is limited to samples with a dominant wavelength in the 570 to 580nm range or a Munsell hue of approximately 2.5GY to 2.5Y. 白色度測定用, this practice is restricted to samples with Munsell values greater than 8.3 (CIEY より大きい 65) and Munsell chromaticity not greater than 0.5 (Bトーン) and Munsell chromaticity not greater than 0.5 (Yトーン 0.8) および他のすべてのトーン 0.3 (見る 3.3.1).

5.3 The combination of measurement and calculation leading to a yellow or white index is a psychophysical process, あれは, the specified procedure is designed to provide numbers relevant to the visual estimation performed under specific typical observation conditions. Since the visual observation conditions vary greatly, users should compare the calculated indices with the visual estimates to ensure applicability. Some of the standards that address visual estimation of color and chromatic dispersion are practices D1535, D1729, E1360 and E1541, and guide E1499.

5.4 This practice does not include preparation of specimens, a procedure that may have a significant impact on the number of measurements. 一般的に, specimens should be prepared and presented for measurement in a standard manner for the tests performed. Sufficient samples or sample areas were selected to provide average results representative of each sample to be tested. Please refer to Practice E1345.

器械色座標 ASTM を使用した黄色度指数と白色度指数の計算 313-2020

の範囲
1.1 This practice provides the number associated with the visual rating of yellow or white for white and near-white or colorless object color specimens, viewed in daylight by an observer with normal color vision. 白い布地, 塗料, and plastics are some of the materials that can be described by the yellow or whiteness index calculated by this practice.

1.2 For a complete analysis of object color by a designated observer and a designated light source, 3 つのパラメータを使用する必要があります. For near-white specimens, しかし, 黄色または白の特異なスケールを計算すると便利なことがよくあります。. This exercise provides recommended equations for this scale and discusses their derivation and use, as well as their applicability limits (see also reference (1) 2).

1.3 SI 単位で表された値は標準値として考慮される必要があります。. 他の測定単位はこの規格には含まれていません.

1.4 この規格は、すべての安全問題に対処することを目的としたものではありません, もしあれば, その使用に関連する. 適切な安全性を確立するのは、この規格の使用者の責任です。, 健康および環境慣行を確認し、使用前に規制制限の適用可能性を判断するため.

1.5 この国際規格は、国際規格開発の原則に関する決定で確立された国際的に認められた標準化原則に従って開発されました。, 世界貿易機関の貿易の技術的障壁に関する委員会が発行したガイドラインと勧告.