의미와 용도
5.1 This practice should only be used to compare samples of the same material and the same general appearance. 예를 들어, a range of specimens to be compared should have roughly similar lustre, texture and (if not opaque) thickness and semi-transparency.
5.2 For yellowness measurements, this practice is limited to samples whose main wavelength is in the range 570 to 580nm or whose Munsell hue is approximately 2.5GY to 2.5Y. For whiteness measurements, this practice is limited to samples with Munsell values greater than 8.3 (CIEY greater than 65) and Munsell chromaticity no greater than 0.5 (B tone) and Munsell chromaticity no greater than 0.5 (Y tone 0.8) and all other tones of 0.3 (보다 3.3.1).
5.3 The combination of measurement and calculation that results in a yellow or white index is a psychophysical process, 그건, the specified procedure is designed to provide numbers relevant to visual estimates made under specific typical observation conditions. Since visual observation conditions vary widely, users should compare the calculated index with visual estimates to ensure applicability. Some standards that address color and chromatic aberration vision estimation are Practices D1535, D1729, E1360, and E1541, as well as guidelines E1499.
5.4 This practice does not include specimen preparation, a procedure that can have a significant impact on the amount measured. Typically, samples should be prepared and presented for measurement in a standard manner for the tests performed. Select enough samples or sample areas to provide average results representative of each sample under test. See Practice E1345.
Calculation of Yellowness Index and Whiteness Index Using Instrumental Color Coordinates
범위
1.1 This practice provides numbers associated with visual ratings of yellow or white for color specimens of white and near-white or colorless objects, viewed in daylight by observers with normal color vision. White textiles, paints and plastics are some of the materials that can be described by the yellow or whiteness index calculated in this way.
1.2 In order to perform a complete analysis of object color by a specified observer and a specified light source, three parameters need to be used. 하지만, for near-white specimens, it is often useful to calculate a singular scale of yellowness or whiteness. This practice provides recommended equations for this scale and discusses their derivation and use, as well as the limits of their applicability (see also References (1) 2).
1.3 SI 단위로 표현된 값은 표준값으로 취급됩니다.. 이 표준에는 다른 측정 단위가 포함되어 있지 않습니다..
Calculation of Yellowness Index and Whiteness Index Using Instrumental Color Coordinates
1.4 This standard is not intended to address all, 만약에 어떠한, safety concerns associated with its use. 적절한 안전을 확립하는 것은 이 표준 사용자의 책임입니다., 건강 및 환경 관행을 확인하고 사용 전 규제 제한의 적용 여부를 결정합니다..
1.5 This international standard is based on the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, WTO 무역기술장벽위원회가 발행한 지침 및 권고사항.