Ответ: Relative-измерения на i1 -- БЬЮ ТРЕВОГУ!
vade сказал(а):
Получается, что за стандарт мы можем взять материал с любым СКО. Может быть не такой белый, но более светостойкий, так?
Да. Кстати, бариевая метка далеко не белая, а желтая, только очень светлая. Но чем светлее материал, тем лучше -- точнее рассчет.
vade сказал(а):
Поставьте галочку spectral в Measure Tool - зафиксируются.
Зафиксируется не СКО, а нормированное SPD, рассчитанное на данный осветитель (D50). Нормировка делается для удобства рассчетов, поэтому создается иллюзия, будто цифири спектрального референса -- это СКО. Если бы фиксировалось СКО, в референсе не указывался бы источник (D50).
Вот, кстати, данные из Хелпа к Measure Tools:
Spectrophotometers operate on the premise that each color can be described as an additive mix of spectral colors. The visible spectrum to be measured is split into small intervals, and the light intensities are measured separately in each wavelength interval. Most commonly used spectrophotometers operate with 10 nm intervals, so that roughly 30 individual light intensities are calculated across the visible spectrum. In technically more sophisticated systems, much smaller intervals (down to 1 nm) can be measured, but the common 10nm intervals in lower-priced devices are sufficient for measuring object colors in day-to-day practice.
Subsequent processing of the
spectral intensity data (курсив мой) is generally followed by a mathematical simulation of the three receptors of the CIE standard colorimetric observer under a specified illuminant and at a defined observation angle. This way, for instance the 30-channel signal can be reduced to the defined quantities CIEXYZ for colorimetric evaluation and can be converted subsequently for use in other color systems. The software of a spectral color measurement device typically allows direct conversion of the spectral data to the color systems commonly used today, taking into account the equations of the respective standardization groups (e.g. of the CIE).
When reducing the spectral data to CIE color systems, the illuminant, among other parameters, is considered directly as a parameter. As a consequence, subsequent conversions for different light conditions (e.g. from D50 to D65 or vice versa) are no longer possible, or at least only possible with the aid of mathematical methods of approximation.
CIE coordinates for different illuminants and observation angles can be calculated from the spectral measurement data of a spectrophotometer.
In addition, certain, color effects, which are to some degree disruptive (e.g. metamerism, fluorescence) or insufficiencies of the optical measuring system can frequently be detected with the aid of the spectral measurement data, and eliminated with corresponding compensation calculations.
