Ganz-Griesser 白度指数是一个线性公式,广泛应用于纺织行业。它源于 CIE 三刺激值,定义为 [latex]W_{GG} = Y - Px - Qy + C[/latex],其中 P、Q 和 C 是光源和观察者的特定常数。对于 D65/10° 条件,公式为 [latex]W_{GG} = Y - 1868.322x - 3695.690y + 1809.441[/latex]。.

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Ganz-Griesser 白度指数是一个线性公式,广泛应用于纺织行业。它源于 CIE 三刺激值,定义为 [latex]W_{GG} = Y - Px - Qy + C[/latex],其中 P、Q 和 C 是光源和观察者的特定常数。对于 D65/10° 条件,公式为 [latex]W_{GG} = Y - 1868.322x - 3695.690y + 1809.441[/latex]。.
The Ganz-Griesser whiteness index is an alternative to the CIE whiteness formula, favored in some industrial applications for its simplicity and historical precedent. It is a linear equation that directly relates the tristimulus values (or chromaticity coordinates x, y, and lightness Y) to a single whiteness value. The general form is [latex]W_{GG} = Y – Px – Qy + C[/latex]. The constants P, Q, and C are derived based on a specific illuminant and standard observer. For the widely used D65 illuminant and 10° observer, these constants are P=1868.322, Q=3695.690, and C=1809.441. Unlike the CIE formula, which has defined validity ranges, the Ganz-Griesser formula is a purely linear transformation. This can sometimes lead to different results, especially for samples with strong fluorescent whitening agents or significant chromatic tints. The formula essentially penalizes deviations from a target white point in the xy chromaticity diagram while rewarding higher lightness (Y). Its development was driven by the need for a practical, easy-to-calculate index for industrial quality control before computational power was as ubiquitous as it is today. Despite the official recommendation of the CIE formula, the Ganz-Griesser index remains in use due to established industry standards and historical data sets.
Ganz-Griesser 白人指数
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