Discrepancies often exist between visual assessment and instrumental assessment. These are due to different geometries with which samples are viewed or measured: In visual observation at the window or in the light booth, the sample panels are usually moved up and down. This changes the angle of illumination and observation. The current measuring devices have a fixed illumination.

中文翻译：

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干涉颜料的视觉和仪器评估

视觉评估和仪器评估之间经常存在差异。这是由于观察或测量样品的几何形状不同：在窗户或灯箱中进行目视观察时，样品板通常上下移动。这会改变照明和观察的角度。电流测量设备具有固定照明。