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Effect of local microroughness on the gloss uniformity of printed paper surfaces

机译：局部微观粗糙度对印刷纸表面光泽均匀度的影响

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摘要

A critical factor that affects the appearance of printed paper surfaces is gloss uniformity, which is usually assessed visually. To relate gloss uniformity to nonvisual quantities, we first visually identified areas of either high or low gloss on the same sample for two different types of paper. We then measured the roughness and the reflectance of these areas. Microroughness was measured with an atomic-force microscope, and roughness was measured over a larger area with a confocal laser scanning microscope. The local reflectance of the high-gloss and the low-gloss areas was obtained from images taken with a gloss-imaging instrument and compared with the roughness of each area. This correlation is nonlinear, and roughness is insufficient to predict the local reflectance. Light-scattering measurements were made in the specular direction to map the gloss uniformity over larger areas than was possible with the gloss-imaging instrument. These maps were used to show the possibility of using both the spatial frequency and the fan filters, which together form a set of cortex filters, to analyze the variation of the gloss about the mean value and its spatial distribution on the surface in terms of spatial frequency and azimuthal orientation.
机译：影响印刷纸表面外观的关键因素是光泽均匀性，通常通过肉眼评估。为了将光泽均匀性与非视觉量相关联，我们首先在视觉上确定了两种不同类型纸张在同一样品上的高光泽或低光泽区域。然后，我们测量了这些区域的粗糙度和反射率。用原子力显微镜测量显微粗糙度，用共聚焦激光扫描显微镜在较大面积上测量粗糙度。高光泽度区域和低光泽度区域的局部反射率是从使用光泽度成像仪拍摄的图像中获得的，并将其与每个区域的粗糙度进行比较。这种相关是非线性的，并且粗糙度不足以预测局部反射率。沿镜面方向进行光散射测量，以在比光泽成像仪可能的更大的区域上绘制光泽均匀性。这些图用于说明同时使用空间频率和扇形滤波器（它们共同构成一组皮质滤波器）来分析平均值上的光泽度变化及其在表面上的空间分布的可能性。频率和方位取向。

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