Abstract
This paper reports on the development of a measurement instrument to perform gloss measurements using an image-based detector. The image-based gloss meter was built according to the specifications of the optical layout of a specular gloss meter in a 60° measurement geometry, as described in ASTM D523-14. The photodiode detector was thereby substituted with a CMOS detector. The optical layout of the system was designed and validated by the use of ray tracing software. A series of 16 matte to high-gloss test samples, with nominal gloss values ranging between 3 and 90 gloss units, was used to compare specular gloss measurements obtained with the developed instrument and a commercial specular gloss meter. An average and maximum deviation of only 1.2 and 2.7 gloss units, respectively, was obtained, confirming the suitability of the system to perform standard specular gloss measurements. The potential benefits of the image-based approach were then studied. By way of example, the optical characterization of orange peel and contrast gloss by the use of the system was discussed, corroborating the fact that the proposed instrument offers important opportunities for a more global characterization of the total gloss impression.
Highlights
Gloss has been defined as one of the four main attributes of the appearance of an object, together with the surface color, texture, and translucency.[1]
Quality control of gloss is usually performed by the use of a specular gloss meter, which quantifies gloss from the degree of specular reflection from the surface, in comparison with the degree of specular reflection from a reference black glass standard as measured in the same particular measurement geometry.[2]
Besides the aspect of specular gloss, which might be linked to the amount of specular reflection, other visual attributes such as the distinctness-ofimage, haze, contrast gloss, and orange peel have been introduced as a result of the multidimensional nature of gloss perception.[5,6]
Summary
Gloss has been defined as one of the four main attributes of the appearance of an object, together with the surface color, texture, and translucency.[1]. Keywords Specular gloss meter, Image-based gloss measurement, Specular gloss, Contrast gloss, Orange peel
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