Instrumental color measurements of automotive samples with convex cylindrical curvatures under diffuse lighting

1. M. Melgosa ²
2. F. J. Rodríguez-Pulido ¹³
3. L. Gómez-Robledo ¹²
4. M. Tejada-Casado ²
5. R. Bermejo ¹⁴
6. M. A. Murillo ⁵
7. F. J. Heredia ¹³

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DOI: 10.7149/OPA.57.1.51166 DIALNET GOOGLE SCHOLAR lock_openAccés obert editor

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Resum

Although car bodies often have curved surfaces sprayed with solid or effect colors, instrumental color measurements of these surfaces are usually carried out on flat samples with multi-angle spectrophotometers. We used a DigiEye® instrument, equipped with diffuse lighting, to measure color in different areas on the surface of 22 car body samples (105 mm wide x 148 mm high), 10 with solid colors and 12 with effect colors. Each measured sample had 5 convex cylindrical curvatures with radii ranging from 50.4 mm to infinity (flat sample). On the average, color variations are 3-4 times greater in the effect samples than in the solid samples, as deduced from measurements in 27 mm x 36 mm rectangles and circular areas of 8 mm in diameter 32 mm apart. For solid color pairs, the color differences between analogous regions of 8 mm diameter were very similar (standard deviations below 0.2 CIELAB units). For samples pairs with solid colors there was a high linear correlation (r>0.95) between the color differences measured with DigiEye® at 8 mm diameter analogous regions and BYK-mac measurements with 45°/110° geometry, but for color pairs with effect colors the linear correlation between measurements with these two instruments was always very low (r<0.5).

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