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
  1. 1 Sociedad Española de Óptica
  2. 2 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  3. 3 Universidad de Sevilla
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    Universidad de Sevilla

    Sevilla, España

    ROR https://ror.org/03yxnpp24

  4. 4 Universidad de Jaén
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    Universidad de Jaén

    Jaén, España

    ROR https://ror.org/0122p5f64

  5. 5 Instituto Tecnológico de Costa Rica
    info

    Instituto Tecnológico de Costa Rica

    Cartago, Costa Rica

    ROR https://ror.org/04zhrfn38

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Revista:
Óptica pura y aplicada

ISSN: 2171-8814

Año de publicación: 2024

Volumen: 57

Número: 1

Tipo: Artículo

DOI: 10.7149/OPA.57.1.51166 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Óptica pura y aplicada

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Resumen

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).

Fuente de los datos: Dialnet