Color change due to surface state modification

Effect of surface topography on color and gloss of chocolate samples

“…The relationship between color and surface topography of an object is of current interest in many industries. When the surface of a smooth-colored object becomes rough, the apparent color of the object changes (Simonot & Elias, 2002). Moreover, dark or high-chroma objects are particularly affected by changes in gloss, whereas high-lightness objects are not.…”

Color change due to a varnish layer

“…These phenomena have been compared to the color change induced by the modification of the surface roughness previously studied in the same way. 3 For more precise measurements, exact computations have been implemented and the initial and final colorimetric coordinates have been related. The results depend on the refractive index of the paint, n p , compared to that of the varnish, n. The hue is almost never affected by such changes.…”

“…It is interesting to compare these results with those obtained for a modification of the surface state as studied previously. 3 The presence of a varnish induces a vertical downward homothety of the reflectance spectra, whereas an increase of the surface roughness induces a vertical upward translation. In both cases, the hue is only slightly affected by these modifications, the chroma decreases, and, of course, the color change increases.…”

“…We carry out the same method used previously to study the color change due to a modification of surface roughness. 3 First, the bidirectional relationship between the reflectance factors of the background with and without the varnish layer, previously obtained, 4 is briefly recalled. Second, attention is focused on problems arising from the varnish-painting interface due to the difference of their refractive indexes.…”

Experimental study of back‐scattering spectrum of textile structures

“…1 The facts that these measurements are nondestructive, without contact, and can be realized in situ make this method very adaptable to the study, the restoration, and the knowledge of the artistic techniques of the works of art that make up our cultural heritage. 2 The same technique was used by Simonot and Elias 3 to study the relation between the colour and surface topography of objects. They showed that the modification of the surface roughness involves a vertical adjustment of the reflectance spectrum in the form where R i is the initial spectrum (of plane surface) and A 0 is the translation of the spectrum produced by this roughness.…”