<i>The Physics and Chemistry of Color: The Fifteen Causes of Color</i>

The polymeric precursor method was successfully used to synthesize Co x Zn 7Àx Sb 2 O 12 (x = 0-7) powders. Pigments were evaluated using colorimetry, X-ray diffraction, UV-vis and infrared spectroscopy. The optical band gap values vary with the Co 2+ substitution. These results suggest that the concomitant presence of Co and Zn in the spinel lattice leads to the rupture of the Végard law, as well as other properties of the studied system, such as unit cell volume. The Co-richer samples display a higher absorbance than the Co-lean samples. The high absorption of the Co 7 Sb 2 O 12 sample at most of the visible region makes this compound a candidate for a black pigment. It was shown that color depends on the site where the chromophore ion is located, in agreement with the ligand field theory. #

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“…5. This result indicates that this band is related to ZnO 4 and CoO 4 . These results are similar to ones of the II-III normal spinels [16].…”

Section: Resultsmentioning

confidence: 59%

“…The splitting arrangement is controlled by the symmetry; thus, the most commonly observed tetrahedral or octahedral environments produce different arrangements (Fig. 1) [4].…”

Section: Introductionmentioning

confidence: 99%

Color and structural analysis of CoxZn7−xSb2O12 pigments

Gouveia

Soledade

Paskocimas

et al. 2006

Materials Research Bulletin

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“…But such a case does not provide an example of something being two determinate shades simultaneously at a single location identified with the same degree of specificity. Nassau (1983) describes other cases (such as some transparent films) in which the color something will appear to have depends on the angle of viewing, but in which the same surface properties at a particular location are responsible for the variation. Due to interference effects in the reflected light, a location can reflect different wavelength light in different directions.…”

Section: Apparent Color Incompatibilitymentioning

confidence: 99%

Representationalism and the conceivability of inverted spectra

Thompson

2007

Synthese

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“…But because the two kinds of spectra have different physical origins and characteristics 36 (Fig. 2), it is possible that the effectiveness of the recovery might also differ.…”

Section: Spectral-reflectance Recoverymentioning

confidence: 99%

Recovering spectral data from natural scenes with an RGB digital camera and colored filters

Valero

Nieves

Nascimento

et al. 2007

Color Research & Application

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Many spectral-recovery methods using RGB digital cameras assume the underlying smoothness of illuminant and reflectance spectra, and apply low-dimensional linear models. The aim of the present work was to test whether a direct-mapping method could be used instead of a linear-models approach to recover spectral radiances and reflectances from natural scenes with an RGB digital camera and colored filters. In computer simulations, a conventional RGB digital camera with up to three colored filters was used to image scenes drawn from a hyperspectral image database. Three measures were used to evaluate recovery with the direct-mapping method: goodness-of-fit, root-mean-square error, and a color-difference metric. It was found that with two and three filters both spectral radiances and reflectances could be recovered sufficiently accurately for many practical applications. With little increase in computational complexity, an RGB camera and a few colored filters can provide significantly better recovery of natural scenes than an RGB camera alone.

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The Physics and Chemistry of Color: The Fifteen Causes of Color

Cited by 101 publications

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Color and structural analysis of CoxZn7−xSb2O12 pigments

Color and structural analysis of CoxZn7−xSb2O12 pigments

Representationalism and the conceivability of inverted spectra

Recovering spectral data from natural scenes with an RGB digital camera and colored filters

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