Seeing means perceiving light from an external source which was scattered in a material medium and reemitted toward the observer’s eye. Thereby colors are the result of wavelength dependent absorption processes. The physical basis of color as molecular or atomic phenomenon is state-of-the-art in science, both in experimental and in theoretical respect. But to the authors knowledge, the deriving...

Mn and Cu-doped Cr2O3 nanoparticles were prepared by the co-precipitation method followed calcination at 400 0 C for 3h. These synthesized characterized Fourier Transform Infrared spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning electron microscope (SEM), Energy-dispersive spectroscopy, UV/Visible spectroscopy. SEM images showed irregular nearly spherical structure of Undoped doped respec...

Many works of art have undergone undesirable changes in color since initial creation. The use of spectral or colorimetric imaging, optical models such as Kubelka-Munk turbid-media theory, sample creation using colorants with similar optical behavior to the artist’s materials, and color-image processing has enabled the simulation of a work of art before the color change. This paper describes thi...

A technique was developed to qualify the masking power of undiluted opaque dental porcelain by dilution of opaque powder with a clear glaze powder and by extrapolation of quantitative data gathered by reflectance spectrophotometry. Quantification of reflectance data was made on dilute opaque porcelains using the scattering and absorption coefficients in the Kubelka-Munk equation. Qualitative co...

Due to its simplicity, the theory of KUBELKA-MUNK [1] has found a wide acceptance for modeling the optical properties of light scattering materials. However, the concept is not explicitly adapted to predict halftone prints on paper. In this respect, a recent improvement was given by BERG [2]. Our approach is an extension of BERG’s model in order to reduce the gap between the mathematical descri...

This paper is aimed to the determination of optical pseudogap values in phases with argyrodite structure by a simple method diffuse reflectance spectroscopy. Samples (Cu1-xAgx)7PSe6 (x = 0, 0.2, 0.3, 0.4, 0.6, 0.7, 0.9, 1.0) solid solutions were obtained form microcrystalline powders grinding agate mortar. The spectra samples studied spectral range 220–1400 nm (293 K) and analyzed using Kubelka...