OBJECTIVE The aim of the present investigation is to identify tooth shade among a group of Sudanese patients. MATERIALS AND METHODS Total number of patients was 227. Participant's age ranged from 15 to 72 years, which, was divided into four groups. The tooth included in the study was either right or left sounds maxillary central incisor. Vita Easyshade was used to select the tooth shade. Inve...

In the ceramic industry half-tone images are often generated from a small number of separations with the result that inks are printed over each other to achieve the final print. This study investigates whether an n-modified spectral Neugebauer-based model, which has been used quite successfully to predict reflectance for prints on paper substrates, can be used to predict the color of half-tone ...

Traditional methods of image permanence testing have tracked changes in image appearance (changes in density, color balance, and/or Dmin stain) with densitometric endpoint criteria. Densitometric filter sets were optimized for specific colorant systems, for example, the Status A filter set to measure chromogenic photographic materials like those processed in RA-4 chemistry. Modern digital print...

We developed a quantitative evaluation method for luminance and color uniformity on a display screen. In this paper, we report the analysis result of a viewer perception of luminance and color uniformity. In experiments, observers subjectively evaluated Mura images which were showed on the light emitting diode (LED) backlight screen by adjusting the luminance of each LED. We measured the lumina...

BACKGROUND Non-Newtonian fluids occur in many relevant flow and mixing scenarios at the lab and industrial scale. The addition of acid or basic solutions to a non-Newtonian fluid is not an infrequent operation, particularly in Biotechnology applications where the pH of Non-Newtonian culture broths is usually regulated using this strategy. METHODOLOGY AND FINDINGS We conducted mixing experimen...

We conducted a monitor-based subjective study on multilevel halftone. Observers in a halftone preference experiment selected stimuli in a paired comparison design. Images were halftoned using multilevel stochastic screening and multilevel error diffusion. Stimuli were presented on a calibrated monitor from distances equivalent to viewing 300 and 600 dpi prints. We applied Thurstone's law of com...

We focus on a recently proposed regression framework termed lattice regression, as applied to the construction of multidimensional color management look-up tables from empirical measurements. The key idea of lattice regression is that the construction of a look-up table should take into account the interpolation function used in its final implementation. Lattice regression solves for the look-u...

Compared with the planar color gamut, stereoscopic gamut is more uniform, it can reflect actual situation of display system by considering changes in brightness. In this article we introduce another advantage using external factors system, such as influence spectral reflectivity screen. When space converted from CIEXYZ to CIELAB, use a fixed white point, these results are intuitive and reasonab...

Passerina del Frusinate is an autochthonous wine grape variety, which grows in the Lazio region that is currently being evaluated by local wine producers. In this study, colour properties (CIELab coordinates), bioactive compounds (total polyphenols and flavan-3-ols), HPLC-DAD phenolic acid profiles and in vitro biological activity of monovarietal Passerina del Frusinate white wines and the effe...