A generalized color-difference space was introduced based on theories of multi-stage color vision, for example, the zone theory, and extended by integrating line elements. This space had the following features: chromatic adaptation, a linear transformation from CIE tristimulus values to cone fundamentals, a nonlinear compression stage, a second linear transformation to opponent signals, and lin...

Light scattering, or the so-called Yule-Nielsen effect, and ink penetration into the substrate paper play important roles in tone reproduction. We develop a framework in which the influences of both of these effects on the reflectance and tristimulus values of a halftone sample are investigated. The properties of the paper and the ink and their bilateral interaction can be parameterized by the ...

Tristimulus colorimetry using a digital still camera (DSC) as a colorimeter has been developed. A photograph of a sample and standard solutions was taken simultaneously with the DSC, and it was transferred to a PC. On the PC, the colors of the sample and of the standard solutions were analyzed and L* (brightness), a* (red-green component), and b* (yellow-blue component) values were determined w...

In the last few years multispectral imaging has entered the field of painting diagnostics and conservation because of its effectiveness and safety. It provides spectral and colorimetric characterization of the whole paint layer, suitable to document the conservation state of the artwork and useful in the study for the identification of pigments. Here we present a high-resolution scanning system...

Volume absorption is a crucial factor to the appearance of transparent objects such as colored glass and liquids. Due to the involvement of the spectral absorptivities of materials and path lengths of lights, volume absorption can generate interesting color variations. In this paper, we model volume absorption for homogeneous transparent materials using Bouguer-Lambertian law, and render its ph...

Investigations were carried out for available digital image B,G,R data aiming at the derivation of a colour difference measure for the same scene areas imaged in several overlapping images of a photogrammetric bloc. The images were transformed first into the CIE XYZ tristimulus colour space and then into the approximately uniform CIE L*a*b* colour space using both, the known relative spectral s...

Corresponding colors data for complex images were obtained using an adjustment method. Experiments were carried out for printed images viewed at a high luminance in a light surround under CIE illuminant D50 simulators that were matched by CRT-displayed images using both CIE illuminant D65 and D50 white points at a lower luminance level in a dark surround. The results show expected chromatic ada...

2. PROPOSED ADAPTATION MODEL Abstract When we watch television or computer monitor under a certain viewing condition, we partially adapt to the display and partially to the ambient light. As illumination level and chromaticity changes, the eye’s white point changes between the display’s white point and the ambient light’s white point. In this paper, we propose a model that would predict the whi...

The phenolic composition (by HPLC-DAD-MS) and color characteristics (by Imaging Tristimulus Colorimetry) of four strawberry cultivars that have shown good climate adaptation to subtropical area (Nikte, Zamorana, Jacona and Pakal) have been assessed. 24 monomeric phenolics were identified, including 15 anthocyanins, 5 phenolic acids, 1 flavanol and 4 flavonols. Nikte and Zamorana showed the high...