One of the issues in Web page design is the selection of appropriate combinations of background and foreground colors to display textual information. Colors have to be selected in order to guarantee legibility for different devices, viewing conditions and, more important, for all the users, including those with deficient color vision. In this paper we present a tool to select background and for...

The perception and understanding of the three color attributes have been analyzed from two experiments using pairs of Munsell samples, where only one of the three color attributes were changed/unchanged (Experiment I/II) at a time. In each experiment, 36 pairs with color differences of 3 different sizes (average values of 15.8 and 21.7 CIELAB units for Experiments I and II, respectively) were a...

EdwardR. Landa is a research hydmlogisi with the U.S. Geological Siin'ey in ResUm. Virginia. He received his B.S. in geolog\from Ihe CityCollege ofNew Yorkandhis M.S. andPh.D. in soil science ft-om the University of Minnesota. His research focuses on the behavior ofrnelals and radiomiclides in soils and aquatic envimnments. Mark D. Fairchild is the Xenix Pmfessor of Color Science and director o...

Two psychophysical experiments were conducted to analyze the role of color attributes in simple tasks involving color matching and discrimination. In Experiment I observers made color matches using three different adjustment control methods. The results showed that the Lightness, Chroma, Hue (LCH) and the Lightness, redness/greenness, blueness/yellowness ({L, r/g, y/b}) adjustment controls elic...

Este artículo narra la importancia del color como “rasgo identitario” y componente fundamental en comunicación visual, considerando que identidad de algunas culturas tiene sus raíces los colores han distinguido su arte a través historia. Los esfuerzos ser humano por organizar el vasto conjunto distinguimos nacen desde Aristóteles continúan hasta actualidad con catálogos Munsell Pantone. Sin emb...

The Fechner-Benham color phenomenon is a percep tual effect in which color is generated by intermittent presentations of patterned white light. The most common method for producing the colors involves rotating a black and white patterned disc at speeds well below fusion. This method was first introduced by Fechner (1838), and since then, a multitude of disc designs have appeared in the literatu...

The N basis functions are typically chosen so that Surface reflectance functions(SRFs) and spectral power distributions (SPDs) can be accurately reconstructed from their N-dimensional vector codes. Typical rendering applications assume that the resulting mapping is an isomorphism where vector operations of addition, scalar multiplication, component-wise multiplication on the N-vectors can be us...

Many aspects of visual coding have been successfully predicted by starting from the statistics of natural scenes and then asking how the stimulus could be efficiently represented. We started from the representation of color characterized by uniform color spaces, and then asked what type of color environment they implied. These spaces are designed to represent equal perceptual differences in col...

The evolution of population color categorization systems formed on the Farnsworth-Munsell 100 Hue Test continuum is investigated in populations of artificial agents using realistic constraints from human populations: namely, (i) varying amounts of normal observer heterogeneity, and (ii) varying degrees and forms of observer color deficiency. These constraints are made operational in agent categ...

In everyday experience, perceived colors of objects remain approximately constant under changes in illumination. This constancy is helpful for identifying objects across viewing conditions. Studies on color constancy often employ monitor simulations of illumination and reflectance changes. Real scenes, however, have features that might be important for color constancy but that are in general no...