background: adverse effect of sun rays mainly uv ray on the human eye documented and protection of eyes is necessary using different methods such as, sun glasses. sunglasses are designed in different colors. the aim of this study was evaluation of the effect of different colors of sunglasses on the visual acuity, contrast sensitivity, stereopsis and color vision. methods: 81 normal subjects wer...

Fix positive integers k′, d′, k, d such that k′/d′ > k/d ≥ 2. If P is a set of vertices in a (k, d)-colorable graph G, and any two vertices of P are separated by distance at least 2 ⌈ kk′ 2(k′d−kd′) ⌉ , then every coloring of P with colors in Zk′ extends to a (k′, d′)coloring of G. If k′d − kd′ = 1 and $k′/d′% = $k/d%, then this distance threshold is nearly sharp. The proof of this includes sho...

We know most about the sense of Sight, with milestones like Berlin & Kay (1969) and Kay et al. (2006). Languages differ in quite systematic ways in their expression of color terms that can be related to basic mechanisms of color perception and the further neural processing of visual stimuli. We can distinguish between a pair of terms denoting intensity (light and dark), and terms denoting indiv...

Diffusion curves are a powerful vector graphic representation that stores an image as a set of 2D Bezier curves with colors defined on either side. These colors are diffused over the image plane, resulting in smooth color regions as well as sharp boundaries. In this paper, we introduce a new automatic diffusion curve coloring algorithm. We start by defining a geometric heuristic for the maximum...

the purpose of this study was to investigate the brain activation patterns in response to thehuman color preference by using a functional magnetic resonance imaging (fmri). a total of 31 healthyhumans without color blindness were participated in this study. the brain activation was induced by viewingof eight different colors: black, gray, blue, green, earthy yellow, red, yellow and white. the q...