The Analysis on the Perception Shift of Skin Colors Due to Simultaneous Color Contrast The human figure with skin colors is always the focus of the people watching images displayed on the display devices like LCDs. The human perception of skin colors is always influenced by surrounding colors due to simultaneous color contrast effect. This paper presents a scheme for analyzing the perception shift of some representative skin colors which are arranged to be against a set of preselected background colors. The shift in perception is quantified by the differences of gamma parameters that characterize the GOG models of the skin color surrounded by the midgray color and the skin color surrounded by a specified background color, while both skin colors give the same appearance. With the results of the analysis on the gamma deviation of the reference skin colors, a scheme for correcting skin colors has been developed such that the appearance of the skin color against any background color can be very close to that of the same skin color against the midgray color. The results of subjective experiments indicate that the proposed scheme is feasible in removing the effect simultaneous effect.

Perceptually optimal color reproduction What requirements do people place on optimal color reproduction of reallife scenes? We suggest that when people look at images containing familiar categories of objects, two primary factors shape their subjective impression of how optimal colors are reproduced: perceived naturalness and perceived colorfulness of the images. To test the model subjects were asked to evaluate the perceived naturalnessu0027, colorfulnessu0027 and qualityu0027 of images of reallife scenes. The judgments were related to statistical parameters of the color point distribution over the images in CIE 1976 (L*u*v*) color space. It was found that the perceptually optimal color reproduction can be derived from this statistic within the framework of our model. We also specify the naturalness, colorfulness and quality indices, describing the observeru0027s judgments.