7.Perceptual color image quality measure. The Kullback-Leibler (KL) divergence is employed in this work for assessing the perceptual information in color images. For this purpose the CIE space is extensively studied and the pixels distribution of a perceptually ideal image is determined. The quality assessment of the perceptual information in a color image is obtained by means of its 3D KL divergence from the perceptually ideal image. The proposed measure is tested using various color images and pseudocolor representations.