Fig. 3.

Decomposition of natural image spectra into separate color components. An image from the RGB database (A) was decomposed into l (B), α- (C), and β- (D) contributions. Each component was visualized by first converting LMS cone activation values into lαβ values thresholded to one of two intensities, depending on whether the original value was positive or negative. To visualize the components separately, all but the component of interest were reduced to small constant levels before conversion back to LMS values.