1. An apparatus for image retrieval, comprising: a computer configured for processing images; a memory coupled to said computer; and programming configured for retention in said memory and executable on said computer for performing operations comprising: maintaining a repository of images in an image repository; determining a color feature as a pseudo-color saturation for an input image; generating a histogram of said pseudo-color saturation; comparing said histogram of pseudo-color saturation for said input image to a histogram of pseudo-color saturation for an image within said repository of images; and retrieving images from said repository of images in response to said comparing.