1. A method for person re-identification, the method comprising: mapping color values from first and second images to first and second probability distributions over a plurality of colors, the plurality of colors in a first color space different than a second color space of the color values; calculating, with a processor, a similarity between the first and second probability distributions; determining an affinity score as a function of the similarity and a weight, the weight being a rank-boosted machine-learnt value; and identifying a person in the second image as a person in the first image, the identifying being a function of the affinity score.