A method for determining a surface profile of subject's skin includes illuminating the subject with light from a plurality of light sources. The plurality of light sources having distinct colors is configured to illuminate the subject from distinct locations. A multi-color image of the subject is obtained. The multi-color image includes respective values corresponding to respective intensities of light of respective colors for each region of the subject. A surface profile of the subject is determined in accordance with the respective values corresponding to the respective intensities of light of the respective colors.