1. A method, comprising: illuminating a subject with light from a plurality of light sources, the plurality of light sources having distinct colors and configured to illuminate the subject from distinct locations, wherein the plurality of light sources includes light sources of at least two distinct colors; obtaining a multi-color image of the subject, the multi-color image comprising respective values corresponding to respective intensities of light of respective colors for each region of the subject; and determining a surface profile of the subject in accordance with the respective values corresponding to the respective intensities of light of the respective colors, wherein determining the surface profile of the subject includes: segmenting a surface of the subject into a plurality of regions; and determining an orientation of each region of at least a subset of the plurality of regions, wherein determining the orientation of each region includes comparing a first intensity of light of a first color reflected from the region and a second intensity of light of a second color reflected from the region.