Systems and methods for determining a surface profile using a plurality of light sources

An optical system, comprising:

• a plurality of light sources for illuminating a subject, the plurality of light sources having distinct colors and configured to illuminate the subject from distinct locations;
• an optical image sensor used for 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;
• one or more processors coupled with the optical image sensor;
• and
• memory storing one or more programs for execution by the one or more processors, the one or more programs including instructions for determining a surface profile of the subject in accordance with the respective values corresponding to the respective intensities of light of the respective colors.