1. A biometric method comprising: illuminating a purported skin site concurrently under a first optical characteristic from a first angle and under a second optical characteristic from a second angle, each optical characteristic selected to distinctly correspond to respective portions of a filter array, such that the filter array distinguishes between light of the first angle and light of the second angle by their respective optical characteristics; filtering light from the purported skin site using the filter array; and imaging the filtered light with an imager to multiplex the first and second angles in such a way that preserves optical segregation between the light from the purported skin as illuminated from the first angle and the light from the purported skin as illuminated from the second angle.