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Fig. 1. Composite images of (A) non-polarized (Danaus erisimus) and (B)
polarized (Memphis chaeronia) butterfly wings. Two pattern elements
in B are polarized while none are polarized in A. The few instances where
polarization exists in A are due to wear on the wings and the shine of the
wing veins. False color imaging allowed transformation from a continuous to a
binary polarized data set. Color reference keys: blue indicates no
polarization while green, yellow, red and white indicate increased polarized
reflectance (white=complete polarization).
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