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Figure 2


Fig. 2. Images of a squid (A) and a cuttlefish (B) showing the position of the arm stripes (as indicated by arrows). The differences in colors of the arm stripes are caused by differences in illumination of the animals in the photographs. (C,D) Close-up images of the squid (C) and the cuttlefish (D) arms tilted at various angles under the second illumination setup (Position 2, incident light from 45° above the horizontal). The left panels in C and D show the arm stripes in true-color images, while the right ones illustrate partial polarization values (%Pol) coded as in the key on the figure's right edge. The brightness of each color is proportional to the relative reflectance of the pixel in the original image (see Materials and methods for details of how relative reflectance values were obtained). The number at the left of each row of images indicates the tilt angle of the arm.





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