Fig. 2. Colour picture (intensity and real colour, number of pixels = 560x736=412160) of red flowers and green leaves of Campsis radicans (trumpet vine; Bigniniaceae), as recorded with a video camera viewing upward with an elevation of 45° at sunset in the open, when the plant was in the shadow of a house and illuminated from above by light from a clear sky, half of which was visible from the site of the plant. Points 1-12, marked with white or black diamonds, have the following typical spectral and polarizational characteristics used for the calculations in Fig. 5 (Table 1): 1 and 2 = bright green, unpolarized light transmitted through a leaf; 3 and 4 = dark green, weakly polarized light reflected from a leaf; 5 and 6 = bright whitish, blue-green, highly polarized light reflected from a leaf; 7 and 8 = bright red, unpolarized light reflected from a petal; 9 and 10 = bright whitish, red, weakly polarized light reflected from a petal; 11 and 12 = bright whitish, red, medium polarized light reflected from a petal. The graphs in Fig. 3D-F represent data measured along the horizontal white line in this picture. The data measured at the pixel marked here with a white vertical bar are used for the calculations in Figs 7, 8 (Table 2).

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