197925.fig.006a
(a)
197925.fig.006b
(b)
Figure 6: Comparison of nonpressed finger (a) and pressed finger (b). In the first column (from the left), there is the finger in all RGB colors, in the second one, there is only the -channel, the -channel is in the third, and the -channel is in the fourth column. The difference between average values is 11, 42 and 20 [28].